At One Place

Calories to kilojoules

1 calorie in kilojoules
1 cal = 0.004184 kJ
kJ = cal × 0.004184

To convert calories to kilojoules, multiply by 0.004184. The table below gives the values people look up most often, and the converter works for any number.

Calories to kilojoules table

Common calorie values converted to kilojoules.
Calories Kilojoules
1 cal 0.004184
2 cal 0.008368
3 cal 0.012552
4 cal 0.016736
5 cal 0.02092
10 cal 0.04184
15 cal 0.06276
20 cal 0.08368
25 cal 0.1046
30 cal 0.12552
40 cal 0.16736
50 cal 0.2092
75 cal 0.3138
100 cal 0.4184
250 cal 1.046
500 cal 2.092
1,000 cal 4.184

How the conversion works

The relationship is kJ = cal × 0.004184. Both units measure energy, so the conversion is a fixed factor that never changes.

Calorie: Thermochemical (small) calorie.

Common questions

How many kilojoules are in one calorie?
One calorie equals 0.004184 kilojoules. kJ = cal × 0.004184.
How do you convert calories to kilojoules?
Use kJ = cal × 0.004184. So 10 cal is 0.04184 kJ.
How many calories are in one kilojoule?
One kilojoule equals 239.0057 calories, which is the reverse of the conversion above.
Is there more than one kind of calorie?
Thermochemical (small) calorie.

Related pages

Sources

  1. Guide for the Use of the International System of Units (SP 811) — NIST (Public domain (US Government))
  2. The International System of Units (SI Brochure) — Bureau International des Poids et Mesures
  3. Calculated on this page — At One Place

How these figures are compiled and checked