Kilocalories to Kilojoules

One kilocalorie equals 4.184 kilojoules.

Kilojoules = kilocalories × 4.184

By Piero Nanni · Last checked 26 September 2026

Kilocalories to Kilojoules Calculator

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Common Conversions

How to Convert Kilocalories to Kilojoules

Formula:

Kilojoules = kilocalories × 4.184

Worked example:

200 kilocalories × 4.184 = 836.8 kilojoules

Kilocalories to Kilojoules Conversion Table

kcal	kJ
1	4.184
1.5	6.276
2	8.368
2.5	10.46
3	12.552
4	16.736
5	20.92
6	25.104
7	29.288
7.5	31.38
8	33.472
9	37.656
10	41.84
15	62.76
20	83.68
25	104.6
30	125.52
40	167.36
50	209.2
60	251.04
70	292.88
75	313.8
80	334.72
90	376.56
100	418.4
150	627.6
200	836.8
250	1046
300	1255.2
400	1673.6
500	2092
600	2510.4
700	2928.8
750	3138
800	3347.2
900	3765.6
1000	4184
1500	6276
2000	8368

About This Conversion

Kilocalories to kilojoules multiplies by 4.184, and is the conversion between the two units food labels use. The kilocalorie is what Americans call a Calorie; the kilojoule is what appears first on labels in Australia, New Zealand and much of Europe.

The daily reference figures make the scale clear: 2,000 kcal is 8,368 kJ, and the 8,700 kJ printed on Australian labels is 2,079 kcal. The two systems describe the same energy, so a product is not more or less caloric for being labelled in kilojoules.