MJ to kJ Converter

How to convert megajoules to kilojoules

FormulakJ = MJ × 1,000

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

A megajoule is larger than a kilojoule: one megajoule contains 1,000 kilojoules.

Worked examples

1 megajoule1 MJ × 1,000 = 1,000 kJ
5 megajoules5 MJ × 1,000 = 5,000 kJ
10 megajoules10 MJ × 1,000 = 10,000 kJ
20 megajoules20 MJ × 1,000 = 20,000 kJ
100 megajoules100 MJ × 1,000 = 100,000 kJ

Megajoules to kilojoules conversion table

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

Megajoules to kilojoules: 0.1–10 MJ
Megajoules (MJ)	Kilojoules (kJ)
0.1 MJ	100 kJ
0.25 MJ	250 kJ
0.5 MJ	500 kJ
1 MJ	1,000 kJ
2 MJ	2,000 kJ
3 MJ	3,000 kJ
4 MJ	4,000 kJ
5 MJ	5,000 kJ
6 MJ	6,000 kJ
7 MJ	7,000 kJ
8 MJ	8,000 kJ
9 MJ	9,000 kJ
10 MJ	10,000 kJ

Megajoules to kilojoules: 12–1,000 MJ
Megajoules (MJ)	Kilojoules (kJ)
12 MJ	12,000 kJ
15 MJ	15,000 kJ
20 MJ	20,000 kJ
25 MJ	25,000 kJ
30 MJ	30,000 kJ
40 MJ	40,000 kJ
50 MJ	50,000 kJ
75 MJ	75,000 kJ
100 MJ	100,000 kJ
250 MJ	250,000 kJ
500 MJ	500,000 kJ
1,000 MJ	1,000,000 kJ

About the units

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).

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).

Frequently asked questions

How many kilojoules are in one megajoule?

There are 1,000 kilojoules in one megajoule, and this value is exact by definition.

How do I convert megajoules to kilojoules?

Multiply the number of megajoules by 1,000. For example, 10 MJ × 1,000 = 10,000 kJ.

How many megajoules are in one kilojoule?

One kilojoule equals 0.001 megajoules. That is the reverse factor, 1 ÷ 1,000.

What is 10 megajoules in kilojoules?

10 MJ = 10,000 kJ.

Is this MJ to kJ 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.