At One Place

Kilocalories to kilojoules

1 kilocalorie in kilojoules
1 kcal = 4.184 kJ
kJ = kcal × 4.184

To convert kilocalories to kilojoules, multiply by 4.184. The table below gives the values people look up most often, and the converter works for any number.

Kilocalories to kilojoules table

Common kilocalorie values converted to kilojoules.
Kilocalories Kilojoules
1 kcal 4.184
2 kcal 8.368
3 kcal 12.552
4 kcal 16.736
5 kcal 20.92
10 kcal 41.84
15 kcal 62.76
20 kcal 83.68
25 kcal 104.6
30 kcal 125.52
40 kcal 167.36
50 kcal 209.2
75 kcal 313.8
100 kcal 418.4
250 kcal 1,046
500 kcal 2,092
1,000 kcal 4,184

How the conversion works

The relationship is kJ = kcal × 4.184. Both units measure energy, so the conversion is a fixed factor that never changes.

Kilocalorie: The "calorie" on food labels.

Common questions

How many kilojoules are in one kilocalorie?
One kilocalorie equals 4.184 kilojoules. kJ = kcal × 4.184.
How do you convert kilocalories to kilojoules?
Use kJ = kcal × 4.184. So 10 kcal is 41.84 kJ.
How many kilocalories are in one kilojoule?
One kilojoule equals 0.23901 kilocalories, which is the reverse of the conversion above.
Is there more than one kind of kilocalorie?
The "calorie" on food labels.

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