Surfing Calculators
Free surfing calculators: surfboard volume for your skill level, wetsuit thickness by water temp, wave height converter, and trip tools.
Board volume, wetsuit thickness, swell timing and wave size. 8 calculators for surfers. Swell and wind forecasting sits under Weather.
Wave period is the number that separates a good forecast from a wasted drive, and it hides a trap. In deep water, speed scales with the period while wavelength scales with the square of it, so doubling the period makes waves twice as fast and four times as far apart. A swell also has two speeds. Individual crests travel at the phase speed, but the group moves at half that in deep water, and the group is what carries the energy. Forecasters use the slower figure. Mix them up and you arrive hours early.
Wetsuit thickness goes by water temperature, never air. Water pulls heat out of you roughly 25 times faster than air at the same temperature, which is why a bright day over 12°C water still calls for a 4/3 and boots.
Sessions past two hours want the next warmer suit. Being tired makes you cold.
Swell Travel Time Calculator
Work out when a swell reaches your surf spot from the period and storm distance. Gives group speed, travel time, and the arrival date and hour.
Surf Session Calorie Burn Calculator
Estimate calories burned surfing by body weight, session length, and wave intensity. Breaks down energy use across paddling, active surfing, and lineup rest.
Surfboard Wax Quantity Calculator
Calculate how much surfboard wax you need by board size and water temperature. Get bars per session and recommended wax temperature for grippy traction.
Surfboard Fin Size Guide Calculator
Find the right surfboard fin size for your weight, surf style, and board type. Get base, height, and rake recommendations for single, thruster, and quad setups.
Surf Leash Length Calculator
Find the correct surf leash length for your board size and wave conditions. A properly sized leash keeps you safe and prevents your board from hitting others.
Wave Face Height Calculator
Convert swell height to wave face height using the Hawaiian scale and local buoy reports. Understand what surf reports actually mean in real wave size.
Wave Period and Speed Calculator
Get phase speed, group speed, wavelength and breaking depth from a swell period. Shows why forecasters use the slower of the two wave speeds.
Wetsuit Thickness Calculator
Find the right wetsuit thickness for any water temperature. Avoid being too cold or too hot in the water with the right neoprene choice.