kilojoules (kJ)

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

DefinitionReference unit for energy — every other factor in this category is expressed against it

CategoryEnergy Converter

Pairs from here6

Energy Converter

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kilojoules converted to every other unit

kJ	J	cal	kcal	Wh	kWh	Btu
1 kJ	1,000	239.006	0.23900574	0.27777778	0.0002777778	0.94781712
2 kJ	2,000	478.011	0.47801147	0.55555556	0.0005555556	1.895634
5 kJ	5,000	1,195.03	1.195029	1.388889	0.0013888889	4.739086
10 kJ	10,000	2,390.06	2.390057	2.777778	0.0027777778	9.478171
20 kJ	20,000	4,780.11	4.780115	5.555556	0.0055555556	18.956342
50 kJ	50,000	11,950.29	11.950287	13.888889	0.01388889	47.390856
100 kJ	100,000	23,900.57	23.900574	27.777778	0.02777778	94.781712

All conversions starting from kJ

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

Questions

How do I convert from kilojoules?

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 kilojoule exact or approximate?

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

What is kilojoule used for?

food energy where labels follow the metric convention