Kilocalorie to Kilojoule Converter
Convert Kilocalorie (kcal) to Kilojoule (kJ). Results update as you type, with a conversion table and the formula below.
1 kcal =
4.184 kJ
kcal to kJ conversion table
| kcal | 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 |
| kcal | kJ |
|---|---|
| 20 | 83.68 |
| 25 | 104.6 |
| 30 | 125.52 |
| 40 | 167.36 |
| 50 | 209.2 |
| 60 | 251.04 |
| 70 | 292.88 |
| 80 | 334.72 |
| 90 | 376.56 |
| 100 | 418.4 |
How to use
- Type the kcal value to convert.
- The result appears instantly in kJ; the swap button reverses direction.
- For common values, check the conversion table below.
Frequently asked questions
How many kJ is 1 kcal?+
1 kcal = 4.184 kJ. The table below lists the values you'll reach for most often.
How accurate are the results?+
The math uses internationally standardized definitions; only the display is rounded to significant digits. Accurate enough for school, work and daily life.
How do I convert kJ back to kcal?+
Hit the swap arrows in the middle of the converter above — the direction flips and your value is kept.
Is it really free?+
Yes. No sign-up, no install, no usage limits. The site is ad-supported.
Unit guide
The formula
1 kcal equals 4.184 kJ — multiply a kcal value by 4.184 to get kJ. Example: 5 kcal × 4.184 = 20.92 kJ.
Going the other way, 1 kJ = 0.239006 kcal — multiply by 0.239006, or hit the swap button on the converter above.
When is this conversion needed?
Useful for nutrition labels (kcal vs kJ), diet calorie counting and electricity or battery figures.