Calorie Converter (kcal to kJ)

Enter an energy value and pick units — the conversion updates instantly.

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ValueFromTo

Show all units

How to use

Type a number in “Value” and choose the units to convert from and to. The page opens on kcal → kJ.
For imported food labeled only in kJ, convert kJ → kcal to compare it with labels that use Calories.
“Show all units” lists the same energy in joules, kWh and every other unit at once.
The page address keeps your value and units, so you can share the link as is.

How many kJ are in 1 kcal?

About 4.184 kJ. Divide kJ by 4.184 to get kcal, so 2,000 kJ is about 478 kcal.

Is a Calorie on a food label the same as a calorie?

A capital-C Calorie on US labels equals one kilocalorie. A lowercase calorie (cal) is a thousand times smaller.

Why do some labels show kJ and others kcal?

The US and Japan lead with Calories or kcal, the EU requires both kJ and kcal, and Australia, New Zealand and China mainly use kJ.