1 kcal to kj

Updated July 2026

1 kcal equals 4.184 kJ

1 kilocalorie = 4.184 kJ. That is how many kilojoules there are in 1 kilocalorie. Enter any value in the free energy converter to convert kilocalories to kilojoules (and every other unit) instantly — it runs privately in your browser.

Formula: Multiply by 4.184 — 1 kilocalorie = 4.184 kilojoules. So 1 × 4.184 = 4.184 kJ.

kcal to kj conversion table

kilocalorie (kcal)kilojoules (kJ)
0.25 kcal1.046 kJ
0.5 kcal2.092 kJ
0.75 kcal3.138 kJ
1 kcal4.184 kJ
1.25 kcal5.23 kJ
1.5 kcal6.276 kJ
1.75 kcal7.322 kJ

Frequently asked questions

How many kilojoules is 1 kilocalorie?
1 kilocalorie is 4.184 kilojoules. Multiply kcal by 4.184 to get kj.
What is 1 kcal to kj?
1 kilocalorie = 4.184 kJ.
How do you convert kcal to kj?
Multiply by 4.184 — 1 kilocalorie = 4.184 kilojoules. So 1 × 4.184 = 4.184 kJ.

Other kcal to kj conversions

Convert 1 kcal to other units