Unit Conversions

Fishing Reel Size Converter

Convert spinning reel size numbers (1000, 2500, 4000, 5000+) to target species, line weight capacity, and matching rod actions. Manufacturer-agnostic reference.

Pottery Shrinkage Converter

Convert between wet, leather-hard, bisque, and fired pottery sizes. Stoneware shrinks 10-14%, so size your wheel-thrown piece from a fired target.

Propane Tank Size Converter

Convert propane tank sizes: weight (lbs), capacity (gallons), liters, BTU and kWh energy. With tank charts to plan refills for grills, generators, and home.

Generator Power Converter

Convert generator output between watts (W), kilowatts (kW), kVA, amps (A), and horsepower (HP). Size standby, RV, and portable generators correctly.

Mower Deck Size Converter

Convert lawn mower deck width and ground speed into acres per hour, square feet per hour and total mowing time, with an efficiency factor for your lawn.

Electric Vehicle Efficiency Converter

Convert EV energy consumption between Wh/km, Wh/mile, miles per kWh, km per kWh, and MPGe. Type in any field and the others update automatically.

Running Pace Converter

Convert running pace between min/km, min/mile, km/h and mph in mm:ss format, with 5K, 10K, half and full marathon finish times.

Shirt Collar Size Converter: Inches, cm, EU, UK/US

Convert a shirt collar or neck size between inches, centimeters, EU, and UK/US sizing. Type any one and the rest update instantly.

Octane Rating Converter - RON, AKI, MON

Convert between RON (Research Octane Number), AKI pump octane (USA), and MON (Motor Octane Number) ratings for gasoline and fuel comparisons.

Wavelength Converter

Convert wavelength between nanometers, micrometers, millimeters, and meters. Gives the frequency, the photon energy in eV, and the spectrum band.

Air Density Converter

Calculate air density in kg/m³ based on altitude, temperature, and pressure. Compare density at different conditions for aviation, HVAC, and engineering.

Alcohol Dilution Calculator

Calculate how much water to add to dilute spirits to a target ABV. Enter current ABV, target ABV, and volume for instant results.

Aquarium Volume Converter

Calculate aquarium volume in gallons and liters from tank dimensions. Enter length, width, and height for instant volume calculation.

Asphalt Tonnage Calculator

Calculate how many tons of asphalt you need based on paving area dimensions and desired thickness. Covers both hot mix and cold patch asphalt.

Audio Sample Rate Converter

Convert audio sample rates and calculate bit rates from sample rate, bit depth, and channels. Enter values for instant calculations.

Baking Soda Converter

Convert between baking soda and baking powder amounts for recipe substitutions. Includes ratios for cream of tartar combinations.

Bamboo Flooring Coverage Calculator

Calculate how many bamboo flooring planks and boxes you need based on room dimensions. Includes waste factor for cuts and fitting.

Barometric Pressure Converter

Convert barometric pressure between inHg, hPa, mbar, mmHg, atm, and psi. Type in any field and the others update automatically.

Baseboard Heater Wattage Calculator

Calculate the baseboard heater wattage needed for your room based on dimensions, insulation quality, and climate zone. Covers both 120V and 240V heaters.

Bearing Number to Dimensions Converter

Convert standard bearing numbers to inner diameter, outer diameter, and width in mm and inches. Covers 6000, 6200, 6300, and 600 series ball bearings.

Beer Volume Converter

Convert between beer serving sizes including US pint, UK pint, bottles, cans, growlers, and kegs. Instantly see equivalents across all sizes.

Belt Length Calculator

Calculate V-belt and synchronous belt length from pulley diameters and center-to-center distance. Covers A, B, C, D belt profiles and metric belt standards.

Bird Seed Amount Calculator

Calculate how much bird seed you need based on feeder type, number of feeders, and season. Includes typical monthly seed weights in pounds and kilograms.

Blinds Slat Width to Light Filtering Converter

Convert window blinds slat width to estimated light filtering percentage and privacy level. Covers mini blinds, standard blinds, and faux wood blinds.

Blood Pressure Converter

Convert blood pressure readings between mmHg, kPa, and cmH2O instantly. Type in any field and the others update automatically.

Body Temperature Converter

Convert body temperature between Fahrenheit and Celsius with clinical range interpretation including normal, fever, and hypothermia zones.

Bolt Grade Converter

Look up equivalent bolt grades between metric (property class 4.6-12.9) and SAE (grade 2-8) systems. Find tensile and proof strength for any standard bolt.

Bone Density Score Converter

Interpret bone density T-scores and Z-scores from your DEXA scan. Covers WHO diagnostic thresholds for normal bone density, osteopenia, and osteoporosis.

Bread Flour Converter

Convert between all-purpose flour, bread flour, and cake flour for baking substitutions. Includes protein content differences and adjustment tips.

Brick Mortar Quantity Calculator

Calculate how much mortar you need per 1000 bricks based on brick size, joint thickness, and mortar type. Covers both metric and imperial measurements.

Brix Converter

Convert between Brix, specific gravity, and Plato for brewing, winemaking, and food science. Type in any field and the others update automatically.

Bullet Caliber Converter

Convert bullet caliber between inches and millimeters across common cartridge designations like .308 Win, 7.62mm, .45 ACP, and 9mm.

Butter Converter

Convert butter between sticks, cups, grams, ounces, and tablespoons instantly. Type in any field and the others update automatically.

Button Cell Battery Size Converter

Cross-reference CR and LR button cell battery sizes, dimensions, voltages, and equivalent part numbers from Energizer, Duracell, and other brands.

Cabinet Hinge Type Calculator

Determine the right cabinet hinge type based on door weight, overlay, and opening angle. Covers European, face frame, and inset hinges.

Cable AWG Converter

Convert between AWG wire gauge numbers, cross-sectional area in mm², diameter in inches and mm, and maximum ampacity ratings.

Calendar Converter

Convert dates between Gregorian and Julian calendars, and calculate the day of year (ordinal date). See the difference between calendar systems.

Candle Wax Calculator: Weight to Container Volume

How much wax do you need to fill a container? Convert candle wax weight in ounces or grams to volume, for soy, paraffin, beeswax, and coconut wax.

Capacitor Code Converter

Convert capacitor codes (3-digit markings) to farads, microfarads, nanofarads, and picofarads. Enter a code or value for instant conversion.

