Joules to Watt-hours
Convert joules to watt-hours (J to Wh). 1 J = 0.000277777777778 Wh. Use the calculator, formula and conversion table.
How to convert joules to watt-hours
Multiply the amount in joules by 0.000277777777778 to get watt-hours. The displayed factor and results are rounded to 12 significant digits.
Wh = J × 0.000277777777778Worked example
1 J = 0.000277777777778 Wh. Change the amount in the calculator above to use your own value.
Units and assumptions
A watt-hour is 3,600 joules. Calories use the thermochemical definition (4.184 J); BTU uses the International Table definition.
Calculator results use floating-point arithmetic and are rounded for display. The reference table below uses up to 12 significant digits.
Joules to Watt-hours table
| Joules (J) | Watt-hours (Wh) |
|---|---|
| 0 | 0 |
| 1 | 0.000277777777778 |
| 5 | 0.00138888888889 |
| 10 | 0.00277777777778 |
| 25 | 0.00694444444444 |
| 100 | 0.0277777777778 |
| 1,000 | 0.277777777778 |
About this conversion
What is the formula for joules to watt-hours?
Wh = J × 0.000277777777778. Multiply the amount in joules by 0.000277777777778 to get watt-hours. The displayed factor and results are rounded to 12 significant digits.
How do I convert back to joules?
Use the watt-hours to joules calculator to reverse this conversion. You can also use Swap units in the calculator above.
Can I use a different pair of units?
Choose another unit in the calculator, or open the energy converter to browse all supported pairs.