calories (cal)

calories as a conversion hub: 6 direct pairs, all with the exact factor on the page.

Definition1 cal = 0.004184 kJ exactly

CategoryEnergy Converter

Pairs from here6

Energy Converter

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calories converted to every other unit

cal	J	kJ	kcal	Wh	kWh	Btu
1 cal	4.184	0.004184	0.001	0.0011622222	0.0000011622	0.0039656668
2 cal	8.368	0.008368	0.002	0.0023244444	0.0000023244	0.0079313337
5 cal	20.92	0.02092	0.005	0.0058111111	0.0000058111	0.01982833
10 cal	41.84	0.04184	0.01	0.01162222	0.0000116222	0.03965667
20 cal	83.68	0.08368	0.02	0.02324444	0.0000232444	0.07931334
50 cal	209.2	0.2092	0.05	0.05811111	0.0000581111	0.19828334
100 cal	418.4	0.4184	0.1	0.11622222	0.0001162222	0.39656668

All conversions starting from cal

cal to J cal to kJ cal to kcal cal to Wh cal to kWh cal to Btu

Questions

How do I convert from calories?

Pick the target unit from the table on this page, or open the dedicated pair page — each one carries a converter, a table of common values and the exact factor.

Is calorie exact or approximate?

The factor shown (1 cal = 0.004184 kJ) is fixed by definition, so conversions are exact rather than measured.

What is calorie used for?

calories as used in practical measurements