Kilojoules to Kilocalories

1 kJ = 0.2390057 kcal

Food packaging in Australia and New Zealand shows energy in kilojoules, and European labels list kJ alongside kcal. Converting kJ to kcal helps people used to counting Calories read those labels, track intake, and compare products from different countries.

From

When you need to convert kilojoules to kilocalories

Reading the energy content on an Australian or New Zealand food label
Tracking meals in a calorie-counting app using imported products
Interpreting energy values in scientific or engineering texts
Converting energy expenditure data from sports watches set to kJ

How to convert kilojoules to kilocalories

kcal = kJ × 0.2390057

Equivalently: kcal = kJ ÷ 4.184.

Example: 5 kJ = 1.195029 kcal

Common energy values in kJ

Kilojoules (kJ)	Kilocalories (kcal)
100 kJ	23.90057 kcal
500 kJ	119.5029 kcal
600 kJ	143.4034 kcal
1,000 kJ	239.0057 kcal
2,000 kJ	478.0115 kcal
4,000 kJ	956.0229 kcal
8,700 kJ	2,079.35 kcal
10,000 kJ	2,390.057 kcal

Tips for converting kilojoules to kilocalories

Divide kJ by 4.184 for kcal, or multiply by about 0.24 for a mental estimate within 1%.
On cycling power meters, work in kJ is close to food kcal burned only because human efficiency is roughly a quarter; that is a rule of thumb, not a unit conversion.
The result is in kilocalories, which is what US labels call Calories.

Kilojoules to Kilocalories conversion table

Kilojoules (kJ)	Kilocalories (kcal)
1 kJ	0.2390057 kcal
2 kJ	0.4780115 kcal
3 kJ	0.7170172 kcal
4 kJ	0.9560229 kcal
5 kJ	1.195029 kcal
6 kJ	1.434034 kcal
7 kJ	1.67304 kcal
8 kJ	1.912046 kcal
9 kJ	2.151052 kcal
10 kJ	2.390057 kcal
15 kJ	3.585086 kcal
20 kJ	4.780115 kcal
25 kJ	5.975143 kcal
30 kJ	7.170172 kcal
40 kJ	9.560229 kcal
50 kJ	11.95029 kcal
75 kJ	17.92543 kcal
100 kJ	23.90057 kcal
250 kJ	59.75143 kcal
500 kJ	119.5029 kcal
1,000 kJ	239.0057 kcal

About the units

Kilojoules: The kilojoule equals 1,000 joules. Food labels in Australia, the EU and other regions list energy in kJ.

Kilocalories: The kilocalorie, written "Calorie" on food labels, is the energy needed to heat 1 kg of water by 1 °C. This converter uses the thermochemical value of 4,184 joules.

Frequently asked questions

How many kilocalories are in 1 kilojoule?

1 kilojoule equals 0.2390057 kilocalories.

How many kilojoules are in 1 kilocalorie?

1 kilocalorie equals 4.184 kilojoules.

How do I convert kilojoules to kilocalories?

Use the formula kcal = kJ × 0.2390057. Equivalently, kcal = kJ ÷ 4.184.

What is 10 kilojoules in kilocalories?

10 kilojoules equals 2.390057 kilocalories.

Related conversions

Sources

Conversion factors use the exact definitions published by NIST and the BIPM, and are checked by automated tests against those definitions.

Last updated: October 17, 2026