Joules to Watt-hours
Convert J to Wh. 1 joule = 0.000277777778 Wh, and 1 watt-hour = 3,600 J.
Formula Divide the value in joules by 3,600. Joules to Watt-hours table
1 joule in every unit
| Kilojoules | 0.001 | kJ |
|---|---|---|
| Megajoules | 0.000001 | MJ |
| Calories | 0.239005736138 | cal |
| Kilocalories | 0.000239005736 | kcal |
| Watt-hours | 0.000277777778 | Wh |
| Kilowatt-hours | 0.000000277778 | kWh |
| British thermal units | 0.00094781712 | BTU |
| Foot-pounds | 0.737562149277 | ft·lbf |
| Electronvolts | 6.241509e+18 | eV |
Food labels write kilocalories (kcal) as "Calories". Calories here are thermochemical: 1 cal = 4.184 J.
How to convert joules to watt-hours
Divide the value in joules by 3,600.
For example, 10 J = 0.002777777778 Wh, and 10 Wh = 36,000 J.
Frequently asked questions
How many watt-hours are in one joule?
1 joule = 0.000277777778 Wh.
What is 10 J in Wh?
10 J = 0.002777777778 Wh.
How do I convert Wh back to J?
Multiply the value in watt-hours by 3,600. 1 watt-hour = 3,600 J.
Joules to Watt-hours table
| Joules (J) | Watt-hours (Wh) |
|---|---|
| 0.1 | 0.000027777778 |
| 0.5 | 0.000138888889 |
| 1 | 0.000277777778 |
| 2 | 0.000555555556 |
| 3 | 0.000833333333 |
| 4 | 0.001111111111 |
| 5 | 0.001388888889 |
| 6 | 0.001666666667 |
| 7 | 0.001944444444 |
| 8 | 0.002222222222 |
| 9 | 0.0025 |
| 10 | 0.002777777778 |
| 15 | 0.004166666667 |
| 20 | 0.005555555556 |
| 25 | 0.006944444444 |
| 30 | 0.008333333333 |
| 50 | 0.013888888889 |
| 75 | 0.020833333333 |
| 100 | 0.027777777778 |
| 250 | 0.069444444444 |
| 500 | 0.138888888889 |
| 1,000 | 0.277777777778 |
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