Unit Converters · Browser · Free

Kilojoules to Kilocalories

Enter an amount in kilojoules, pick the kind of calorie you want the answer in, and press Convert. The result appears in a card below the button.

What this converter does

It takes an energy amount written in kilojoules (kJ) and gives it back in kilocalories (kcal). One number field holds the kilojoules, and a select chooses which calorie the answer is counted in.

The choices are Thermochemical/food calorie (4.184 J), International calorie (4.1868 J), 15°C calorie (about 4.1855 J) and 20°C calorie (about 4.182 J). By definition 1 thermochemical calorie is 4.184 J and 1 international calorie is 4.1868 J, while the 15°C calorie is about 4.1855 J and the 20°C calorie about 4.182 J. A food calorie (Cal) is 1 kcal, that is 4184 J.

The amount is worked out when Convert is pressed, and the answer shows in a card below the button. Copy writes the result and its unit to the clipboard, Clear resets the form, and the whole calculation happens in the browser.

Kilojoules to kilocalories formula

Kilocalories = kilojoules × 0.239005736137667 for the thermochemical and food calorie. For the other choices the multiplier is 0.238845896627496 for the international calorie, 0.238920081232828 for the 15°C calorie and 0.239120038259206 for the 20°C calorie.

Reading the table: 10 kJ is about 2.39005736 kcal, 100 kJ is about 23.9005736 kcal and 1000 kJ is about 239.005736 kcal, all on the thermochemical and food calorie.