Joules to Watt-hours (J to Wh)
Free online joule to watt-hour converter. Type a value, get an instant exact result — plus the formula, a ready-made conversion table, and reverse conversion.
ENERGY CONVERTER — INSTANT RESULT
Formula: multiply the joule value by 0.00027777778 — i.e. Wh = J × 0.00027777778
Quick check: 1 J = 0.00027777778 Wh
Quick check: 1 J = 0.00027777778 Wh
Joules to Watt-hours conversion table
| Joules (J) | Watt-hours (Wh) |
|---|---|
| 1 J | 0.00027777778 Wh |
| 2 J | 0.00055555556 Wh |
| 3 J | 0.00083333333 Wh |
| 4 J | 0.0011111111 Wh |
| 5 J | 0.0013888889 Wh |
| 6 J | 0.0016666667 Wh |
| 7 J | 0.0019444444 Wh |
| 8 J | 0.0022222222 Wh |
| 9 J | 0.0025 Wh |
| 10 J | 0.0027777778 Wh |
| 15 J | 0.0041666667 Wh |
| 20 J | 0.0055555556 Wh |
| 25 J | 0.0069444444 Wh |
| 30 J | 0.0083333333 Wh |
| 40 J | 0.011111111 Wh |
| 50 J | 0.013888889 Wh |
| 75 J | 0.020833333 Wh |
| 100 J | 0.027777778 Wh |
| 250 J | 0.069444444 Wh |
| 500 J | 0.13888889 Wh |
| 1,000 J | 0.27777778 Wh |
How to convert joules to watt-hours
To convert joules to watt-hours, multiply the amount in joules by 0.00027777778. For example, 10 J = 0.0027777778 Wh. To convert in the other direction, divide by the same factor, or use the ⇄ swap button above.
Convert between joules, calories, BTU, kilowatt-hours and foot-pounds. The joule is the SI unit of energy; the thermochemical calorie is defined as exactly 4.184 J.
Frequently asked questions
How many watt-hours are in one joule?
One joule is exactly 0.00027777778 watt-hours.
How do I convert J to Wh?
Multiply the J value by 0.00027777778 to get Wh. The converter at the top of this page does this automatically and works in both directions.
How much is 100 joules in watt-hours?
100 joules equals 0.027777778 watt-hours.