Converters
12
Joules to Watt-hours Converter
Convert joules to watt-hours instantly with the formula, worked examples, rounding guidance, and related energy conversions.
Units
85
Mode
Live
Pair-specific conversion guide
Joule to Watt-hour formula
Use this Joule to Watt-hour page for direct energy conversions. The calculator keeps the exact J to Wh relationship on the page, so the result, formula, and examples all describe this specific pair.
Formula model
1 J = 0.000277777777778 Wh
1 Joule equals
Quick factor: 1 J = 0.000277777777778 Wh.
The current calculator value is 1 J, which equals 0.000277777777778 Wh.
Use the conversion table to compare 1 J with the other units in the same category.
Energy units can describe electricity, heat, or nutrition, so retain the unit symbol with every result.
Precision and rounding
The calculation uses the catalog's fixed conversion factors between J and Wh. Full decimal precision is kept for the calculation; only the displayed value is rounded for readability.
Reference: NIST conversion factorsEnergy
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Watt-hours to Joules Converter
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Conversion table
1 Joule equals
| Unit | Value |
|---|---|
| Kilojoule kJ | 0.001 |
| Calorie cal | 0.239005736138 |
| Kilocalorie kcal | 0.000239005736138 |
| Watt-hour Wh | 0.000277777777778 |
| Kilowatt-hour kWh | 2.77777777778E-07 |
| British thermal unit BTU | 0.000947817120313 |
FAQ
Joule to Watt-hour questions
How do you convert Joule to Watt-hour?
Use the formula 1 J = 0.000277777777778 Wh. As a quick check, 1 J equals 0.000277777777778 Wh.
Is the Joule to Watt-hour conversion exact?
This page uses fixed constants from the Converter Science catalog. Displayed results are rounded only to keep the page readable.