Kilowatt-hours to Joules
Convert kilowatt-hours to joules instantly. 1 kWh = 3,600,000 J. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert kilowatt-hours to joules
To convert kilowatt-hours to joules, multiply by 3,600,000. The relationship is fixed, so the same factor works for any quantity — there is nothing to look up and nothing that changes with temperature, location or context.
J = kWh × 3,600,000
Kilowatt-hours to Joules conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Kilowatt-hours | Joules |
|---|---|
| 1 kWh | 3,600,000 J |
| 2 kWh | 7,200,000 J |
| 3 kWh | 10,800,000 J |
| 5 kWh | 18,000,000 J |
| 10 kWh | 36,000,000 J |
| 20 kWh | 72,000,000 J |
| 25 kWh | 90,000,000 J |
| 50 kWh | 180,000,000 J |
| 100 kWh | 360,000,000 J |
| 500 kWh | 1,800,000,000 J |
| 1,000 kWh | 3,600,000,000 J |
What is a kilowatt-hour?
The unit on every electricity bill: a thousand watts for one hour.
What is a joule?
The SI unit of energy: one newton-metre, or one watt for one second.
The formula
J = kWh × 3,600,000
Every result on this page comes from this formula. Nothing is rounded until the final display, so figures match a spreadsheet to the cent.
How to use the Kilowatt-hours to Joules
- Type the number of kilowatt-hours you want to convert.
- Read the result in joules straight away — there is no button to press.
- Check the table below for the values that come up most often, or reverse the conversion with the linked joules to kilowatt-hours page.
Kilowatt-hours to Joules — frequently asked questions
How many joules are in a kilowatt-hour?
One kilowatt-hour equals 3,600,000 J. J = kWh × 3,600,000
What is the formula to convert kilowatt-hours to joules?
The formula is J = kWh × 3,600,000. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert joules back to kilowatt-hours?
Divide instead of multiplying: one joule is 2.77778e-07 kWh. The reverse converter is linked in the related tools list.
Is this conversion exact?
Yes. Both units are defined against the same base unit by international agreement, so the factor is exact — any rounding you see is only in the display, which you can widen by entering more decimal places.
Is this kilowatt-hours to joules free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
What people search for
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About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 19, 2026 · Calculation runs client-side · No data collected · Report an error