Appliance running cost

Estimate daily, monthly, and yearly electricity costs from watts, usage hours, and your rate.

1. Enter your values in the labeled fields.
2. Results update automatically as inputs change. Review the result and assumptions.
3. Copy or print your result.

Formula and example

Daily kWh = watts ÷ 1000 × hours per day × active duty cycle / 100. Cost = kWh × your electricity rate. A 1000 W appliance running 2 hours daily at 0.15 per kWh costs 0.30 daily, 9.00 per 30-day month, and 109.50 per 365-day year.

Limits and assumptions

Use the currency of your electricity rate. Wattage is assumed constant while active; duty cycle estimates the portion of scheduled time spent running. Excludes standby usage, fixed fees, taxes, seasonal changes, and time-of-use or tiered rates. Monthly and yearly figures assume the same daily usage. All processing is local; inputs are not stored or transmitted.