1 calorie (cal) = 0.004184 kilojoules (kJ). To convert, divide by 239.0057361: kJ = cal ÷ 239.0057361. For example, 50 cal = 0.2092 kJ.
kJ = cal ÷ 239.0057361
Calories to kilojoules table
| Calories (cal) | Kilojoules (kJ) |
|---|---|
| 10 | 0.04184 |
| 20 | 0.08368 |
| 30 | 0.12552 |
| 40 | 0.16736 |
| 50 | 0.2092 |
| 100 | 0.4184 |
| 200 | 0.8368 |
| 250 | 1.046 |
| 500 | 2.092 |
| 1,000 | 4.184 |
| 2,500 | 10.46 |
| 5,000 | 20.92 |
| 10,000 | 41.84 |
The two units
Calorie (cal). The thermochemical calorie, exactly 4.184 joules. Food "Calories" are kilocalories.
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 0.004184 is exact, not a rounded measurement.
Convert calories to other units
- Calories to joules — 1 cal = 4.184 J
- Calories to kilocalories — 1 cal = 0.001 kcal
- Calories to watt-hours — 1 cal = 0.0011622222 Wh
- Calories to kilowatt-hours — 1 cal = 0.0000011622 kWh
- Calories to British thermal units — 1 cal = 0.0039656668 BTU
- Calories to electronvolts — 1 cal = 2.611447e+19 eV
Convert other units to kilojoules
Questions people ask
- How many kilojoules are in a calorie?
- 0.004184, exactly.
- How do you convert calories to kilojoules?
- kJ = cal ÷ 239.0057361. It is the same as dividing by 239.0057361.
- How do you convert kilojoules back to calories?
- cal = kJ × 239.0057361. See kilojoules to calories.
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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