Joules to Watt-hours Converter
Convert joules (J) to watt-hours (Wh) instantly. Energy conversions link food labels in kJ and kcal, SP Group bills in kWh and air-conditioner capacity in BTU.
Result
- Watt-hours
- 0.000278 Wh
How to use the joules to watt-hours converter
- Enter the joules (J).
- The results update as you type, or press Calculate.
- Read the watt-hours first, then the supporting figures below it.
Formula
Watt-hours = joules × 0.0002777778
Worked example
For example, with these inputs:
- Joules (J): 1
the calculator returns:
- Watt-hours: 0.000278 Wh
Joules to Watt-hours table
| Joules | Watt-hours |
|---|---|
| 1 J | 0.000278 Wh |
| 2 J | 0.000556 Wh |
| 5 J | 0.001389 Wh |
| 10 J | 0.002778 Wh |
| 20 J | 0.005556 Wh |
| 25 J | 0.006944 Wh |
| 50 J | 0.013889 Wh |
| 100 J | 0.027778 Wh |
| 250 J | 0.069444 Wh |
| 500 J | 0.138889 Wh |
| 1,000 J | 0.277778 Wh |
About this conversion
Energy conversions link food labels in kJ and kcal, SP Group bills in kWh and air-conditioner capacity in BTU.
Many conversion factors are exact by definition. The inch has been defined as exactly 2.54 centimetres since 1959, and the pound as exactly 0.45359237 kilograms, so conversions involving them can be as precise as you need.
A conversion table is handy for common values, but a calculator is faster and avoids interpolation errors for anything in between.
Frequently asked questions
How many watt-hours are in one joule?
1 J = 0.000278 Wh.
How do I convert J to Wh?
Watt-hours = joules × 0.0002777778.