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Calorie to Joule

Convert calorie (cal) to joule (J) — with the exact factor, a quick-reference table and a free converter that works offline.

1 cal = 4.184 J

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Open the free converter with this conversion pre-loaded — no sign-up, works offline after first load.

Conversion table

Calorie (cal)Joule (J)
1 cal4.184 J
2 cal8.368 J
5 cal20.92 J
10 cal41.84 J
20 cal83.68 J
50 cal209.2 J
100 cal418.4 J
500 cal2,092 J

How the conversion works

Both units measure energy. One calorie equals exactly 4.184 J, so multiply by that factor to convert.

FAQ

How many joules in a calorie?

1 cal = 4.184 J.

How do I convert calorie to joule?

Multiply the calorie value by 4.184. For example, 10 cal × 4.184 = 41.84 J.

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

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

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

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