NiftyRecipe Online energy conversion
MJ/cal 239005.736138 kJ/kcal 0.239006 kWh/kJ 3600 kJ/kWh 0.000278 cal/MJ 0.000004 MJ/kJ 1000
cal / kJ

1 calorie in kilojoule

0.004184 kilojoule

1 cal = 0.004184 kJ · factor

Nutrition packaging often lists both kcal and kJ. This tool applies a fixed conversion ratio only.

Enter a value and click Calculate - opens the page with the new result

Common values

kilojoule to calorie 2 calories in kilojoule 5 calories in kilojoule 10 calories in kilojoule 20 calories in kilojoule 25 calories in kilojoule 50 calories in kilojoule 75 calories in kilojoule 100 calories in kilojoule 120 calories in kilojoule 150 calories in kilojoule

Same amount, other units

1 calorie → kcal 1 calorie → BTU 1 calorie → kWh 1 calorie → MJ
Formula: calorie to kilojoule

kJ = cal × 0.004184 (1 CAL = 0.004184 KJ)

Reference values: calorie → kilojoule
cal kJ
1 cal 0.004184 kJ
100 cal 0.4184 kJ
200 cal 0.8368 kJ
500 cal 2.092 kJ
1000 cal 4.184 kJ
2000 cal 8.368 kJ

All amounts for this pair

FAQ for cal → kJ
1 calorie in kilojoule

1 calorie is 0.004184 kilojoule using the standard food-energy factor on NiftyRecipe.

Package labels, recipe macros and fitness apps often jump between kilocalories and smaller calorie units (or kilojoules). Here the ratio stays constant: 1 calorie = 0.004184 kilojoule, so 1 calorie always maps to 0.004184 kilojoule until you change the input. The reverse figure is 1 kilojoule ≈ 239.005736 calorie.

Use the field above to try another portion size, scale a recipe, or match two apps that print different units. Everything on this page stays inside nutrition-style energy units-no length, temperature or other measures mixed in.