Watt-hours to Kilojoules Converter
Convert watt-hours to kilojoules instantly. Exact factor: 1 Wh = 3.6 kJ.
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Convert watt-hours to kilojoules
The exact conversion factor is 1 Wh = 3.6 kJ. Type any value and the result updates instantly; the math is shown beneath the board.
Worked by hand
Multiply the watt-hours value by 3.6 to get kilojoules.
Worked example
- Take 1 Wh
- multiply by 3.6
- the result is 3.6 kJ
How to use it
- Enter your watt-hours
- Read the kilojoules result
- Check the factor line to verify by hand
Frequently asked questions
How many kilojoules are in one watt-hours?
Exactly 3.6 kJ, by the SI/NIST definition.
How do I convert kilojoules back to watt-hours?
Divide by 3.6 — or use the full converter where both directions are one click.
Is this rounding or exact?
The factor is exact; only the displayed decimals are rounded.