Kilowatt-hours to Joules Converter
Convert kilowatt-hours to joules instantly. 1 kWh = 3,600,000 J. Free two-way converter with the formula and a quick reference table.
How to convert kilowatt-hours to joules
joules = kilowatt-hours × 3,600,000
One kilowatt-hour equals 3,600,000 joules, so to convert kilowatt-hours to joules you multiply by 3,600,000. Going the other way, one joule is 2.7778e-7 kilowatt-hours. Both units measure energy, so the conversion is an exact ratio that never changes.
10 kilowatt-hours = 36,000,000 joules. Multiply your kilowatt-hour figure by the factor above (or just type it into the box) to convert any amount.
kilowatt-hours to joules table
| kilowatt-hours (kWh) | joules (J) |
|---|---|
| 1 | 3,600,000 |
| 2 | 7,200,000 |
| 3 | 10,800,000 |
| 5 | 18,000,000 |
| 10 | 36,000,000 |
| 20 | 72,000,000 |
| 25 | 90,000,000 |
| 50 | 180,000,000 |
| 100 | 360,000,000 |
| 250 | 900,000,000 |
| 500 | 1.8000e+9 |
| 1,000 | 3.6000e+9 |
Frequently asked questions
How many joules are in a kilowatt-hour?
One kilowatt-hour equals 3,600,000 joules. So to convert, multiply the number of kilowatt-hours by 3,600,000.
How do I convert kilowatt-hours to joules?
Multiply by 3,600,000, or simply enter the value in the converter above — it does the math instantly and works both ways.
Is this conversion exact?
Yes — both units measure the same quantity, so the ratio is fixed and this uses the standard internationally-agreed factor.