Joules to Watt-hours
Convert joules to watt-hours for batteries, electricity use, energy storage, and one watt for one hour calculations.
How to convert J to Wh
To convert a value from joules (J) to watt-hours (Wh), enter the number in the converter above. Use the swap control if you need the reverse direction.
x is the source value in J; y is the result in Wh.
Popular conversions
Quick answers for common J to Wh values are available from the related conversion pages.
Use the related tools section for fixed-value conversions and the reverse direction.
Common conversion table
Quick reference table for common J to Wh values:
| J | Wh |
|---|---|
| 1 | 0.000278 |
| 5 | 0.001389 |
| 10 | 0.002778 |
| 50 | 0.013889 |
| 100 | 0.027778 |
| 1,000 | 0.277778 |
About joules
Joule (J) — The joule is the SI derived unit of energy. One joule is one watt-second.
Common uses: Joules are used in physics, chemistry, engineering, mechanics, heat energy, and SI energy specifications.
About watt-hours
Watt-hour (Wh) — One watt-hour is exactly 3,600 joules: one watt of power sustained for one hour.
Common uses: Watt-hours are used for batteries, electricity consumption, energy storage, portable electronics, and appliance energy estimates.
Frequently Asked Questions
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