1 kilocalorie (kcal) = 4.184 kilojoules (kJ). To convert, multiply by 4.184: kJ = kcal × 4.184. For example, 5 kcal = 20.92 kJ.
kJ = kcal × 4.184
Kilocalories to kilojoules table
| Kilocalories (kcal) | Kilojoules (kJ) |
|---|---|
| 1 | 4.184 |
| 2 | 8.368 |
| 3 | 12.552 |
| 4 | 16.736 |
| 5 | 20.92 |
| 10 | 41.84 |
| 20 | 83.68 |
| 25 | 104.6 |
| 50 | 209.2 |
| 100 | 418.4 |
| 250 | 1,046 |
| 500 | 2,092 |
| 1,000 | 4,184 |
The two units
Kilocalorie (kcal). One thousand calories: the "Calorie" on food labels.
Kilojoule (kJ). One thousand joules; food labels outside the US often give energy in kJ.
Because both units are defined in terms of the same base unit, the factor 4.184 is exact, not a rounded measurement.
Convert kilocalories to other units
- Kilocalories to joules — 1 kcal = 4,184 J
- Kilocalories to calories — 1 kcal = 1,000 cal
- Kilocalories to watt-hours — 1 kcal = 1.162222222 Wh
- Kilocalories to kilowatt-hours — 1 kcal = 0.0011622222 kWh
- Kilocalories to British thermal units — 1 kcal = 3.965666831 BTU
- Kilocalories to electronvolts — 1 kcal = 2.611447e+22 eV
Convert other units to kilojoules
Questions people ask
- How many kilojoules are in a kilocalorie?
- 4.184, exactly.
- How do you convert kilocalories to kilojoules?
- kJ = kcal × 4.184. It is the same as dividing by 0.2390057361.
- How do you convert kilojoules back to kilocalories?
- kcal = kJ ÷ 4.184. See kilojoules to kilocalories.
Results use the legal definitions of each unit and are checked against the Pint unit library. Display rounds to 10 significant digits. All unit conversions · More tools
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