Power Consumption Calculator

Calculate electricity usage in kWh and cost for any device based on wattage and hours.

Quick presets

Daily

0.800 kWh

$0.12

Weekly

5.60 kWh

$0.84

Monthly

24.00 kWh

$3.60

Yearly

292.0 kWh

$43.80

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How it works

Enter the device's power rating in watts and the number of hours it runs per day. The tool computes energy use in kilowatt-hours (kWh) for daily, weekly, monthly (30 days), and yearly periods. Enter your electricity rate (cents per kWh) to get the corresponding cost. The global average is around 15–20 cents/kWh but varies widely by region and tariff.


              Energy (kWh) = Watts × Hours ÷ 1000

Common use cases

  • Estimating the monthly cost of running a new appliance before buying it.
  • Identifying which devices contribute most to a high electricity bill.
  • Comparing the running cost of two appliances with different wattage ratings.

Frequently asked questions

Where do I find the wattage of my device?

Check the label on the device (usually on the back or bottom), the product manual, or the manufacturer's website. For devices with variable load (computers, washing machines), use the maximum or typical wattage.

What is the average electricity rate?

Rates vary widely: the US average is about 13–16 cents/kWh, UK around 28 pence/kWh, Australia 25–30 cents/kWh. Check your electricity bill for your actual rate.