Carpet Area Converter

Convert between square feet, square yards, and square meters for flooring and carpet projects. Calculate material needed for any room.

Carpet Pad Thickness Calculator

Convert carpet pad thickness to comfort rating, durability, and recommended use. Compare foam, rubber, and fiber pad types.

Caulk Tube Size to Linear Feet Coverage Converter

Calculate how many linear feet of caulk a tube will cover based on tube size and bead width. Covers standard cartridges, squeeze tubes, and sausage packs.

Cement Mix Ratio Converter

Convert between cement, sand, and gravel ratios for different concrete and mortar applications. See recommended mixes by project type.

CFM Converter

Convert airflow between cubic feet per minute (CFM), liters per second (L/s), and cubic meters per hour (m3/h). Type in any field for instant conversion.

Chain Link Fence Gauge Calculator

Convert chain link mesh gauge numbers to wire diameter, fence strength, and recommended applications. Covers residential and commercial gauges.

Chain Pitch Converter

Look up roller chain pitch, width, and pin diameter by chain number in inches and millimeters. Complete specs for all standard ANSI roller chain sizes.

Chimney Liner Size Calculator

Determine the correct chimney flue liner size based on your appliance BTU rating, fuel type, and chimney height. Covers gas, oil, and wood appliances.

Chocolate Converter

Convert between cocoa powder, baking chocolate squares, chocolate chips, ounces and grams for baking. Enter any amount to see every equivalent.

Circuit Wire Gauge to Amp Calculator

Convert electrical wire gauge (AWG) to amperage capacity based on wire length, material, and installation method. Includes voltage drop calculations.

Climbing Rope Diameter to Strength and Weight Converter

Convert climbing rope diameter to rated impact force, weight per meter, and use category. Covers single, half, and twin ropes for climbing and mountaineering.

Clock Format Converter

Convert between 12-hour AM/PM, 24-hour, and military time formats. Type in any field to update all. Covers midnight, noon, and every hour.

Cloud Height Converter

Convert ceiling heights between feet, meters, and flight levels (FL). Covers stratus at 0-6,500 ft to cirrus above 20,000 ft for pilots and meteorologists.

Coffee Grind Size Converter

Convert coffee grind size to microns and back. Pick a brew method for its grind range, or enter a micron figure to see which methods it suits.

Coffee Measure Converter

Convert coffee between scoops, grams, tablespoons, and teaspoons instantly. Type in any field and the others update automatically.

Compost Carbon Nitrogen Ratio Calculator

Calculate the carbon to nitrogen ratio of your compost mix. Enter materials and amounts to achieve the ideal 25-30:1 C:N ratio for fast decomposition.

Concrete Cure Time Calculator

Calculate concrete curing time and strength development based on temperature, humidity, and concrete mix type. See when your concrete is safe to load.

Concrete Strength Converter

Convert concrete compressive strength between PSI, MPa, and kg/cm^2. Look up C-class and M-grade designations including C20, C25, C30, M20, M25, and M30.

Cooking Gas BTU Converter

Convert between propane and natural gas BTU ratings for cooking appliances. Calculate orifice size changes and gas consumption differences.

Cooking Oil Converter

Convert between olive oil, coconut oil, vegetable oil, and butter by weight and volume. Type in any field for instant conversions.

Copper Pipe Size Converter

Convert between copper pipe nominal sizes, actual outer diameters, wall thickness, and inner diameters for Type K, L, and M tubing.

Countertop Slab Size Calculator

Convert countertop slab dimensions to square footage and calculate how many slabs you need for your kitchen or bathroom project.

CPU Benchmark Converter

Estimate approximate FLOPS performance from CPU clock speed, core count, and operations per cycle. Compare theoretical vs real-world performance.

Crochet Hook Size Converter

Convert between US letter, metric millimeter, and old UK crochet hook sizes. Includes a complete cross-reference table for all standard hook sizes.

Curtain Rod Weight Capacity Calculator

Convert curtain rod diameter to maximum curtain weight capacity. Find the right rod size for your drapes, sheers, or blackout curtains.

Cycling Gear Inch Converter

Calculate gear inches, gain ratio, and development distance from chainring teeth, cog teeth, and wheel size for bicycle gearing.

Deck Stain Coverage Calculator

Calculate how much deck stain you need based on deck area, wood type, and stain opacity. Includes coverage rates for different wood conditions.

Diesel vs Gasoline Converter

Convert between diesel gallon equivalents (DGE), gasoline gallon equivalents (GGE), and energy content in BTU for fuel comparison.

Dimmer Switch Wattage Calculator

Calculate dimmer switch wattage rating needed for your light fixtures. Compare incandescent, LED, and CFL bulb loads on different dimmer types.

Downspout to Drain Pipe Size Calculator

Convert downspout size to underground drain pipe diameter for proper roof drainage. Calculate pipe size based on roof area and rainfall intensity.

DPI Resolution Converter

Convert between DPI (dots per inch), pixels per centimeter, and calculate total pixel dimensions for printing and display applications.

Drill Bit Speed (RPM) Calculator

Find the recommended drill speed in RPM based on bit size and material being drilled. Covers HSS, carbide, and cobalt drill bits.

Drink Caffeine Converter

Compare caffeine content across coffee, tea, energy drinks, and soda. Convert between milligrams, servings, and daily limit percentage.

Drywall Screw Size and Length Calculator

Work out the drywall screw length, gauge and thread type from board thickness and framing, plus the screw count and spacing for walls and ceilings.

Duct Size to CFM Calculator

Convert HVAC duct diameter to CFM airflow, size a duct from room area and type, or convert a rectangular duct to its equivalent round diameter.

Egg Substitute Converter

Convert whole eggs to flax egg, aquafaba, applesauce, banana, yogurt and more, matched to whether the egg is binding, lifting or adding moisture.

Electrical Conduit Fill Capacity Converter

Calculate how many wires fit in electrical conduit based on conduit size and wire gauge per NEC Chapter 9 tables. Covers EMT, IMC, PVC, and rigid conduit.

Elevation Converter

Convert elevation between feet and meters with notable mountain peak references. Type in any field and the other updates automatically.

Epoxy Resin to Hardener Mix Ratio Converter

Calculate epoxy resin to hardener mix ratios by weight and volume. Covers common 2:1, 3:1, 5:1, and 1:1 epoxy systems for coatings, adhesives, and casting.

