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kWh Calculator
Convert watts and hours of use into kilowatt-hours (kWh) per day, month and year, for one or several identical devices.
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How to use it
- Enter the device wattage.
- Enter hours of use per day and how many identical devices.
- Read kWh per day, month and year.
How it works
kWh per day = watts × hours × devices ÷ 1,000. Month = day × 30.4; year = day × 365. Your bill shows your total kWh per billing period - compare it with these figures to find the big users.
FAQ
How many kWh does a house use per month?
The average US home uses roughly 850-900 kWh per month (EIA), with large variation by climate, size and heating type.
How many watts is 1 kWh?
1 kWh is the energy of 1,000 watts for one hour - or 100 W for 10 hours.
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Free calculator by KWhCalc