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Kilojoules to Calories Converter

Convert kilojoule to calorie instantly. Type a value below — the result updates as you type.

When you need to convert kilojoule to calorie

Energy conversions appear on nutrition labels, utility bills and appliance specs, letting you compare food energy, electricity use and heating output on a common scale.

Typical values: 0.5 kJ is about 119.5029 cal, and 5 kJ works out to roughly 1195.03 cal. Because the ratio is fixed at 239.0057, you can scale any amount linearly — doubling the kilojoules doubles the calories.

Food packaging, power meters and heating equipment each prefer different energy units, so converting makes them directly comparable.

How to convert kilojoule to calorie

One kilojoule equals 239.0057 calories. To convert, multiply the number of kilojoules by 239.0057:

calories = kilojoules × 239.0057

For example, 10 kilojoules × 239.0057 = 2390.06 calories.

Kilojoules to calories conversion table

Energy (kJ)Calories (cal)
1 kJ239.0057 cal
2 kJ478.0115 cal
3 kJ717.0172 cal
5 kJ1195.03 cal
10 kJ2390.06 cal
20 kJ4780.11 cal
50 kJ11950.3 cal
100 kJ23900.6 cal

FAQ

How many calories are in a kilojoule?

One kilojoule = 239.0057 calories.

How do I convert calories back to kilojoules?

Divide by 239.0057, or use the calories to kilojoules converter.

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