100 calories in kilojoule

0.4184 kilojoule

1 cal = 0.004184 kJ · factor

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

Common values

kilojoule to calorie 1 calorie in kilojoule 2 calories in kilojoule 3 calories in kilojoule 4 calories in kilojoule 5 calories in kilojoule 6 calories in kilojoule 8 calories in kilojoule 10 calories in kilojoule 12 calories in kilojoule 15 calories in kilojoule

Same amount, other units

100 calories → kcal 100 calories → BTU 100 calories → kWh 100 calories → MJ

Related converters

cal → kcal cal → BTU cal → kWh cal → 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

100 calories in kilojoule

100 calories is 0.4184 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 100 calories always maps to 0.4184 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.