Essential Oil Converter

Convert between essential oil drops, milliliters, and dilution percentages. Calculate safe dilution ratios for carrier oils.

Exhaust Fan CFM Calculator

Calculate the exhaust fan CFM needed for a bathroom, kitchen range hood, laundry or garage, with duct and elbow losses folded into the fan rating.

Fabric Yardage Converter

Convert fabric between yards and meters, adjust yardage for a different bolt width, and get the total area in square yards or square meters.

Felt Weight to Thickness Converter

Convert felt weight to thickness in millimeters and inches using SAE grade density, from F-1 through F-26, in either direction.

Fence Post Depth Calculator

Calculate the required fence post depth and diameter based on fence height, wind load, and soil type. Covers wood, steel, and vinyl posts.

Firewood Volume Converter

Convert firewood between full cord, face cord, rick, cubic feet and cubic meters, with the per-cord price and the heat it holds in BTU.

Fishing Line Converter: Pound Test to Diameter (Mono & Braid)

Convert fishing line pound test to diameter in inches and millimeters and back, and compare monofilament against braid at the same thickness.

Floor Joist Span Calculator

Convert floor joist size to maximum span by species, spacing and deflection limit. Covers 2x6 to 2x12 at L/360, L/480 and L/720 for tile floors.

Flour Converter

Convert flour between cups, grams, ounces, tablespoons and pounds for seven flour types, adjusted for whether the cup was scooped, spooned or sifted.

Font Size Converter

Convert font sizes between points (pt), pixels (px), em, rem, and mm for print and web design. Shows values at 96 DPI and explains em and rem scaling.

Frame Rate Converter

Convert frame rates and work out slow-motion or timelapse speed, finished clip length and frame count from your recording and playback FPS.

Furnace Filter MERV Rating Comparison

Compare furnace filter MERV ratings and their filtration capabilities. See what each rating filters and which is best for your needs.

Garage Door Spring Size Calculator

Convert garage door dimensions and weight to the correct torsion or extension spring specifications. Covers standard and custom door sizes.

Garden Hose Diameter to Flow Rate Converter

How many gallons per minute does your garden hose flow? Convert hose diameter and water pressure to flow rate in GPM and liters per minute, for 3/8 to 1 inch.

Gas Line Pipe Size Calculator

Convert gas line pipe diameter to maximum BTU delivery capacity based on pipe length and gas pressure. Covers natural gas and propane systems.

Gasket and AN Fitting Size Converter

Convert between AN fitting sizes, dash sizes, tube OD in inches and millimeters, and hose ID for automotive and aerospace plumbing.

Glass Thickness Converter

Convert glass thickness between millimeters, fractional inches, and calculate weight per square foot and square meter for common glass types.

Gold Karat Converter

Convert gold karat to millesimal fineness and purity percentage, with hallmark stamps and the melt value of the gold in a piece you weigh.

NLGI Grease Grade to Consistency Converter

Convert NLGI grease grades to worked penetration values, consistency descriptions, and typical applications. Covers grades 000 through 6.

Grommet Size Number to Hole Diameter Converter

Convert grommet and eyelet size numbers to hole diameter in inches and millimeters. Covers standard brass, stainless steel, and spur grommets.

Heat Index Converter

Convert heat index values between Fahrenheit and Celsius, and see danger levels based on temperature and relative humidity.

Heat Tape Wattage Calculator

Calculate heat tape (heat cable) wattage per foot of pipe for freeze protection. Covers self-regulating and constant wattage types for different pipe sizes.

Heat Value Converter

Convert fuel heat value between BTU/lb, kJ/kg, MJ/kg, cal/g and kWh/kg, with a reference table of common fuels from dry wood to propane.

Hose Clamp Size to Diameter Range Converter

Convert hose clamp size numbers to clamping diameter range in inches and millimeters. Covers standard worm gear, spring, and T-bolt hose clamps.

House Wrap Coverage Calculator

Calculate how many rolls of house wrap you need based on wall dimensions and overlap requirements. Covers standard and premium house wrap products.

Humidity Converter

Convert between relative humidity, dew point and absolute humidity, in Celsius or Fahrenheit. Enter the air temperature plus any one of the three.

HVAC Tonnage Converter

Convert between BTU per hour, tons of cooling, and kilowatts for HVAC and air conditioning systems. Type in any field and the others update.

Ink Viscosity Converter

Convert ink viscosity between centistokes, centipoise, Zahn cup seconds (cups 1 to 5) and Ford #4 seconds, with a warning when a cup is out of its range.

Insulation R-Value Converter

Convert between R-value (imperial) and RSI (metric) insulation ratings. Includes common material thicknesses and their R-values.

IV Drip Rate Converter

Convert between IV drip rates in drops per minute, mL per hour, and different tubing factor sizes used in nursing and medical settings.

Jeans Size Converter

Convert between US, EU, and UK jeans size systems instantly. Covers waist measurements in inches and centimeters for men and women, with brand-fit caveats.

Jewelry Chain Length Converter

Match a chain length to its style name: collar, choker, princess, matinee, opera, rope. Works for bracelets and anklets too, in inches and centimetres.

Knitting Needle Size Converter

Convert between US, metric (mm) and old UK knitting needle sizes, with the yarn weight each suits. Sizes with no equivalent are flagged, not rounded.

Lamp Brightness Converter

Convert lumens to watt equivalents for LED, CFL and incandescent bulbs, with the yearly running cost. 800 lumens replaces a 60W bulb with a 9W LED.

Lamp Shade Dimensions to Bulb Clearance Converter

Convert lamp shade top diameter, bottom diameter, and height to recommended bulb clearance, harp size, and fitting type for safe lamp assembly.

Latitude and Longitude Converter

Convert coordinates between decimal degrees and degrees-minutes-seconds, with the N/S/E/W letter handled properly so the hemisphere never gets lost.

Leather Thickness Converter

Convert leather thickness between ounces, millimetres, inches and irons, with the project each thickness suits and both competing iron definitions.

Light Color Temperature Converter

Convert Kelvin colour temperature to mireds and to a plain description of the light, and check whether two bulbs will match in the same room.

Lumber Board Foot Calculator

Calculate board feet from lumber thickness, width, and length. Convert between board feet, cubic feet, and cubic meters for lumber purchasing and estimation.

