Kilocalories to Kilojoules Converter
1 kilocalorie = 4.184 kilojoules.
Enter a value
Result
1 kilocalorie =
4.184 kJ
1 kcal × 4.184 = 4.184 kJ
1 kcal = 4.184 kJ · 1 kWh = 3,600 kJ
The working
- 1. Convert 1 kcal to joules: 1 × 4,184 = 4,184.
- 2. Convert to kJ: 4,184 ÷ 1,000 = 4.184.
1 kcal in every unit
Everyday energy
- A banana
- ≈ 400 kJ (95 kcal)
- Boiling a kettle
- ≈ 0.1 kWh
- A litre of petrol
- ≈ 34 MJ
Conversion table
Kilocalories to Kilojoules
| Kilocalories | Kilojoules |
|---|---|
| 50 | 209.2 |
| 100 | 418.4 |
| 200 | 836.8 |
| 250 | 1,046 |
| 500 | 2,092 |
| 1,000 | 4,184 |
| 1,500 | 6,276 |
| 2,000 | 8,368 |
| 2,500 | 10,460 |
| 3,000 | 12,552 |
Kilojoules to Kilocalories
| Kilojoules | Kilocalories |
|---|---|
| 50 | 11.95 |
| 100 | 23.901 |
| 200 | 47.801 |
| 250 | 59.751 |
| 500 | 119.5 |
| 1,000 | 239.01 |
| 1,500 | 358.51 |
| 2,000 | 478.01 |
| 2,500 | 597.51 |
| 3,000 | 717.02 |
Formula and worked example
kilojoules = kilocalories × 4.184 (1 kilocalorie is 4.184 kJ (thermochemical)).
Convert 2,000 kilocalories to kilojoules: 2,000 × 4.184 = 8,368 kJ.
When you need this
Food labels in the UK, EU and Australia show energy in both kilojoules and kilocalories (food Calories). Converting helps compare products and track intake.
Questions people ask
How many kilojoules are in a kilocalorie?
One kilocalorie is 4.184 kilojoules. 1 kilocalorie is 4.184 kJ (thermochemical).
How do I convert kilocalories to kilojoules?
Multiply the number of kilocalories by 4.184.
What is 1,000 kcal in kJ?
1,000 kilocalories is 4,184 kilojoules.
How do I convert kilojoules back to kilocalories?
Multiply by 0.23900574: one kilojoule is 0.23900574 kilocalories.
Related conversions
How we calculate this
We use the standard published formula or definition for this calculation, and we show the working so you can check it. Source: NIST Special Publication 811, Guide for the Use of the International System of Units.
Spotted a mistake? Tell us and we'll check it. How we check our calculators