Joule to Watt-hour Converter
Convertisseur d'Énergie Gratuit, Convertissez Joules, Calories, Kilowattheures et BTU Instantanément
Joule
- Symbol
- J
- System
- Metric/Imperial
- Dimension
- Various
Watt-hour
- Symbol
- Wh
- System
- Metric/Imperial
- Dimension
- Various
Quick Reference Table
| Joule | Watt-hour | Watt-hour | Joule |
|---|---|---|---|
| 1 | 0.0002777778 | 1 | 3600 |
| 2 | 0.0005555556 | 2 | 7200 |
| 3 | 0.0008333333 | 3 | 10800 |
| 5 | 0.0013888889 | 5 | 18000 |
| 10 | 0.0027777778 | 10 | 36000 |
| 25 | 0.0069444444 | 25 | 90000 |
| 50 | 0.0138888889 | 50 | 180000 |
| 100 | 0.0277777778 | 100 | 360000 |
| 500 | 0.1388888889 | 500 | 1800000 |
| 1000 | 0.2777777778 | 1000 | 3600000 |
Conversion Formula
Watt-hour = Joule × 0.0002777778
Joule = Watt-hour × 3600
Factors are from BIPM SI brochure and NIST SP 811, stored unrounded and computed via a base unit. Reverse factor is 1 ÷ 0.0002777778.
How to convert Joule to Watt-hour
Multiply the value in joule by 0.0002777778 to get watt-hour. For example, 5 Joule = 0.0013888889 Watt-hour. All results in the énergie converter update instantly as you type, so you can see every unit at once without manual math.
Common mistakes
Do not round the factor to 0.00 too early — keep full precision until the final display. For énergie, always verify critical calculations (medicine, engineering) with a second source.
FAQ
- How many Watt-hour in 1 Joule?
- 1 Joule = 0.0002777778 Watt-hour.
- How many Joule in 1 Watt-hour?
- 1 Watt-hour = 3600 Joule.
- What is the source?
- BIPM/NIST via OmniConverter base-unit engine. Source table and formula above are exact.
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