Magnetic Declination Converter

Convert between true and magnetic bearings using your local declination, with the back-bearing and a plain answer to which way to turn the dial.

Mattress Size Converter

Compare mattress sizes between US, UK, EU, and Australian standards. Shows exact width and length in both inches and centimeters for all common mattress types.

Meat Weight Converter

Convert between raw and cooked meat weight for beef, chicken, pork, and fish. Type in any field and the others update automatically.

Mesh Size Converter

Convert between mesh number, microns, and inches for particle and sieve sizing. Includes a complete reference table for standard mesh sizes.

Milk Converter

Substitute whole milk, skim, half-and-half, cream or evaporated milk in a recipe. Quantities matched on fat content, not a guessed chart.

Mortar Mix Ratio Converter

Look up cement, lime, and sand ratios for Type N, S, M, and O mortar per ASTM C270. Returns mix proportions, strength in PSI, and masonry applications.

Motor Power Converter

Convert motor power between horsepower, metric PS, kilowatts, watts and BTU per hour, with the supply draw and current once you add an efficiency.

Mulch Type to Fade Rate and Longevity Converter

Compare mulch types by colour retention and lifespan, and work out how many cubic yards or bags your beds need at the right depth for the material.

Music Interval Converter

Convert between semitones, frequency ratios, and cents for music intervals. Includes standard interval names and tuning references.

Nail Size Converter

Convert nail penny sizes (2d to 60d) to length in inches and mm with gauge and use case. Covers framing (16d = 3.5 in), finish, roofing, and brad nails.

Nut and Bolt Size Converter

Convert metric (M3-M30) to imperial bolt sizes. Returns coarse and fine thread pitch, UNC and UNF threads per inch, and the wrench that fits the hex.

Oxygen Level (SpO2) Interpreter

Interpret a SpO2 pulse oximeter reading against bands adjusted for your altitude and lung health, with the PaO2 equivalent shown.

Pasta Weight Converter

Convert between dry and cooked pasta weight in grams, ounces, and servings. Type in any field and the others update automatically.

PCB Trace Width Converter

Calculate PCB trace width needed for a given current, or find the current capacity of a trace. Based on IPC-2221 standards.

Pencil Hardness Converter

Convert between the HB graphite grading scale and the US number scale for pencils. See hardness, darkness, and common uses for each grade.

Pet Weight Converter

Convert pet weight between kilograms and pounds with breed reference ranges for dogs and cats. Type in any field for instant conversion.

Photo Aspect Ratio Converter

Calculate crop dimensions for 4:3, 16:9, 3:2, 1:1, and other common photo aspect ratios. Enter width or height to see the matching dimension.

Pipe Schedule Converter

Look up pipe schedule numbers and their wall thickness for standard pipe sizes. Select nominal pipe size and schedule for dimensions.

Plumbing Fitting Converter

Convert between NPT (National Pipe Thread) and BSP (British Standard Pipe) thread sizes. Look up thread dimensions for common pipe sizes.

Plywood Grade Converter

Look up plywood grade letters, descriptions, and standard thicknesses. Compare grades A through D and their recommended uses.

Pool Volume Calculator

Calculate swimming pool volume in gallons and liters by pool shape. Enter dimensions for rectangular, round, or oval pools.

Propane BTU Converter

Convert between propane gallons, BTU, kWh, and therms. Calculate energy content of propane for heating and appliance sizing.

Pulley Ratio Converter

Calculate pulley RPM, diameter, belt speed, and mechanical advantage ratio. Solve for any unknown in a two-pulley belt drive for motors and machinery.

PVC Pipe Schedule to Dimensions and Pressure Converter

Convert PVC pipe nominal size and schedule to outer diameter, inner diameter, wall thickness, and max pressure rating. Covers Schedule 40 and 80.

Quilt Fabric Yardage Converter

Calculate fabric yardage for a quilt top, backing, and binding by quilt size. Backing checks both seam directions and picks the cheaper one.

Rafter Length Converter

Calculate rafter length from roof pitch and run. Convert between pitch notation, degrees, and rafter length per foot of run.

Rebar Size Converter

Look up rebar sizes: diameter, area, and weight for US #3 to #18 and Canadian 10M to 55M bars, with the closest equivalent in the other system.

Refrigerant Pressure-Temperature Converter

Look up refrigerant pressure-temperature relationships for R-22, R-410A, and R-134a. Essential for HVAC diagnostics and charging.

Rice Converter

Convert between dry and cooked rice in cups, grams, and servings. Pick a type (white, brown, jasmine, basmati) for accurate cooking conversion ratios.

Rope Strength Converter

Look up rope breaking strength and working load limit by diameter and material. Covers nylon, polyester, polypropylene, manila, plus knot and splice losses.

RPM to Surface Speed Converter

Convert between RPM and surface speed (SFM, m/min) based on diameter. Enter RPM and diameter for instant surface speed calculation.

Sandpaper Grit Converter

Convert sandpaper grit to micron particle size in both standards. See where CAMI and FEPA P-grades agree and where a 400 grit is not a P400.

Screw Torque Reference

Look up recommended torque values by screw size and material. Covers metric and imperial bolts with common engineering torque specs.

Seed Germination Time Reference

Germination days for 27 vegetables: tomatoes 7-14, peppers 10-21, carrots 12-18. Set your soil temperature and see how much cold ground slows each one.

SEER Rating Converter

Convert between SEER, SEER2, EER, and COP air conditioner efficiency ratings, and see what the difference costs to run over a cooling season.

Sheet Metal Gauge Converter

Convert sheet metal gauge numbers to thickness in millimeters and inches for steel, aluminum, stainless steel, and galvanized steel.

Soil pH to Nutrient Availability Converter

See how soil pH affects nutrient availability for plants. Enter your soil pH to check which nutrients are optimally available and which may be locked out.

Solar Power Converter

Convert solar panel watts to daily and monthly kWh output based on sun hours. Enter panel wattage and sun hours for instant energy estimates.

Speaker Wattage Converter

Convert speaker wattage between RMS, peak, and PMPO ratings and estimate SPL in dB at distance. Helps match amplifier output to speaker sensitivity ratings.

Spice Converter

Convert fresh herbs to dried in teaspoons, tablespoons and grams. Per-herb ratios: 3:1 for basil and oregano, 2:1 rosemary, 12:1 ginger, 24:1 garlic.

