1 kilocalorie (kcal) = 4,184 joules (J). To convert, multiply by 4,184: J = kcal × 4,184. For example, 5 kcal = 20,920 J.
J = kcal × 4,184
Kilocalories to joules table
| Kilocalories (kcal) | Joules (J) |
|---|---|
| 1 | 4,184 |
| 2 | 8,368 |
| 3 | 12,552 |
| 4 | 16,736 |
| 5 | 20,920 |
| 10 | 41,840 |
| 20 | 83,680 |
| 25 | 104,600 |
| 50 | 209,200 |
| 100 | 418,400 |
| 250 | 1,046,000 |
| 500 | 2,092,000 |
| 1,000 | 4,184,000 |
The two units
Kilocalorie (kcal). One thousand calories: the "Calorie" on food labels.
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 kilocalories to other units
- Kilocalories to kilojoules — 1 kcal = 4.184 kJ
- 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 joules
Questions people ask
- How many joules are in a kilocalorie?
- 4,184, exactly.
- How do you convert kilocalories to joules?
- J = kcal × 4,184. It is the same as dividing by 0.0002390057.
- How do you convert joules back to kilocalories?
- kcal = J ÷ 4,184. See joules 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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