Kilocalories to Joules Converter
1 kilocalorie = 4,184 joules
This is the unit written as "Calories" on nutrition labels.
1 kilocalorie equals 4,184 joules
How to convert kilocalories to joules
Calories here are thermochemical (4.184 J), while BTU uses the International Table definition. A kilowatt-hour is energy (3.6 MJ), not power; a food Calorie is a kilocalorie.
J = kcal × 4184One kilocalorie is 4184 joules, so a single multiplication converts any value.
41,840 J = 10 × 4184This is the unit written as "Calories" on nutrition labels.
Kilocalories to joules conversion table
Common values in kilocalories, converted to joules.
| 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 |
About these units
kilocaloriekcal
One thousand thermochemical calories: exactly 4,184 joules.
jouleJ
The SI derived unit of energy: one newton acting through one metre.
Sources and precision
Table results are rounded to 8 significant digits; formula constants may be rounded to 10. Worked example answers use 6 significant digits. The converter starts at 6 significant digits and lets you change display precision. Calculations use the stored factors without intermediate rounding. Exact unit definitions do not make an input measurement more precise; conventional and measured factors follow the assumptions stated here.