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Convert calorie to kilojoule

Here you can quickly calculate how many kilojoule fit in one calorie.

- scroll: formula · table · questions -

  • 1 cal = 0.004184 kJ
  • 1 kJ = 239.005736 cal

Calorie to kilojoule conversion table

calorie kilojoule
1 0.004184
2 0.008368
5 0.02092
10 0.04184
20 0.08368
50 0.2092
100 0.4184

Formula to convert calorie to kilojoule

To convert calorie to kilojoule, multiply by 0.004184.

1 cal = 0.004184 kJ
Example: 1 calorie = 0.004184 kilojoule

Common mistakes

  • Food 'calories' are actually kilocalories: 1 kcal = 1,000 cal. A '500-calorie' meal therefore contains 500 kcal, half a million small calories. Labels write the same thing as 'kcal' or as 'Cal' with a capital C.
  • The relationship is exact: 1 kWh = 3.6 MJ (3,600 kJ, because an hour has 3,600 seconds). The common slip is dividing when you should multiply: 10 kWh is 36 MJ, not 2.8. Remember the direction: kWh → MJ means times 3.6.

Quick calorie to/from kilojoule conversion quiz

Score: 0

11.8 kilojoule equals 4.23e+3 calorie.

Correct answer: 11.8 kilojoule = 2.82e+3 calorie.

213 kilojoule equals 3.05e+4 calorie.

Correct answer: 213 kilojoule = 5.09e+4 calorie.

73 kilojoule equals 1.74e+4 calorie.

Correct answer: 73 kilojoule = 1.74e+4 calorie.

28 calorie equals 0.117 kilojoule.

Correct answer: 28 calorie = 0.117 kilojoule.

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