Compare energy cost per load on the same cycle
Cycle hours equal the entered cycle time converted to hours. Electric-dryer energy per load equals electric power multiplied by cycle hours. A gas dryer has two energy costs: its electric power multiplied by cycle hours, plus its burner rating multiplied by cycle hours and the matching natural-gas price.
Keep electrical and gas energy units separate
Electricity is priced per kilowatt-hour. Natural gas can be priced per therm or per kilowatt-hour of gas energy; one therm is 100,000 BTU or about 29.300111 kWh. A burner rating entered in BTU per hour is converted to kilowatts before its energy per load is calculated.
Treat operating cost as one part of the dryer decision
Actual cycle duration and power draw vary with load size, moisture, sensor settings, vent condition, appliance efficiency, standby use, and utility tariffs. Purchase price, installation, gas-line or vent work, maintenance, rebates, demand charges, and emissions are outside this operating-cost estimate.