Updated 2026-11-09

Appliance running-cost calculator

Enter the watts from the label, the hours per day, and your rate. The result updates as you type.

Power in watts (printed on the appliance label) Hours used per day Your rate in $ per kWh (from your bill) Number of days

How it works

kWh = watts ÷ 1,000 × hours. Cost = kWh × rate. Many appliances do not draw full power all the time, so the result is an upper bound for devices that cycle, such as heaters with thermostats.

Example table (illustrative devices, $0.17/kWh assumption)

Device	Power	Energy/day	Cost/day
Appliance A	100 W	0.50 kWh	$0.09
Appliance B	500 W	2.00 kWh	$0.34
Appliance C	1,000 W	2.00 kWh	$0.34
Appliance D	1,500 W	12.00 kWh	$2.04

The $0.17/kWh rate is an illustrative round figure, not a published average. Replace it with the rate on your bill.