Spring Rate Converter

Convert spring rates between pounds per inch (lb/in), Newtons per millimeter (N/mm), and kilograms per millimeter (kg/mm) for automotive and industrial springs.

Staple Size Converter

Convert common staple type designations like T50, 18 gauge, and 23 gauge to leg length and crown width in millimeters and inches.

Steel Weight Calculator

Calculate the weight of steel plates, round bars, square bars, flat bars, and tubes from dimensions in inches or millimeters. Returns weight in lbs and kg.

Stove Temperature Converter

Convert oven temperature between gas mark, Fahrenheit and Celsius, with the round dial setting and the fan-oven figure. Gas Mark 4 is 350F, 180C dial.

Sugar Converter

Convert sugar between cups, grams, ounces, teaspoons, and tablespoons instantly. Type in any field and the others update automatically.

Sugar Syrup Brix Converter

Convert Brix degrees to sugar-to-water ratios, specific gravity, and syrup type. Covers bartending, canning, baking, and confectionery sugar concentrations.

Sunscreen SPF Converter

Convert SPF ratings to UV protection percentages and calculate safe sun exposure time by skin type. Compare SPF 15, 30, 50, and 100 protection levels.

Sweetener Converter

Convert between sugar, stevia, monk fruit, erythritol, and other sweeteners. Enter sugar amount to see equivalents for each substitute.

Swimming Pool Chemical Dosing Converter

Calculate chlorine, pH adjuster, and algaecide doses for your pool volume in gallons or liters. Get precise chemical amounts for shocking and maintenance.

Tablecloth Size Converter

Calculate ideal tablecloth size from table dimensions and drop length. Returns cloth dimensions in inches and cm for rectangular, round, and square tables.

Tea Steeping Guide Converter

Find the ideal water temperature and steeping time for every type of tea, from delicate white tea to robust black tea and herbal infusions.

Thinset Mortar Coverage Converter

Calculate thinset mortar coverage area based on trowel notch size, bag weight, and tile size for floor and wall tiling projects.

Thread Size Converter

Convert between metric thread pitch (mm) and imperial TPI (threads per inch) for bolts and screws. Type in any field for instant conversion.

UTC Offsets and Time Zone Abbreviations

Look up what PST, CET, IST or JST actually mean in UTC offset terms, and see what a given offset reads as across the major zones right now.

Tire Pressure Converter

Convert tire pressure between PSI, bar, and kPa instantly. Includes recommended pressure ranges for cars, bikes, and trucks.

Trailer Tongue Weight Converter

Calculate safe trailer tongue weight range from total trailer weight using the 10-15% rule. Returns min and max tongue weight targets and hitch class limits.

Tire Tread Depth Converter

Convert tire tread depth between 32nds of an inch and millimeters. Includes wear stage indicators and replacement guidelines.

TV Size Converter

Convert TV screen diagonal to width and height in inches and cm. Covers 16:9, 4:3, and 21:9 aspect ratios for TVs, monitors, and projector screen sizing.

USB Speed Converter

Compare data transfer speeds across USB 2.0, 3.0, 3.1, 3.2, and USB4 standards. See theoretical and real-world speeds in MB/s and Gbps.

Valve Flow Coefficient Converter

Convert between Cv (US gal/min) and Kv (m³/h) valve flow coefficients for industrial valve sizing. Includes the Cv-to-Kv factor 0.865 and pipe size reference.

Varnish Coverage Converter

Calculate how much varnish or polyurethane you need based on area, number of coats, and product type. Results in gallons and liters.

Vinegar Strength Converter

Convert vinegar between acidity percentage and grain strength instantly. Type in any field and the others update automatically.

Vinyl Flooring Thickness Converter

Convert vinyl flooring thickness between mil and millimeters. Includes wear layer grade ratings and durability classifications.

Vitamin IU to mcg Converter

Convert IU to micrograms for vitamins A, D, and E. Covers retinol, beta-carotene, cholecalciferol, and both natural and synthetic vitamin E forms.

Wall Anchor Weight Capacity Converter

Find the right wall anchor type and weight capacity for drywall, concrete, brick, and hollow walls. Includes pull-out and shear load ratings.

Washing Machine Capacity Converter: Cu Ft to Load Size

Convert washing machine drum size from cubic feet to liters, load-size category, and roughly how many clothes fit. Works for top-load and front-load washers.

Water Flow Converter

Convert water flow between GPM, LPM, GPH, L/s, cubic meters per hour, and cubic feet per second. Names the fixture that runs at that rate.

Welding Rod Size to Amperage Converter

Convert welding rod electrode sizes to recommended amperage ranges for stick welding (SMAW). Covers E6010, E6013, E7018, and E7024.

Window U-Value to R-Value Converter

Convert between U-value and R-value for windows, doors, and insulated glass units. Includes both US and metric (SI) systems.

Yeast Converter

Convert between active dry yeast, instant yeast, and fresh yeast in grams and teaspoons. Type in any field and the others update automatically.

Zodiac Date Converter

Find your Western zodiac sign from birth date with exact ranges for all 12 signs. Returns element, ruling planet, and compatibility overview for each.

Age Converter

Convert any age to months, weeks, days, hours, minutes, and seconds. Find exactly how many days, hours, and minutes old you are down to the current moment.

Air Pressure Converter

Convert air and gas pressure between PSI, bar, kPa, MPa, atm, mmHg, and inHg. Covers tire inflation, barometric pressure, HVAC, and scuba tank calculations.

Alcohol Proof Converter

Convert between ABV%, US proof (2× ABV), and UK proof (1.75× ABV) for spirits and beverages. Enter any value to update all three alcohol strength units.

Altitude Converter

Convert altitude between feet, meters, and aviation flight levels. Calculate pressure altitude from QNH and field elevation for pilots and hikers.

Aspect Ratio Dimensions: 16:9, 4:3, 21:9

Start from a named ratio such as 16:9, 4:3 or 21:9, enter one pixel dimension, and get the other. Includes presets for the common video and social formats.

Baking Pan Size Converter

Find equivalent baking pan sizes when substituting round, square, and rectangular pans. Compare volumes in cups to adjust batter and baking time correctly.

Battery Capacity Converter

Convert battery capacity between mAh, Ah, Wh, and kWh at any voltage. Compare phone batteries, power banks, and EV packs and calculate runtime for any device.

