kWh to Joules Converter
Convert kilowatt-hours to joules and back. Enter the energy in kWh and read the result in joules, kilojoules, or megajoules.
Calculator by Toolsloft ↗- Result
- 3600000 Joules (J)
- Conversion
- 1 Kilowatt-hours (kWh) = 3600000 Joules (J)
Convert kilowatt-hours to joules, the step you need when an electric bill or appliance rating is in kWh but a physics problem wants SI joules. Enter the kilowatt-hours and read the energy in joules, and switch the direction to go from joules back to kWh.
How this is calculated
One kilowatt-hour is one kilowatt sustained for one hour, so it equals 1000 watts times 3600 seconds, which is exactly 3,600,000 joules. The tool multiplies kWh by 3.6 million to get joules and divides for the reverse.
How to use
- Enter the energy in kilowatt-hours.
- Keep kWh to joules, or press Swap for the reverse.
- Read the result in joules.
Examples
- One kWh:
1 kWh = 3,600,000 J - Half a kWh:
0.5 kWh = 1.8 MJ
FAQ
- How many joules are in a kWh?
- Exactly 3,600,000 joules, because a kilowatt-hour is 1000 watts held for 3600 seconds.
- Why is my energy bill in kWh instead of joules?
- A joule is a very small amount of energy, so household use would run into the billions. Kilowatt-hours keep the numbers readable, which is why meters and bills use them.