Convert kilocalories to kilojoules
1 kcal = 4.184 kJ. Change the amount below, or read the formula and the reference table further down.
1 kilocalorie equals
kilojoules
1 kcal = 4.184 kJ
The formula
Kilocalories and kilojoules both measure energy from the same zero, so a single multiplier does the job.
kJ = kcal × 4.184
Going the other way? Convert kilojoules to kilocalories.
Kilocalories to kilojoules table
Common values, rounded for reading.
| Kilocalories (kcal) | Kilojoules (kJ) |
|---|---|
| 1 | 4.184 |
| 2 | 8.368 |
| 3 | 12.552 |
| 4 | 16.736 |
| 5 | 20.92 |
| 6 | 25.104 |
| 7 | 29.288 |
| 8 | 33.472 |
| 9 | 37.656 |
| 10 | 41.84 |
| 15 | 62.76 |
| 20 | 83.68 |
| 25 | 104.6 |
| 30 | 125.52 |
| 40 | 167.36 |
| 50 | 209.2 |
| 75 | 313.8 |
| 100 | 418.4 |
| 250 | 1,046 |
| 500 | 2,092 |
| 1,000 | 4,184 |
Questions people ask
- How many kilojoules are in a kilocalorie?
- One kilocalorie equals 4.184 kilojoules.
- How do I convert kilocalories to kilojoules by hand?
- Multiply the number of kilocalories by 4.184. For a rough check, 4.2 is close enough for most everyday use.
- What is 1 kilocalorie in kilojoules?
- 1 kilocalorie is 4.184 kilojoules.
Calcuit generates this page from a unit table, so the factors here match every other page on the site.