How many kilocalories are in one kilojoule?

One kilojoule equals approximately 0.239006 kilocalories (kcal). Equivalently, 1 kcal = 4.184 kJ.

Are kilocalories the same as food Calories?

Yes. A food Calorie (capital C) is exactly one kilocalorie (kcal). Nutrition labels in most countries use kcal or simply "Calories" interchangeably.

Why do some food labels show kJ instead of kcal?

The European Union and several other countries require energy to be displayed in kilojoules (kJ) on food packaging, often alongside kcal. Both units measure the same energy — they just use different scales.

Is this converter accurate for nutrition calculations?

Yes. It uses the exact thermochemical conversion factor: 1 kcal = 4.184 kJ, which is the standard used in nutrition science and food labeling.

What is a typical daily energy intake in kJ?

A common guideline for adults is roughly 8,700 kJ per day (about 2,080 kcal), though individual needs vary by age, sex, weight, and activity level.

Kilojoules to Kilocalories Converter

Name: Kilojoules to Kilocalories Converter
Availability: InStock
Author: Nham Vu

Enter a value in kilojoules and instantly get the equivalent in kilocalories (food Calories).

Energy Conversion

Kilojoules (kJ)

Kilocalories (kcal / Cal)

Result

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Enter a value to convert

Conversion Reference

1 kJ 0.239006 kcal

1 kcal 4.184 kJ

100 kJ 23.9 kcal

500 kJ 119.5 kcal

1,000 kJ 239.0 kcal

8,700 kJ 2,079 kcal

Quick Examples

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Summary

Enter a value in kilojoules and instantly get the equivalent in kilocalories (food Calories).

How it works

Enter a value in kilojoules (kJ) in the input field.
The converter multiplies your value by 0.239006 to get kilocalories.
Results update instantly as you type.
Use the swap button to convert kilocalories back to kilojoules.
Common nutrition values are shown as quick reference examples.

Use cases

Read energy values on food labels that show kJ instead of kcal.
Plan meals and track daily calorie intake using kJ-based data.
Convert energy data between metric nutritional standards.
Compare energy content of foods listed in different units.
Calculate total daily energy expenditure from kJ-reported studies.

Frequently Asked Questions

Last updated: 2026-07-01 · Reviewed by Nham Vu