Joules to Kilocalories (food Calories)

Type a value in Joules and get the result in Kilocalories (food Calories), calculated exactly.

1 J ≈ 0.000239005736 kcal Energy converter

From

Precision

Exact factorRounded for display to about 10 significant digits.

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kcal = J ÷ 4,184

To convert Joules to Kilocalories (food Calories), divide the value by 4,184.

This factor is exact by definition.

Joules to Kilocalories (food Calories)
Joules (J)	Kilocalories (food Calories) (kcal)
1	≈ 0.0002390057
2	≈ 0.0004780115
3	≈ 0.0007170172
4	≈ 0.0009560229
5	≈ 0.001195029
6	≈ 0.001434034
7	≈ 0.00167304
8	≈ 0.001912046
9	≈ 0.002151052
10	≈ 0.002390057
15	≈ 0.003585086
20	≈ 0.004780115
25	≈ 0.005975143
30	≈ 0.007170172
40	≈ 0.009560229
50	≈ 0.01195029
60	≈ 0.01434034
70	≈ 0.0167304
75	≈ 0.01792543
80	≈ 0.01912046
90	≈ 0.02151052
100	≈ 0.02390057

Values marked ≈ are rounded; the rest are exact.

Reverse table: Kilocalories (food Calories) to Joules

Kilocalories (food Calories) to Joules
Kilocalories (food Calories) (kcal)	Joules (J)
1	4,184
2	8,368
3	12,552
4	16,736
5	20,920
6	25,104
7	29,288
8	33,472
9	37,656
10	41,840
15	62,760
20	83,680
25	104,600
30	125,520
40	167,360
50	209,200
60	251,040
70	292,880
75	313,800
80	334,720
90	376,560
100	418,400

Joules J: The SI unit of energy: one newton acting over one metre, or one watt for one second.
Kilocalories (food Calories) kcal: Exactly 4184 joules; the "Calorie" on food labels.

Joules to Kilocalories (food Calories): what is the conversion factor?

One J is ≈ 0.000239005736 kcal.

How do I convert Joules to Kilocalories (food Calories)?

Use the formula above. For example, 100 J = ≈ 0.02390057361 kcal.

Is the conversion exact?

Yes. Both units have exact definitions, so the factor is exact; a result is only rounded when its decimals never end.

Factors checked 19 October 2026.