Electricity Usage Calculator
Find out how many kWh something uses from its wattage and how long it runs. Add your price to see the cost too.
Work out your electricity usage
watts (W)
1,000 W = 1 kW
hours
days
p per kWh
Example rate — enter your own.
Estimated electricity used
2 kWhper day (average)
About £0.50 per day at your price.
kWh per week14 kWh£3.50
kWh per month60.8 kWh£15.21
kWh per year730 kWh£182.50
Daily figures are averaged across the week. Real consumption varies with settings and use.
Watts to kWh
kWh = watts ÷ 1,000 × hours used
Example: a 1,000 W appliance used for 2 hours a day uses 2 kWh a day, around 60.8 kWh a month and 730 kWh a year.
Why it's useful
Knowing kWh lets you compare appliances fairly and understand which ones make up most of your bill.