Convert calories to kilojoules
1 cal = 0.004184 kJ. Change the amount below, or read the formula and the reference table further down.
1 calorie equals
kilojoules
1 cal = 0.004184 kJ
The formula
Calories and kilojoules both measure energy from the same zero, so a single multiplier does the job.
kJ = cal × 0.004184
Going the other way? Convert kilojoules to calories.
Calories to kilojoules table
Common values, rounded for reading.
| Calories (cal) | Kilojoules (kJ) |
|---|---|
| 1 | 0.004184 |
| 2 | 0.008368 |
| 3 | 0.012552 |
| 4 | 0.016736 |
| 5 | 0.02092 |
| 6 | 0.025104 |
| 7 | 0.029288 |
| 8 | 0.033472 |
| 9 | 0.037656 |
| 10 | 0.04184 |
| 15 | 0.06276 |
| 20 | 0.08368 |
| 25 | 0.1046 |
| 30 | 0.12552 |
| 40 | 0.16736 |
| 50 | 0.2092 |
| 75 | 0.3138 |
| 100 | 0.4184 |
| 250 | 1.046 |
| 500 | 2.092 |
| 1,000 | 4.184 |
Questions people ask
- How many kilojoules are in a calorie?
- One calorie equals 0.004184 kilojoules.
- How do I convert calories to kilojoules by hand?
- Multiply the number of calories by 0.004184. For a rough check, 0.004 is close enough for most everyday use.
- What is 1 calorie in kilojoules?
- 1 calorie is 0.004184 kilojoules.
Calcuit generates this page from a unit table, so the factors here match every other page on the site.