joules to Wh converter
1 joule equals 0.0002777778 watt-hours. Conversions use Wh = J × 0.000278
J → 0.0002777778 Wh
Wh = J × 0.000278
Converter
Worked examples
- 1 J = 0.0002777778 Wh
- 2 J = 0.0005555556 Wh
- 5 J = 0.0013888889 Wh
- 10 J = 0.0027777778 Wh
- 100 J = 0.02777778 Wh
joules to watt-hours conversion table
| J | Wh | Arithmetic |
|---|---|---|
| 1 J | 0.0002777778 Wh | × 0.000278 |
| 2 J | 0.0005555556 Wh | × 0.000278 |
| 3 J | 0.0008333333 Wh | × 0.000278 |
| 4 J | 0.0011111111 Wh | × 0.000278 |
| 5 J | 0.0013888889 Wh | × 0.000278 |
| 6 J | 0.0016666667 Wh | × 0.000278 |
| 8 J | 0.0022222222 Wh | × 0.000278 |
| 10 J | 0.0027777778 Wh | × 0.000278 |
| 12 J | 0.0033333333 Wh | × 0.000278 |
| 15 J | 0.0041666667 Wh | × 0.000278 |
| 20 J | 0.0055555556 Wh | × 0.000278 |
| 25 J | 0.0069444444 Wh | × 0.000278 |
| 30 J | 0.0083333333 Wh | × 0.000278 |
| 40 J | 0.01111111 Wh | × 0.000278 |
| 50 J | 0.01388889 Wh | × 0.000278 |
| 60 J | 0.01666667 Wh | × 0.000278 |
| 70 J | 0.01944444 Wh | × 0.000278 |
| 80 J | 0.02222222 Wh | × 0.000278 |
| 90 J | 0.025 Wh | × 0.000278 |
| 100 J | 0.02777778 Wh | × 0.000278 |
How to convert J to Wh
- Take your value in joules.
- Multiply by 0.000278
- That is your answer in watt-hours — no rounding needed until you choose a display precision.
Related conversions
Wh to JJ to kJJ to calJ to kcalJ to kWhJ to BtukJ to Whcal to Whkcal to Whall energy units
Questions
How many watt-hours in 1 joule?
Exactly 0.0002777778 Wh. The factor follows from the definitions of both units, not from a measurement, so it is exact.
How do I convert J to Wh?
Multiply the joules figure by 0.000278 — or use the converter above, which updates as you type.
Is J to Wh the same as Wh to J?
No — they are inverses. One J is 0.0002777778 Wh, while one Wh is 3,600 J.
What is 1 J in Wh?
1 J = 0.0002777778 Wh (see the value page for the full arithmetic).