how many kj in a calorie

One (food) calorie is equal to about 4.18 kilojoules (kJ).

Basic conversion

• In nutrition, the “calories” on food labels are actually kilocalories (kcal).

• The standard relationship is:
  • 1 kcal (food calorie) ≈ 4.18 kJ.

• So if something has 100 Calories on the label, that is about 418 kJ of energy.

Quick mental math

• To go from calories to kJ: multiply by about 4 (or 4.18 for more precision).

• To go from kJ to calories: divide by about 4.

Example: 500 Calories ≈ 500 × 4.18 = 2,090 kJ (often rounded to 2,100 kJ).

Information gathered from public forums or data available on the internet and portrayed here.