At One Place

Kilocalories to joules

1 kilocalorie in joules
1 kcal = 4,184 J
J = kcal × 4,184

To convert kilocalories to joules, multiply by 4,184. The table below gives the values people look up most often, and the converter works for any number.

Kilocalories to joules table

Common kilocalorie values converted to joules.
Kilocalories Joules
1 kcal 4,184
2 kcal 8,368
3 kcal 12,552
4 kcal 16,736
5 kcal 20,920
10 kcal 41,840
15 kcal 62,760
20 kcal 83,680
25 kcal 104,600
30 kcal 125,520
40 kcal 167,360
50 kcal 209,200
75 kcal 313,800
100 kcal 418,400
250 kcal 1,046,000
500 kcal 2,092,000
1,000 kcal 4,184,000

How the conversion works

The relationship is J = 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 joules are in one kilocalorie?
One kilocalorie equals 4,184 joules. J = kcal × 4,184.
How do you convert kilocalories to joules?
Use J = kcal × 4,184. So 10 kcal is 41,840 J.
How many kilocalories are in one joule?
One joule equals 0.000239 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