Convert kilocalories to joules and joules to kcal instantly. Bidirectional energy converter with formula and common values.
Multiply the kilocalorie value by 4,184 to get joules. The kilocalorie is the familiar food "Calorie" used on nutrition labels, while the joule is the SI unit of energy.
| Kilocalories | Joules |
|---|---|
| 5 | 20,920 |
| 25 | 104,600 |
| 100 | 418,400 |
| 250 | 1,046,000 |
| 500 | 2,092,000 |
| 1,000 | 4,184,000 |
| 2,000 | 8,368,000 |
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One kilocalorie equals exactly 4,184 joules. This is based on the thermochemical definition where 1 calorie = 4.184 joules.
Multiply the kcal value by 4,184. For example, 3.5 kcal × 4,184 = 14,644 J.
A 600 kcal meal contains about 2,510,400 joules (2.51 MJ). The daily recommended 2,000 kcal intake equals 8,368,000 joules (8.37 MJ).
Joules are the SI standard, but kilocalories remain common in nutrition, biochemistry, and older scientific literature. Many food databases still report energy in kcal alongside kJ.