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Joules to Calories Converter.

Convert joules to calories instantly with this free calculator. 1 calorie = 4.184 J.

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Reference Table

J	kJ	cal	kcal	Wh	kWh	BTU	eV
1	0.001	0.2390057361	0.0002390057	0.0002777778	2.777778e-7	0.0009478134	6.242197e+18
10	0.01	2.390057	0.0023900574	0.0027777778	0.0000027778	0.0094781339	6.242197e+19
100	0.1	23.900574	0.0239005736	0.0277777778	0.0000277778	0.0947813394	6.242197e+20
1000	1	239.005736	0.2390057361	0.2777777778	0.0002777778	0.9478133945	6.242197e+21
10000	10	2390.0574	2.390057	2.777778	0.0027777778	9.478134	6.242197e+22
100000	100	23900.5736	23.900574	27.777778	0.0277777778	94.781339	6.242197e+23
1000000	1000	239005.7361	239.005736	277.777778	0.2777777778	947.813394	6.242197e+24

How to convert joules to calories

Formula. calories = joules ÷ 4.184.

Relationship. 1 calorie = 4.184 J.

Worked example. 1000 J = 239.005736 cal.

joules to calories conversion table

J	cal
1	0.2390057361
5	1.195029
10	2.390057
25	5.975143
50	11.950287
100	23.900574
250	59.751434
418.4	100
500	119.502868
750	179.254302
1000	239.005736
2000	478.011472
2500	597.51434
4184	1000
5000	1195.0287
7500	1792.543
10000	2390.0574
25000	5975.1434
41840	10000
50000	11950.2868
100000	23900.5736
250000	59751.434
418400	100000
1000000	239005.7361
8368000	2000000

FAQ

Frequently Asked Questions

How do I convert joules to calories?

Divide by 4.184. For example, 1,000 J ÷ 4.184 ≈ 239 calories — that is 239 scientific calories, not food Calories.

Are these the same calories as on food labels?

No. Food labels print kilocalories (kcal), each worth 1,000 of the calories here. A 250-Calorie snack is 250 kcal = 250,000 cal = 1,046,000 joules. This is the most common energy-unit mistake there is.

How many joules is 1 kcal?

4,184 joules, or 4.184 kJ. So a 2,000 kcal daily diet is 8,368 kJ — the figure Australian and European labels print directly.

Why is the calorie still used at all?

It was defined as the energy to heat one gram of water by one degree Celsius, which made it intuitive for chemistry and nutrition long before SI. Science has largely moved to joules, but nutrition kept the calorie because consumers recognise it.

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