kJ to MJ Converter

How to convert kilojoules to megajoules

FormulaMJ = kJ × 0.001

Multiply the value in kilojoules by 0.001. To go the other way, multiply by 1,000 (or divide by 0.001).

A kilojoule is smaller than a megajoule: it takes 1,000 kilojoules to make one megajoule.

Worked examples

1 kilojoule1 kJ × 0.001 = 0.001 MJ
5 kilojoules5 kJ × 0.001 = 0.005 MJ
10 kilojoules10 kJ × 0.001 = 0.01 MJ
20 kilojoules20 kJ × 0.001 = 0.02 MJ
100 kilojoules100 kJ × 0.001 = 0.1 MJ

Kilojoules to megajoules conversion table

Values are calculated by the conversion engine and rounded to 8 significant figures.

Kilojoules to megajoules: 0.1–10 kJ
Kilojoules (kJ)	Megajoules (MJ)
0.1 kJ	0.0001 MJ
0.25 kJ	0.00025 MJ
0.5 kJ	0.0005 MJ
1 kJ	0.001 MJ
2 kJ	0.002 MJ
3 kJ	0.003 MJ
4 kJ	0.004 MJ
5 kJ	0.005 MJ
6 kJ	0.006 MJ
7 kJ	0.007 MJ
8 kJ	0.008 MJ
9 kJ	0.009 MJ
10 kJ	0.01 MJ

Kilojoules to megajoules: 12–1,000 kJ
Kilojoules (kJ)	Megajoules (MJ)
12 kJ	0.012 MJ
15 kJ	0.015 MJ
20 kJ	0.02 MJ
25 kJ	0.025 MJ
30 kJ	0.03 MJ
40 kJ	0.04 MJ
50 kJ	0.05 MJ
75 kJ	0.075 MJ
100 kJ	0.1 MJ
250 kJ	0.25 MJ
500 kJ	0.5 MJ
1,000 kJ	1 MJ

About the units

Kilojoule (kJ)

One thousand joules. Food labels in Australia and the EU list energy in kJ alongside kcal. One kilojoule equals 1,000 joules (J).

Megajoule (MJ)

The megajoule (MJ) is a unit of energy in the International System of Units (SI). One megajoule equals 1,000,000 joules (J).

Frequently asked questions

How many megajoules are in one kilojoule?

There are 0.001 megajoules in one kilojoule, and this value is exact by definition.

How do I convert kilojoules to megajoules?

Multiply the number of kilojoules by 0.001. For example, 10 kJ × 0.001 = 0.01 MJ.

How many kilojoules are in one megajoule?

One megajoule equals 1,000 kilojoules. That is the reverse factor, 1 ÷ 0.001.

What is 10 kilojoules in megajoules?

10 kJ = 0.01 MJ.

Is this kJ to MJ converter accurate?

Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.