Convert kilojoules to calories

1 kJ=239.006cal

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

You have

Equals

239.0057

Conversion formula

Forward

calories = kilojoules × 239.006

Reverse

kilojoules = calories × 0.004184

Example: 10 kJ × 239.006 = 2,390.06 cal.

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 →

Calorie

cal

The gram calorie (small calorie) equals 4.184 joules — the energy to raise 1 g of water by 1 °C. It is a scientific unit, distinct from the nutrition "Calorie" (kcal). Largely replaced by joules in modern science.

Real-world: Raising 1 g of water 1 °C: 1 cal. A 100 kcal snack = 100,000 small calories.

Read full calorie reference →

Kilojoule to Calorie conversion table

Common kilojoules to calories values for quick reference.

Kilojoule (kJ)	Calorie (cal)
1 kJ	239.006 cal
10 kJ	2,390.06 cal
100 kJ	23,900.57 cal
500 kJ	119,502.87 cal
1,000 kJ	239,005.74 cal
5,000 kJ	1,195,028.68 cal
10,000 kJ	2,390,057.36 cal
50,000 kJ	11,950,286.81 cal
100,000 kJ	23,900,573.61 cal
500,000 kJ	119,502,868.07 cal

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 calories in a kilojoule?

One kilojoule equals 239.006 calories.

How do I convert kilojoules to calories?

Multiply the kilojoule value by 239.006 to get the equivalent in calories.

What is 100 kilojoules in calories?

100 kilojoules equals 23,900.57 calories.

Is a kilojoule bigger than a calorie?

Yes. 1 kilojoule equals 239.006 calories, so one kilojoule is larger.

How to convert kilojoules to calories without a calculator?

Multiply by 239.01 for a quick estimate; use a calculator for precise results.

Related energy conversions

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