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Kilocalorie to Kilojoule

Convert kilocalorie (kcal) to kilojoule (kJ) — with the exact factor, a quick-reference table and a free converter that works offline.

1 kcal = 4.184 kJ

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Conversion table

Kilocalorie (kcal)Kilojoule (kJ)
1 kcal4.184 kJ
2 kcal8.368 kJ
5 kcal20.92 kJ
10 kcal41.84 kJ
20 kcal83.68 kJ
50 kcal209.2 kJ
100 kcal418.4 kJ
500 kcal2,092 kJ

How the conversion works

Both units measure energy. One kilocalorie equals exactly 4.184 kJ, so multiply by that factor to convert. Food 'Calorie'.

FAQ

How many kilojoules in a kilocalorie?

1 kcal = 4.184 kJ.

How do I convert kilocalorie to kilojoule?

Multiply the kilocalorie value by 4.184. For example, 10 kcal × 4.184 = 41.84 kJ.

Where does the factor come from?

The conversion factor is defined in NIST SP 811; both units are energy units converted through joule.

Related conversions

Kilojoule to Kilocalorie Calorie to Joule Joule to Calorie Kilowatt-hour to British thermal unit

Conversion factors: NIST SP 811. Computed by the same engine that powers the app.

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