How to convert watt-hours to joules
Formula: J = Wh × 3,600
Worked example: 60 Wh → 60 × 3,600 = 216,000 J
Watt-hours to joules conversion chart
| Watt-hours (Wh) | Joules (J) |
|---|---|
| 1 Wh | 3,600 J |
| 2 Wh | 7,200 J |
| 3 Wh | 10,800 J |
| 4 Wh | 14,400 J |
| 5 Wh | 18,000 J |
| 6 Wh | 21,600 J |
| 7 Wh | 25,200 J |
| 8 Wh | 28,800 J |
| 9 Wh | 32,400 J |
| 10 Wh | 36,000 J |
| 12 Wh | 43,200 J |
| 15 Wh | 54,000 J |
| 20 Wh | 72,000 J |
| 25 Wh | 90,000 J |
| 30 Wh | 108,000 J |
| 40 Wh | 144,000 J |
| 50 Wh | 180,000 J |
| 75 Wh | 270,000 J |
| 100 Wh | 360,000 J |
| 250 Wh | 900,000 J |
| 500 Wh | 1,800,000 J |
| 1,000 Wh | 3,600,000 J |
What is a watt-hour?
The watt-hour is the energy used by a one-watt device in one hour, 3,600 joules. Battery capacities of phones, laptops and power banks are often given in Wh; airlines generally allow power banks up to 100 Wh in cabin baggage.
What is a joule?
The joule is the SI unit of energy: the work done by a force of one newton over one meter, or one watt for one second. It is small; lifting an apple about one meter takes roughly one joule.