Quick answer
kJ = kcal × 4.184. For example, 1800 kcal × 4.184 = 7,531.2 kJ.
Common daily targets in kcal and kJ
| Daily target | Working | kJ |
|---|---|---|
| 1,200 kcal | 1,200 × 4.184 | 5,020.8 kJ |
| 1,500 kcal | 1,500 × 4.184 | 6,276 kJ |
| 1,800 kcal | 1,800 × 4.184 | 7,531.2 kJ |
| 2,000 kcal | 2,000 × 4.184 | 8,368 kJ |
| 2,200 kcal | 2,200 × 4.184 | 9,204.8 kJ |
| 2,500 kcal | 2,500 × 4.184 | 10,460 kJ |
| 3,000 kcal | 3,000 × 4.184 | 12,552 kJ |
What does kcal mean?
kcal is the symbol for kilocalorie, the unit behind "calories" on food labels and diet apps. One kcal is 1,000 small calories (cal) and equals 4.184 kJ. This tool treats kcal, Calories and food calories as the same unit. If you are unsure whether your source uses cal or kcal, read kJ vs calories.
When to use this converter
Use it when a recipe, fitness app or diet plan gives energy in kcal but the labels you shop with list kJ. For a broader tool that also handles small calories and joules, use the calories to kJ converter.
Frequently asked questions
What is the kcal to kJ formula?
Multiply kcal by 4.184 to get kJ.
How many kJ is 1,500 kcal?
1,500 kcal is 6,276 kJ.
Last updated 11 Oct 2026. How we calculate.