Belt Size Converter

Convert belt sizes between US, EU, and UK systems and waist measurements in inches and centimeters. Includes a size chart for men and women with buying tips.

Blood Sugar Converter

Type in either box and the other fills in as you go. Converts mg/dL to mmol/L both ways, plus HbA1c to average glucose, with the fasting bands named.

Bra Size Converter

Convert bra sizes between US, UK, EU, French, Italian, Australian, and Japanese systems. Includes band and cup cross-reference charts with measuring tips.

Clothing Size Converter

Convert clothing sizes between US, UK, EU, and international systems. Covers tops, shirts, and blouses with chest and waist measurement guidance.

Compass Bearing Converter

Convert compass bearings between degrees, the 16 cardinal points, radians and NATO mils. Shows the back bearing and corrects for magnetic declination.

Concrete Volume Converter

Convert concrete volume between cubic yards, cubic meters, and cubic feet. Calculates 60-lb and 80-lb bag count for slabs, footings, columns, and steps.

Curtain Size Converter

Calculate curtain panel width and drop from window dimensions using fullness ratios. Includes rod length guidance and hem allowances for any curtain style.

Diamond Weight Converter

Convert diamond and gemstone weight between carats, points, grams, and milligrams. Includes a carat size reference from 0.25 ct to 5 carats.

Drill Bit Size Converter

Convert drill bit sizes between fractional inches, decimal inches, mm, letter (A-Z), and number gauges (1-80). Full cross-reference chart for metalworking.

Electric Bill Calculator

Calculate electricity cost from device wattage, daily hours, and kWh rate. Includes appliance presets, standby draw, and daily, monthly and yearly totals.

Fabric Weight Converter

Convert fabric weight between GSM and oz/yd2, and turn either into weight per linear yard or metre once you give the bolt width.

Fertilizer Ratio Converter

Convert NPK fertilizer ratios to actual nutrient weights and spread rates per 1,000 sq ft or acre, with the phosphate and potash oxide correction.

Fiber Optic Power Converter

Convert optical power between dBm and milliwatts for fiber optic networks. Includes reference signal levels for single-mode and multimode fiber testing.

Gold Weight Converter

Convert precious metal weight between troy ounces, grams, pennyweight, tola, baht, and grains. For jewelers, bullion dealers, and investors in gold and silver.

Grade and Slope Converter

Convert slope between percentage grade, degrees, ratio (1:x), and rise-over-run. Used for road grading, roof pitch, ramps, treadmills, and accessibility ramps.

Hardness Converter

Convert between Rockwell C (HRC), Brinell (HB) and Vickers (HV) hardness for steel, with an estimated tensile strength and the standard cross-reference table.

Hat Size Converter

Convert hat sizes between US, UK, EU, and head circumference in cm and inches. Covers baseball caps, fedoras, beanies, and formal hats.

Height Converter

Convert height between feet and inches, centimeters, and meters. Includes a reference table from 4 ft to 7 ft for the most common height conversion questions.

Image Size Converter

Convert image dimensions between pixels, inches, cm, and mm at any DPI. Add a height to get megapixels and a print-quality verdict for photos and posters.

Ink Coverage Calculator

Estimate ink and toner consumption from page coverage percentage and cartridge yield. Calculate cost per page and monthly print costs for any printer.

Light Intensity Converter

Convert light intensity between lux, foot-candles, phot and nox, with reference levels from moonlight to direct sun and the inverse-square law applied.

Linear Density Converter

Convert yarn linear density between tex, denier, dtex and kg/m, plus the cotton and metric count systems, which run backwards from the rest.

Lumber Dimensions Converter

Look up actual versus nominal lumber sizes from 1x2 to 6x6. A 2x4 really measures 1.5 by 3.5 inches, and board feet are priced on the nominal size.

Luminous Flux Converter

Convert between lumens, candela, lux, and foot-candles for lighting design and photometry. Includes point source to surface illuminance conversion formulas.

Map Scale Converter

Convert map scale ratios (1:25,000, 1:50,000, etc.) to real-world distances. Enter cm or inches to get actual ground distance in km, miles, and meters.

Mass Flow Rate Converter

Convert mass flow rate between kg/s, kg/h, g/s, lb/s, lb/h, and metric ton/h. Used in chemical engineering, HVAC, and industrial process design calculations.

Moment of Inertia Converter

Convert moment of inertia between kg·m², lb·ft², g·cm², slug·ft² and oz·in², with stored rotational energy at any speed for flywheel and motor sizing.

Nautical Converter

Convert nautical miles to kilometers and statute miles, and knots to km/h and mph. Essential for sailors, pilots, and maritime navigation planning.

Noise Exposure Calculator

Calculate occupational noise dose from dB level and duration using OSHA 90 dBA and NIOSH 85 dBA standards. Returns dose percentage and exposure time.

Paint Coverage Converter

Calculate paint needed in liters and gallons from wall area, coats, and coverage rate. Deducts doors and windows and rounds up to whole cans.

Paper Weight Converter

Convert paper weight between GSM and the US bond, text, and cover pound scales. Chart of common paper types from 75 GSM copy paper to 350 GSM cardstock.

pH Converter

Convert between pH, pOH, H+ concentration, and OH- concentration. Includes acid, neutral, and base classifications with real-world substance examples.

Print Size From Megapixels

Enter a camera's megapixel count and get the largest sharp print at 150, 300 and 600 DPI, with the viewing-distance rule that decides which one you need.

Pipe Size Converter

Convert nominal pipe size (NPS) to its metric DN equivalent and actual outside diameter in inches and millimetres, from 1/8 inch to 24 inch.

Pixel Unit Converter

Convert CSS units including px, em, rem, pt, cm, mm, and inches at any base font size. For responsive web design and translating print to screen dimensions.

Pool Chemical Dose by Product Strength

Work out chlorine, shock and algaecide doses from the percentage of active chlorine on your product label, for any pool volume in gallons or litres.

Pregnancy Weeks Converter

Convert pregnancy weeks and days to months and trimester stage. Enter LMP or conception date to calculate estimated due date and current week.

Rainfall Converter

Convert rainfall between mm, inches, liters per sq meter, and gallons per sq foot. Also calculates total water collected from a roof for any storm.

Ring Size Converter

Convert ring sizes between US, UK, EU, and Japanese systems with inner diameter in mm. Includes finger measuring instructions and a band-width allowance.

