Kilojoules to Calories
A kilojoule is 1,000 joules, used on nutrition labels outside the US to state food energy content. A small calorie is the energy to raise 1 gram of water by 1°C, a base unit distinct from the food Calorie (kcal). 1 kJ equals ≈239.006 cal, 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
cal = kJ × ≈239.006
kJ = cal × 0.004184
Worked example: 5 kJ × ≈239.006 = ≈1,195.03 cal.
Conversion table
| Kilojoule (kJ) | Calorie (cal) |
|---|---|
| 1 kJ | ≈239.006 cal |
| 2 kJ | ≈478.011 cal |
| 3 kJ | ≈717.017 cal |
| 5 kJ | ≈1,195.03 cal |
| 10 kJ | ≈2,390.06 cal |
| 20 kJ | ≈4,780.11 cal |
| 25 kJ | ≈5,975.14 cal |
| 50 kJ | ≈11,950.3 cal |
| 100 kJ | ≈23,900.6 cal |
| 250 kJ | ≈59,751.4 cal |
| 500 kJ | ≈119,503 cal |
| 1,000 kJ | ≈239,006 cal |
Frequently asked
- How many Calories in a kilojoule?
- 1 kJ equals ≈239.006 cal.
- How do I convert Kilojoules to Calories?
- Multiply the value in kJ by ≈239.006 to get cal. The converter above does this instantly as you type.
- Is the conversion exact?
- Yes — Kilojoule and Calorie 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.