1 calorie (cal) = 4.184 joules (J). To convert, multiply by 4.184: J = cal × 4.184. For example, 5 cal = 20.92 J.
J = cal × 4.184
Calories to joules table
| Calories (cal) | Joules (J) |
|---|---|
| 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
Calorie (cal). The thermochemical calorie, exactly 4.184 joules. Food "Calories" are kilocalories.
Joule (J). The SI unit of energy: one newton acting over one meter.
Because both units are defined in terms of the same base unit, the factor 4.184 is exact, not a rounded measurement.
Convert calories to other units
- Calories to kilojoules — 1 cal = 0.004184 kJ
- 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 joules
Questions people ask
- How many joules are in a calorie?
- 4.184, exactly.
- How do you convert calories to joules?
- J = cal × 4.184. It is the same as dividing by 0.2390057361.
- How do you convert joules back to calories?
- cal = J ÷ 4.184. See joules 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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