Rope Diameter Converter

Convert rope diameter between millimeters and inches with circumference calculation. Includes a size reference chart for sailing, climbing, and rigging ropes.

Salinity Converter

Convert water salinity between ppt, PSU, specific gravity, and conductivity (mS/cm). For reef aquariums, marine tanks, brewing, and oceanography calculations.

Screen Resolution Converter

Calculate pixels per inch (PPI) from screen diagonal and resolution. Compare monitors, phones, and tablets to see how Retina and 4K displays differ.

Screw Size Converter

Convert screw sizes between metric (M2-M20), imperial gauge, and thread pitch. Includes outer diameter and thread pitch reference for wood screws and bolts.

Soil Volume Converter

Convert soil volumes between cubic feet, cubic yards, cubic meters, liters, and gallons. Useful for raised beds, planters, and landscaping with bulk orders.

Speaker Impedance Calculator

Calculate total impedance for speakers wired in series, parallel, or mixed configurations. Supports 2 to 4 speakers with ohm ratings from 2 to 16 ohms.

Spray Rate Converter

Convert spray application rates between gallons per acre, liters per hectare, oz per 1000 sq ft, and mL per sq meter for pesticide and fertilizer spraying.

Stitch Gauge Converter

Convert knitting stitch gauge between stitches per inch and per 10 cm. Includes US, UK, and metric needle size conversion and row gauge adjustments.

Tire Size Converter

Decode metric tire sizes like 225/45R17 and calculate diameter, sidewall height, and circumference. Compare original and new sizes for speedometer accuracy.

TV Viewing Distance Converter

Calculate ideal TV viewing distance for any screen size at 1080p, 4K, and 8K. Enter screen diagonal to get minimum and recommended seating distance.

Water Hardness Converter

Convert water hardness between ppm, mg/L, grains per gallon, dGH, and Clark degrees. Includes a hardness scale for aquariums, brewing, and home testing.

Wind Speed and Beaufort Converter

Convert wind speed between the Beaufort scale, km/h, mph, knots, and m/s. Includes sea state and land effect descriptions for each Beaufort force level.

Wire Gauge Converter

Convert AWG wire gauge to diameter in mm and inches with cross-sectional area. Includes NEC ampacity for copper and aluminum, plus voltage drop over a run.

Yarn Weight in Tex, Denier and WPI

Convert yarn weight between tex, denier, wraps per inch (WPI), and categories from lace to super bulky. Includes recommended needle and hook sizes.

Acceleration Converter

Convert acceleration between m/s², ft/s², g-force (9.80665 m/s²), and Gal (cm/s²). Used in vehicle testing, seismology, and aerospace g-load calculations.

Angular Velocity Converter

Convert between rad/s, degrees/s, RPM, and revolutions per second instantly. Type in any field and the others update automatically.

Astronomical Distance Converter

Convert between kilometers, astronomical units, light-years, and parsecs instantly. Type in any field and the others update automatically.

Bandwidth Converter

Convert between bits/s, Kbps, Mbps, Gbps, Tbps, bytes/s, KB/s, MB/s, and GB/s instantly. Type in any field and the others update automatically.

Capacitance Converter

Convert between Farad, millifarad, microfarad, nanofarad, and picofarad instantly. Type in any field and the others update automatically.

Color Converter

Convert colors between HEX, RGB (0-255), and HSL (hue 0-360°). All fields update together. Useful for web design, CSS, and graphic design color matching.

Concentration Converter

Convert between g/L, mg/L, microg/L, kg/m3, ppm, and ppb concentration units instantly. Type any value and all other units update automatically.

Dynamic Viscosity Converter

Convert between pascal-second, millipascal-second, micropascal-second, centipoise and poise. Names the everyday fluid your value matches, air to peanut butter.

Electric Charge Converter

Convert between coulomb, millicoulomb, microcoulomb, ampere-hour and milliampere-hour, with electron count and watt-hours at any battery voltage.

Electric Current Converter

Convert between ampere, milliamp, microamp, and kiloamp instantly. Enter any value and the others auto-update. Includes a current unit quick-reference table.

Electrical Resistance Converter

Convert electrical resistance between milliohm, ohm, kilohm, megohm and gigohm, then apply Ohm's law to get the current and power at any voltage.

Force Converter

Convert force between newton, kilonewton, pound-force, kip, dyne and kilogram-force, with the mass that weight corresponds to under Earth gravity.

Frequency Converter

Convert between Hertz, kilohertz, megahertz, gigahertz, terahertz and RPM. Each value also shows its period, angular frequency and wavelength.

Fuel Efficiency Converter

Convert fuel efficiency between km/L, L/100km, mpg (US), and mpg (UK). Lower L/100km and higher mpg mean better economy. Enter any value to convert.

Illuminance Converter

Convert between lux, kilolux, foot-candle, and phot, plus lumens for a room area. Direct midday sun measures about 100,000 lux, an office desk 300-500.

Inductance Converter

Convert between henry, millihenry, microhenry, and nanohenry, then add a frequency to get the inductive reactance in ohms from XL = 2 pi f L.

Kinematic Viscosity Converter

Convert kinematic viscosity between sq m/s, mm2/s, centistokes and stokes, with the ISO VG grade and the centipoise figure for a given specific gravity.

Luminance Converter

Convert between candela per square meter, nit, foot-lambert, and lambert instantly. Type in any field and the others update automatically.

Magnetic Field Converter

Convert between Tesla, millitesla, microtesla, Gauss, and kilogauss instantly. Type in any field and the others update automatically.

Magnetic Flux Converter

Convert between Weber, milliweber, microweber, Maxwell, and kilomaxwell instantly. Type in any field and the others update automatically.

Binary, Octal, Decimal and Hex Converter

Type into any of the four fields and the other three update as you go. For bases outside binary, octal, decimal and hex, use the any-base converter instead.

Paper Size Converter

Paper dimensions for A0-A8, B4, B5, Letter, Legal, Tabloid and C-series envelopes in mm, cm and inches, plus sheet weight from GSM.

Radiation Dose Converter

Convert between Sievert, millisievert, microsievert, rem, and millirem instantly. Type in any field and the others update automatically.

Radioactivity Converter

Convert between Becquerel, kilobecquerel, megabecquerel, Curie, and millicurie instantly. Type in any field and the others update automatically.

Shoe Size Converter

Convert between US men, US women, EU, UK, and cm foot length shoe sizes instantly. Type in any field and the others update automatically.

