Convert kilojoules to kilocalories

1 kJ=0.239kcal

Use the converter below to change any kilojoules value into kilocalories instantly — with formula, conversion table, and real-world examples.

You have

Equals

0.23901

Conversion formula

Forward

kilocalories = kilojoules × 0.239

Reverse

kilojoules = kilocalories × 4.184

Example: 10 kJ × 0.239 = 2.39006 kcal.

About both units

From

Kilojoule

The kilojoule equals 1000 joules. Used on European nutrition labels (required by EU law alongside kcal), for mechanical work specifications, and some engineering contexts. A 100 g chocolate bar contains about 2100 kJ.

Real-world: 100 g chocolate: ~2100 kJ. EU daily intake (adult): ~8400 kJ. Tesla Model 3 battery: ~270 MJ = 270,000 kJ.

Read full kilojoule reference →

Kilocalorie

kcal

The kilocalorie equals 1000 small calories or 4184 joules. This is the nutrition "Calorie" (capital C in some US labels). EU and UK labels always say kcal; US labels say Calories. Adult daily intake is about 2000 kcal.

Real-world: Adult daily intake: ~2000 kcal. Banana: 90 kcal. Big Mac: 550 kcal. 30 min running: ~300 kcal burned.

Read full kilocalorie reference →

Kilojoule to Kilocalorie conversion table

Common kilojoules to kilocalories values for quick reference.

Kilojoule (kJ)	Kilocalorie (kcal)
1 kJ	0.239 kcal
10 kJ	2.39006 kcal
100 kJ	23.9006 kcal
500 kJ	119.503 kcal
1,000 kJ	239.006 kcal
5,000 kJ	1,195.03 kcal
10,000 kJ	2,390.06 kcal
50,000 kJ	11,950.29 kcal
100,000 kJ	23,900.57 kcal
500,000 kJ	119,502.87 kcal

Tips & common mistakes

Quick tips

1 kJ = 1000 J = 0.239 kcal.
EU nutrition labels must show both kJ and kcal.
For quick conversion: kcal × 4.2 = kJ.

Avoid these

Assuming European labels use kcal only — they use both kJ and kcal.
Confusing kJ with kW (power).
Using kcal when kJ is requested in scientific context.

Frequently asked questions

How many kilocalories in a kilojoule?

One kilojoule equals 0.239 kilocalories.

How do I convert kilojoules to kilocalories?

Multiply the kilojoule value by 0.239 to get the equivalent in kilocalories.

What is 100 kilojoules in kilocalories?

100 kilojoules equals 23.9006 kilocalories.

Is a kilojoule bigger than a kilocalorie?

No. 1 kilojoule equals 0.239 kilocalories, so one kilojoule is smaller.

How to convert kilojoules to kilocalories without a calculator?

Multiply by 0.24 for a quick estimate; use a calculator for precise results.

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