1 J = 0.000239006 kcal
1 joule equals 0.000239006 kilocalories. To convert joules to kilocalories, multiply the joule value by 0.000239006. For quick reference: 1 J = 0.000239006 kcal, 5 J = 0.00119503 kcal, 10 J = 0.00239006 kcal, 100 J = 0.0239006 kcal.
Kilocalories = Joules × 0.000239006Start with your value in joules.
Multiply the joule value by 0.000239006. This is the exact conversion factor from joules to kilocalories.
The product is your value in kilocalories. For example, 5 J × 0.000239006 = 0.00119503 kcal.
The exact factor from joules to kilocalories is 0.000239006.
Kilocalories = Joules × 0.000239006
Fifty common reference values, hand-picked for skim utility. Use the calculator above for any value not listed.
| Joules (J) | Kilocalories (kcal) |
|---|---|
| 0.001 J | 2.3901 × 10^−7 kcal |
| 0.01 J | 2.3901 × 10^−6 kcal |
| 0.1 J | 2.3901 × 10^−5 kcal |
| 0.5 J | 0.0001195 kcal |
| 1 J | 0.00023901 kcal |
| 1.5 J | 0.00035851 kcal |
| 2 J | 0.00047801 kcal |
| 5 J | 0.001195 kcal |
| 10 J | 0.0023901 kcal |
| 20 J | 0.0047801 kcal |
| 50 J | 0.01195 kcal |
| 100 J | 0.023901 kcal |
| 200 J | 0.047801 kcal |
| 250 J | 0.059751 kcal |
| 500 J | 0.1195 kcal |
| 1000 J | 0.23901 kcal |
| 2000 J | 0.47801 kcal |
| 2500 J | 0.59751 kcal |
| 3600 J | 0.86042 kcal |
| 5000 J | 1.195 kcal |
| 7500 J | 1.7925 kcal |
| 10000 J | 2.3901 kcal |
| 25000 J | 5.9751 kcal |
| 50000 J | 11.95 kcal |
| 100000 J | 23.901 kcal |
| 250000 J | 59.751 kcal |
| 500000 J | 119.5 kcal |
| 1000000 J | 239.01 kcal |
| 2000000 J | 478.01 kcal |
| 3600000 J | 860.42 kcal |
| 5000000 J | 1195 kcal |
| 10000000 J | 2390.1 kcal |
| 25000000 J | 5975.1 kcal |
| 50000000 J | 11950 kcal |
| 100000000 J | 23901 kcal |
| 250000000 J | 59751 kcal |
| 500000000 J | 119503 kcal |
| 1000000000 J | 239006 kcal |
| 2000000000 J | 478011 kcal |
| 5000000000 J | 1195029 kcal |
| 10000000000 J | 2390057 kcal |
| 20000000000 J | 4780115 kcal |
| 50000000000 J | 11950287 kcal |
| 100000000000 J | 23900574 kcal |
| 1000000000000 J | 239005736 kcal |
| 10000000000000 J | 2390057361 kcal |
| 100000000000000 J | 23900573614 kcal |
| 1000000000000000 J | 239005736138 kcal |
| 10000000000000000 J | 2390057361377 kcal |
| 100000000000000000 J | 23900573613767 kcal |
A heartbeat releases about 1 J of mechanical work. Lifting an apple 1 m takes roughly 1 J.
The joule (J) is the SI derived unit of energy, work, and heat — defined as the energy transferred when a force of one newton acts over one meter. The joule is the standard unit in physics, chemistry, and most modern engineering documentation.
The kilocalorie (kcal) equals exactly 4,184 joules — 1,000 small calories. This is the 'Calorie' (capital C) printed on US nutrition labels: when a food package says '250 Calories', it means 250 kcal. Outside the US, food energy is usually labeled in kJ as well.