Convert Kilocalories to Joules
One kilocalorie equals 4,184 joules. Type any value to convert kilocalories to joules instantly — with a full reference table below.
Convert Kilocalories to Joules
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How to convert Kilocalories to Joules
To convert kilocalories to joules, multiply by 4,184. One kilocalorie equals 4,184 J, and one joule equals 0.000239006 kcal.
- Take the value in kilocalories — for example 7.5 kcal.
- Multiply by 4,184 (the number of joules in one kilocalorie).
- 7.5 × 4,184 = 31,380 J.
Kilocalories to Joules conversion table
| Kilocalories | Joules |
|---|---|
| 1 kcal | 4,184 J |
| 2 kcal | 8,368 J |
| 5 kcal | 20,920 J |
| 10 kcal | 41,840 J |
| 20 kcal | 83,680 J |
| 50 kcal | 209,200 J |
| 100 kcal | 418,400 J |
| 200 kcal | 836,800 J |
| 500 kcal | 2,092,000 J |
| 1,000 kcal | 4,184,000 J |
| 2,000 kcal | 8,368,000 J |
| Joules | Kilocalories |
|---|---|
| 1 J | 0.000239006 kcal |
| 2 J | 0.000478011 kcal |
| 5 J | 0.00119503 kcal |
| 10 J | 0.00239006 kcal |
| 20 J | 0.00478011 kcal |
| 50 J | 0.0119503 kcal |
| 100 J | 0.0239006 kcal |
| 200 J | 0.0478011 kcal |
| 500 J | 0.119503 kcal |
| 1,000 J | 0.239006 kcal |
| 2,000 J | 0.478011 kcal |
About converting Kilocalories to Joules
Kilocalories (kcal) and Joules (J) are both units of energy. The exact factor is 1 kcal = 4,184 J, so multiply by 4,184 to go from kilocalories to joules (or divide to go back).
The conversion runs entirely in your browser. Need the reverse? Use the Joules to Kilocalories converter, or the full unit converter for every unit at once.
Real-world energy in kilocalories and joules
| Example | Kilocalories | Joules |
|---|---|---|
| One food Calorie (kcal) | 1 kcal | 4,184 J |
| A 100 W bulb running for one hour | 86.04207 kcal | 360,000 J |
| A smartphone battery (≈19 Wh) | ≈ 16.5631 kcal | ≈ 69,300 J |
“≈” marks typical values; the rest are defined or measured figures.
The units
1,000 calories, exactly 4,184 J — the 'Calorie' on food labels.
Used for: Nutrition and diets.
The SI unit of energy: the work done by one newton over one metre.
Used for: Science and food labels (kJ).
The thermochemical calorie is exactly 4.184 J and a kilowatt-hour is exactly 3.6 MJ, so these factors are exact.