Kilocalories to Kilojoules Converter
Convert kilocalories to kilojoules instantly. Exact factor: 1 kcal = 4.184 kJ.
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Convert kilocalories to kilojoules
The exact conversion factor is 1 kcal = 4.184 kJ. Type any value and the result updates instantly; the math is shown beneath the board.
Worked by hand
Multiply the kilocalories value by 4.184 to get kilojoules.
Worked example
- Take 1 kcal
- multiply by 4.184
- the result is 4.184 kJ
How to use it
- Enter your kilocalories
- Read the kilojoules result
- Check the factor line to verify by hand
Frequently asked questions
How many kilojoules are in one kilocalories?
Exactly 4.184 kJ, by the SI/NIST definition.
How do I convert kilojoules back to kilocalories?
Divide by 4.184 — 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.