Convert Kilojoules to Kilocalories
One kilojoule equals 0.239006 kilocalories. Type any value to convert kilojoules to kilocalories instantly — with a full reference table below.
Convert Kilojoules to Kilocalories
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How to convert Kilojoules to Kilocalories
To convert kilojoules to kilocalories, multiply by 0.239006. One kilojoule equals 0.239006 kcal, and one kilocalorie equals 4.184 kJ.
- Take the value in kilojoules — for example 7.5 kJ.
- Multiply by 0.239006 (the number of kilocalories in one kilojoule).
- 7.5 × 0.239006 = 1.792543 kcal.
Quick mental estimate: Divide the number of kilojoules by 4.2 (within 0.4% of the exact answer).
Kilojoules to Kilocalories conversion table
| Kilojoules | Kilocalories |
|---|---|
| 1 kJ | 0.239006 kcal |
| 2 kJ | 0.478011 kcal |
| 5 kJ | 1.195029 kcal |
| 10 kJ | 2.390057 kcal |
| 20 kJ | 4.780115 kcal |
| 50 kJ | 11.95029 kcal |
| 100 kJ | 23.90057 kcal |
| 200 kJ | 47.80115 kcal |
| 500 kJ | 119.5029 kcal |
| 1,000 kJ | 239.0057 kcal |
| 2,000 kJ | 478.0115 kcal |
| Kilocalories | Kilojoules |
|---|---|
| 1 kcal | 4.184 kJ |
| 2 kcal | 8.368 kJ |
| 5 kcal | 20.92 kJ |
| 10 kcal | 41.84 kJ |
| 20 kcal | 83.68 kJ |
| 50 kcal | 209.2 kJ |
| 100 kcal | 418.4 kJ |
| 200 kcal | 836.8 kJ |
| 500 kcal | 2,092 kJ |
| 1,000 kcal | 4,184 kJ |
| 2,000 kcal | 8,368 kJ |
About converting Kilojoules to Kilocalories
Kilojoules (kJ) and Kilocalories (kcal) are both units of energy. The exact factor is 1 kJ = 0.239006 kcal, so multiply by 0.239006 to go from kilojoules to kilocalories (or divide to go back).
The conversion runs entirely in your browser. Need the reverse? Use the Kilocalories to Kilojoules converter, or the full unit converter for every unit at once.
Real-world energy in kilojoules and kilocalories
| Example | Kilojoules | Kilocalories |
|---|---|---|
| One food Calorie (kcal) | 4.184 kJ | 1 kcal |
| A 100 W bulb running for one hour | 360 kJ | 86.04207 kcal |
| A smartphone battery (≈19 Wh) | ≈ 69.3 kJ | ≈ 16.5631 kcal |
| A 2,000 kcal daily diet | 8,368 kJ | 2,000 kcal |
| One kilowatt-hour | 3,600 kJ | 860.4207 kcal |
“≈” marks typical values; the rest are defined or measured figures.
The units
1,000 joules.
Used for: Food energy on labels in Australia and the EU.
1,000 calories, exactly 4,184 J — the 'Calorie' on food labels.
Used for: Nutrition and diets.
The thermochemical calorie is exactly 4.184 J and a kilowatt-hour is exactly 3.6 MJ, so these factors are exact.