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Joule to Watt hour
Convert Joule to Watt hour and get the exact value instantly.
1 J = 0.0002777777778 Wh
About this conversion
To convert Joule to Watt hour, multiply the number of Joule by 0.0002777777778.
Energy shows up as joules, calories, kilowatt-hours or BTU depending on the field (nutrition, an electricity bill, heating or physics), so a conversion makes the numbers comparable.
Conversion table
| Joule (J) | Watt hour (Wh) |
|---|---|
| 1 J | 0.0002777777778 Wh |
| 2 J | 0.0005555555556 Wh |
| 5 J | 0.001388888889 Wh |
| 10 J | 0.002777777778 Wh |
| 100 J | 0.02777777778 Wh |
How to use this converter
- Enter your Joule value
Type any number into the Joule field. It starts at 1 so you can read the rate straight away.
- Read the Watt hour result
The amount in Watt hour updates as you type, so there is no button to press and nothing to wait for.
- Swap or keep exploring
Use the swap control to flip the direction, or pick a related conversion from the list below.
Frequently asked
- How many Watt hour are in one Joule?
- One Joule equals 0.0002777777778 Wh. Enter any amount above to get an exact figure for your own value.
- Is this converter accurate?
- Yes. It uses the exact international definition of each unit and computes on your device, so the only rounding is for display.
- Do you upload the numbers I enter?
- No. The Joule to Watt hour conversion runs entirely in your browser tab, and nothing you type is sent to a server.
- Does it work on my phone?
- Yes. It runs in any modern mobile browser and keeps working offline once the page has loaded.
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