Kilocalories to Kilojoules
Convert kilocalories to kilojoules instantly.
Kilocalories to Kilojoules (kcal to kJ) Converter
1 kilocalorie (food Calorie) = 4.184 kilojoules
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- 1 kcal = 4.184 kJ
- 5 kcal = 20.92 kJ
- 10 kcal = 41.84 kJ
- 25 kcal = 104.6 kJ
- KilojouleskJ
- Kilocalorieskcal
- KilojouleskJ
- Kilocalorieskcal
How it’s calculated
kJ = kcal × 4.184
- Multiply the value in kilocalories by 4.184.
- To go back, divide by 4.184 (or multiply by 0.2390057361).
- 1 kcal = 4.184 kJ · 1 kJ = 0.2390057361 kcal
Quick examples
1 kilocalorie (food Calorie) = 4.184 kilojoules · 1 kJ = 0.23901 kcal
- 1 kilocalorie (food Calorie) = 4.184 kilojoules
- 5 kilocalories = 20.92 kilojoules
- 10 kilocalories = 41.84 kilojoules
- 25 kilocalories = 104.6 kilojoules
- 100 kilocalories = 418.4 kilojoules
Kilocalories to kilojoules conversion table
| Kilocalories (kcal) | Kilojoules (kJ) |
|---|---|
| 0.1 kcal | 0.4184 kJ |
| 0.5 kcal | 2.092 kJ |
| 1 kcal | 4.184 kJ |
| 2 kcal | 8.368 kJ |
| 3 kcal | 12.552 kJ |
| 4 kcal | 16.736 kJ |
| 5 kcal | 20.92 kJ |
| 6 kcal | 25.104 kJ |
| 7 kcal | 29.288 kJ |
| 8 kcal | 33.472 kJ |
| 9 kcal | 37.656 kJ |
| 10 kcal | 41.84 kJ |
| 15 kcal | 62.76 kJ |
| 20 kcal | 83.68 kJ |
| 25 kcal | 104.6 kJ |
| 30 kcal | 125.52 kJ |
| 40 kcal | 167.36 kJ |
| 50 kcal | 209.2 kJ |
| 75 kcal | 313.8 kJ |
| 100 kcal | 418.4 kJ |
| 250 kcal | 1,046 kJ |
| 500 kcal | 2,092 kJ |
| 1,000 kcal | 4,184 kJ |
About these units
Kilocalorie (food Calorie) (kcal)
other
1 kcal = 4,184 J (exact)
Exactly 4,184 J. The "Calorie" on food labels is one of these.
Source: NIST SP 811 / Handbook 44
Kilojoule (kJ)
SI (metric)
1 kJ = 1,000 J (exact)
Source: BIPM SI Brochure (9th ed.) (SI prefixes and accepted units)
Frequently asked questions
How do I convert kilocalories to kilojoules?
Use kJ = kcal × 4.184. Multiply the value in kilocalories by 4.184.
How many kilojoules are in 1 kilocalorie (food Calorie)?
1 kilocalorie (food Calorie) (kcal) equals 4.184 kilojoules (kJ).
How many kilocalories are in 1 kilojoule?
1 kilojoule (kJ) equals 0.23901 kilocalories (kcal); more precisely 0.2390057361.
What is 10 kcal in kJ?
10 kilocalories = 41.84 kilojoules.
What is a kilocalorie (food Calorie)?
Exactly 4,184 J. The "Calorie" on food labels is one of these.
Related conversions
Formula: kJ = kcal × 4.184. Factors last reviewed 2026-10-27.