Formula
Wh to kJ conversion formula
Use this relationship for a direct conversion:
kJ = Wh x 3.6
Worked example
2 Wh = 7.2 kJ.
The thermochemical calorie and International Table BTU are named explicitly to avoid ambiguous legacy definitions.
Energy conversion
Convert Watt-hour to Kilojoule
1 watt-hour (Wh) equals 3.6 kilojoule (kJ). Enter any value below to convert from Wh to kJ.
Enter a value and choose units. Results update instantly.
1 Wh = 3.6 kJ
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 |
Recent conversions
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Quick reference
Watt-hour to Kilojoule table
| Watt-hour (Wh) | Kilojoule (kJ) |
|---|---|
| 0.01 | 0.036 |
| 0.1 | 0.36 |
| 1 | 3.6 |
| 2 | 7.2 |
| 5 | 18 |
| 10 | 36 |
| 25 | 90 |
| 50 | 180 |
| 100 | 360 |
| 1,000 | 3,600 |
From unit
About the watt-hour
The energy from one watt sustained for one hour.
Symbol: Wh
To unit
About the kilojoule
One thousand joules.
Symbol: kJ
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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 kJ FAQ
How do you convert watt-hour to kilojoule?
Use the formula kJ = Wh x 3.6. 1 watt-hour (Wh) equals 3.6 kilojoule (kJ).
Is the Wh to kJ conversion exact?
Both unit definitions use exact factors. Only the displayed decimal may be rounded.