Dryer Load Time Calculator

Clothes dryer time and energy cost calculations combine the physics of moisture removal with the economics of electricity consumption. Knowing both helps you optimize load size, temperature settings, and run time to reduce energy bills.

Energy consumption formula: Energy Used (kWh) = Dryer Wattage × Run Time (hours) ÷ 1,000

Cost per cycle: Cost per Cycle = Energy Used (kWh) × Electricity Rate ($/kWh)

Monthly and annual cost: Monthly Cost = Cost per Cycle × Cycles per Week × 4.33

Where:

• Dryer Wattage: electric dryers: 4,000–6,000W (typically ~5,600W at high heat); gas dryers: 700W electric (plus gas cost ~$0.25–$0.50/cycle)
• Run Time: varies by load size and moisture content; typical: 45–60 minutes for a normal load
• Electricity Rate: US average $0.13–$0.16/kWh; varies significantly by state (Hawaii $0.33/kWh; Louisiana $0.11/kWh)
• Cycles per Week: average US household: 5–7 loads per week

What each variable means:

• Sensor vs. timed drying: sensor dryers detect moisture and stop automatically, saving 15–30% energy vs. timed cycles
• Load size: an oversized load takes 30–50% longer and uses proportionally more energy; undersized loads waste energy per item dried
• Fabric type: cotton takes longest; synthetics dry faster; delicates use low heat and longer time

Reference: dryer efficiency by type:

• Standard electric dryer: 4,000–6,000W, ~$0.30–$0.50/cycle
• Gas dryer: $0.15–$0.25/cycle (energy equivalent, gas is cheaper)
• Ventless heat pump dryer: 800–1,500W, $0.10–$0.25/cycle, and roughly 70% less electricity than a vented electric dryer on the same load

Worked example: A full drum of cotton off a normal spin, which the calculator puts at 57 minutes. Electric dryer: 5,500W. Electricity rate: $0.14/kWh. 6 loads per week.

• Energy per cycle = 5,500 × (57÷60) ÷ 1,000 = 5,500 × 0.95 ÷ 1,000 = 5.225 kWh, shown as 5.22
• Cost per cycle = 5.225 × $0.14 = $0.73
• Weekly cost = $0.73 × 6 = $4.39
• Monthly cost = $4.39 × 4.33 = $19.00
• Annual cost = $228

Pick Large, Cotton and Medium above, enter 5500, 0.14 and 6, and those are the figures that come back.

A ventless heat pump dryer running the same load takes about 77 minutes but draws only 1,200W, so it uses 1.54 kWh and costs $0.22 a cycle. That is 71% less electricity, and $161 a year at six loads a week. The premium over a conventional dryer usually pays back in three to five years, sooner if you run more loads or your rate is above average.