Kilocalories (food Calories) to Joules
Type a value in Kilocalories (food Calories) and get the result in Joules, calculated exactly.
100 Kilocalories (food Calories) = 418,400 Joules
Precision
Exact factorThis result is exact.
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Formula
J = kcal × 4,184
To convert Kilocalories (food Calories) to Joules, multiply the value by 4,184.
Worked examples
- 1 kcal × 4,184 = 4,184 J
- 100 kcal × 4,184 = 418,400 J
- 50 kcal × 4,184 = 209,200 J
This factor is exact by definition.
Conversion table
| Kilocalories (food Calories) (kcal) | Joules (J) |
|---|---|
| 1 | 4,184 |
| 2 | 8,368 |
| 3 | 12,552 |
| 4 | 16,736 |
| 5 | 20,920 |
| 6 | 25,104 |
| 7 | 29,288 |
| 8 | 33,472 |
| 9 | 37,656 |
| 10 | 41,840 |
| 15 | 62,760 |
| 20 | 83,680 |
| 25 | 104,600 |
| 30 | 125,520 |
| 40 | 167,360 |
| 50 | 209,200 |
| 60 | 251,040 |
| 70 | 292,880 |
| 75 | 313,800 |
| 80 | 334,720 |
| 90 | 376,560 |
| 100 | 418,400 |
Values marked ≈ are rounded; the rest are exact.
Reverse table: Joules to Kilocalories (food Calories)
| Joules (J) | Kilocalories (food Calories) (kcal) |
|---|---|
| 1 | ≈ 0.0002390057 |
| 2 | ≈ 0.0004780115 |
| 3 | ≈ 0.0007170172 |
| 4 | ≈ 0.0009560229 |
| 5 | ≈ 0.001195029 |
| 6 | ≈ 0.001434034 |
| 7 | ≈ 0.00167304 |
| 8 | ≈ 0.001912046 |
| 9 | ≈ 0.002151052 |
| 10 | ≈ 0.002390057 |
| 15 | ≈ 0.003585086 |
| 20 | ≈ 0.004780115 |
| 25 | ≈ 0.005975143 |
| 30 | ≈ 0.007170172 |
| 40 | ≈ 0.009560229 |
| 50 | ≈ 0.01195029 |
| 60 | ≈ 0.01434034 |
| 70 | ≈ 0.0167304 |
| 75 | ≈ 0.01792543 |
| 80 | ≈ 0.01912046 |
| 90 | ≈ 0.02151052 |
| 100 | ≈ 0.02390057 |
Unit definitions
- Kilocalories (food Calories) kcal
- Exactly 4184 joules; the "Calorie" on food labels.
- Joules J
- The SI unit of energy: one newton acting over one metre, or one watt for one second.
Questions people ask
Kilocalories (food Calories) to Joules: what is the conversion factor?
One kcal is 4,184 J.
How do I convert Kilocalories (food Calories) to Joules?
Use the formula above. For example, 100 kcal = 418,400 J.
Is the conversion exact?
Yes. Both units have exact definitions, so the factor is exact; a result is only rounded when its decimals never end.
Factors checked 19 October 2026.