Sound Level Converter

Convert decibels to power ratio and amplitude ratio, combine two sound sources, and check safe exposure time. Explains why 10 log and 20 log differ.

Specific Heat Converter

Convert between J/(kg·K), kJ/(kg·K), cal/(g·°C), and BTU/(lb·°F) instantly. Type in any field and the others update automatically.

Surface Tension Converter

Convert surface tension between N/m, mN/m, dyne/cm, and lbf/ft. Water is 72.8 mN/m. Used in fluid mechanics, detergent work, and coating applications.

Thermal Conductivity Converter

Convert between W/(m·K), kW/(m·K), BTU/(ft·h·°F), and cal/(cm·s·°C) instantly. Type in any field and the others update automatically.

Typography Converter

Convert between points, pixels (96dpi), millimeters, inches, picas, and ems (16px) instantly. Type in any field and the others update automatically.

Voltage Converter

Convert between microvolt, millivolt, volt, kilovolt, and megavolt. Shows the AC peak voltage, the arc distance in air, and what sits at that level.

Angle Converter

Convert degrees, radians, gradians, turns, arcminutes and arcseconds, with degrees-minutes-seconds output. A full circle is 360°, or 2π radians.

Area Converter

Convert between mm², cm², m², km², in², ft², yd², mi², acres, and hectares instantly. Type in any field and the others update automatically.

Cooking Unit Converter

Convert between cups, tablespoons, teaspoons, milliliters, fluid ounces, and liters instantly. Type in any field and the others update automatically.

Currency Converter

Convert between USD, EUR, GBP, JPY, INR, AUD, CAD and CHF, and see what a bank or airport spread really costs you on top of the mid-market rate.

Data Size Converter

Convert digital storage between bytes, KB, MB, GB, TB and PB, with the binary KiB and GiB equivalents that explain why a 1 TB drive shows up as 931 GB.

Density Converter

Convert density between kg/m³, g/cm³, g/mL, lb/ft³, and lb/gal. Water is 1 g/cm³ and aluminum is 2.7 g/cm³. Used in material science and fluid dynamics.

Energy Converter

Convert between joules, kilojoules, calories, kcal, watt-hours, kWh, BTU and therms. Enter any energy value and every other unit updates at once.

Flow Rate Converter

Convert flow rates between US and Imperial GPM, litres per minute and second, cubic metres per hour, CFM and gallons per hour, for plumbing and HVAC.

Length Converter

Convert between millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles instantly. Type in any field and the others update automatically.

Power Converter

Convert between watts, kilowatts, megawatts, horsepower, and BTU per hour instantly. Enter any value to update all other units with a power reference table.

Pressure Converter

Convert pressure between Pa, kPa, bar, psi, atm, mmHg, millibar and inHg. 1 atm = 101.325 kPa = 14.696 psi = 760 mmHg, with gauge and absolute both shown.

Speed Converter

Convert speed between m/s, km/h, mph, knots and ft/s, with running pace in min/km and min/mile and the Mach number alongside every result.

Temperature Converter

Convert temperature between Celsius, Fahrenheit, and Kelvin. Body temp is 37°C = 98.6°F, boiling is 100°C = 212°F, and absolute zero is −273.15°C.

Time Converter

Convert between seconds, minutes, hours, days, weeks, months, and years instantly. Type in any field and the others update automatically.

Torque Converter

Convert between Newton-meters (Nm), foot-pounds (ft-lbs), kilogram-force meters (kgf-m), and inch-pounds (in-lbs) instantly.

Volume Converter

Convert between mL, L, m³, teaspoons, cups, pints, quarts, and gallons. Lists US and Imperial units separately, since a UK gallon is 20% larger.

Weight Converter

Convert between milligrams, grams, kilograms, tonnes, ounces, troy ounces, pounds, and stones. Shows stone-and-pounds form and everyday comparisons.

Aquarium Salinity Converter

Convert between aquarium salinity units including specific gravity, PPT (parts per thousand), PSU, and conductivity. Type in any field.

Candle Fragrance Load Converter

Convert candle fragrance oil amounts between percentages, ounces, grams, and milliliters based on wax weight. Type in any field.

Embroidery Thread Weight Converter

Convert embroidery thread weight between weight number, denier, tex and dtex, with a strand count for stranded floss and the nearest standard thread size.

Nautical Speed Converter

Convert between knots, miles per hour, kilometers per hour, and meters per second for nautical and marine speed. Type in any field.

Pottery Clay Weight Converter

Convert pottery clay weight between ounces, pounds, kilograms, and grams. Updates all fields for centering, throwing, and hand-building projects.

Resin Mix Ratio Converter

Convert between resin and hardener mix ratios by weight and volume. Supports common epoxy ratios like 1:1, 2:1, 3:1, and 5:1.

Soap Lye Concentration Converter

Convert soap lye solution concentration between percent and water-to-lye ratio, and calculate exact NaOH and water amounts for any batch size.

Telescope Magnification Converter

Convert between telescope focal length, eyepiece focal length, magnification power, and exit pupil size. Type in any field.

Cholesterol Level Converter

Convert total cholesterol, LDL, HDL, and triglycerides between mg/dL and mmol/L. With reference ranges for desirable, borderline, and high levels.

Electric Conductance Converter

Convert electric conductance between siemens, millisiemens, microsiemens, nanosiemens, picosiemens and mho, and read the matching resistance in ohms.

Food Energy Converter

Convert food energy between kcal, kJ, food Calories, lowercase calories, BTU and watt-hours, for nutrition labels and fitness tracking.

Heat Flux Converter

Convert heat flux between W/m2, kW/m2, W/cm2, BTU/hr/ft2, kcal/hr/m2 and cal/s/cm2, for thermal engineering, fire safety and building insulation.

Oven Temperature Converter

Convert oven temperatures between Fahrenheit, Celsius, Gas Mark, and fan-forced convection. Includes a baking temperature reference table from 250F to 500F.

Specific Energy Converter

Convert specific energy between J/kg, kJ/kg, MJ/kg, kWh/kg, BTU/lb, and kcal/kg. Used in fuel energy density, battery capacity, and thermodynamics calculations.

Typing Speed Converter

Convert typing speed between WPM, CPM, keystrokes per hour, and characters per second. Used for data entry benchmarking and typing test score comparisons.