Kilojoules to Kilocalories
A kilojoule is 1,000 joules, used on nutrition labels outside the US to state food energy content. A kilocalorie, the "Calorie" on food labels, is the energy needed to raise 1 kilogram of water by 1°C. 1 kJ equals ≈0.239006 kcal, so converting between them is a matter of multiplying by that fixed factor — type any value into the converter below and both sides update instantly as you type.
Both units belong to energy, measured here against energy's base unit (J) — every other energy unit on this site converts through that same reference point, which is why the table below can also be read as a quick cross-check against nearby values.
Formula
kcal = kJ × ≈0.239006
kJ = kcal × 4.184
Worked example: 5 kJ × ≈0.239006 = ≈1.19503 kcal.
Conversion table
| Kilojoule (kJ) | Kilocalorie (kcal) |
|---|---|
| 1 kJ | ≈0.239006 kcal |
| 2 kJ | ≈0.478011 kcal |
| 3 kJ | ≈0.717017 kcal |
| 5 kJ | ≈1.19503 kcal |
| 10 kJ | ≈2.39006 kcal |
| 20 kJ | ≈4.78011 kcal |
| 25 kJ | ≈5.97514 kcal |
| 50 kJ | ≈11.9503 kcal |
| 100 kJ | ≈23.9006 kcal |
| 250 kJ | ≈59.7514 kcal |
| 500 kJ | ≈119.503 kcal |
| 1,000 kJ | ≈239.006 kcal |
Frequently asked
- How many Kilocalories in a kilojoule?
- 1 kJ equals ≈0.239006 kcal.
- How do I convert Kilojoules to Kilocalories?
- Multiply the value in kJ by ≈0.239006 to get kcal. The converter above does this instantly as you type.
- Is the conversion exact?
- Yes — Kilojoule and Kilocalorie are both defined by a fixed conversion factor to energy's base unit (J), so the result shown is exact to the precision displayed, not an approximation.