Formula
Wh to J conversion formula
Use this relationship for a direct conversion:
J = Wh x 3,600
Worked example
2 Wh = 7,200 J.
The thermochemical calorie and International Table BTU are named explicitly to avoid ambiguous legacy definitions.
Energy conversion
Convert Watt-hour to Joule
1 watt-hour (Wh) equals 3,600 joule (J). Enter any value below to convert from Wh to J.
Enter a value and choose units. Results update instantly.
1 Wh = 3,600 J
All Energy units
From 1 Wh| Unit | Value |
|---|---|
| Joule J | 3,600 |
| Kilojoule kJ | 3.6 |
| Thermochemical calorie cal | 860.4206500956 |
| Kilocalorie kcal | 0.8604206501 |
| Watt-hour Wh | 1 |
| Kilowatt-hour kWh | 0.001 |
| BTU (International Table) BTUₕᵀ | 3.4121416331 |
| Foot-pound ft·lb | 2,655.2237373982 |
| Electronvolt eV | 2.2469432668e22 |
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Quick reference
Watt-hour to Joule table
| Watt-hour (Wh) | Joule (J) |
|---|---|
| 0.01 | 36 |
| 0.1 | 360 |
| 1 | 3,600 |
| 2 | 7,200 |
| 5 | 18,000 |
| 10 | 36,000 |
| 25 | 90,000 |
| 50 | 180,000 |
| 100 | 360,000 |
| 1,000 | 3,600,000 |
From unit
About the watt-hour
The energy from one watt sustained for one hour.
Symbol: Wh
To unit
About the joule
The SI unit of energy, equal to one newton meter.
Symbol: J
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Source
Conversion standard
Definitions are checked against NIST SP 811: Energy units. Calculations use full internal precision before display rounding.
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Wh to J FAQ
How do you convert watt-hour to joule?
Use the formula J = Wh x 3,600. 1 watt-hour (Wh) equals 3,600 joule (J).
Is the Wh to J conversion exact?
Both unit definitions use exact factors. Only the displayed decimal may be rounded.