Joules to MJ Converter

How to convert joules to megajoules

FormulaMJ = J × 0.000001

Multiply the value in joules by 0.000001. To go the other way, multiply by 1,000,000 (or divide by 0.000001).

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

Worked examples

1 joule1 J × 0.000001 = 0.000001 MJ
5 joules5 J × 0.000001 = 0.000005 MJ
10 joules10 J × 0.000001 = 0.00001 MJ
20 joules20 J × 0.000001 = 0.00002 MJ
100 joules100 J × 0.000001 = 0.0001 MJ

Joules to megajoules conversion table

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

Joules to megajoules: 0.1–10 J
Joules (J)	Megajoules (MJ)
0.1 J	1×10⁻⁷ MJ
0.25 J	2.5×10⁻⁷ MJ
0.5 J	5×10⁻⁷ MJ
1 J	0.000001 MJ
2 J	0.000002 MJ
3 J	0.000003 MJ
4 J	0.000004 MJ
5 J	0.000005 MJ
6 J	0.000006 MJ
7 J	0.000007 MJ
8 J	0.000008 MJ
9 J	0.000009 MJ
10 J	0.00001 MJ

Joules to megajoules: 12–1,000 J
Joules (J)	Megajoules (MJ)
12 J	0.000012 MJ
15 J	0.000015 MJ
20 J	0.00002 MJ
25 J	0.000025 MJ
30 J	0.00003 MJ
40 J	0.00004 MJ
50 J	0.00005 MJ
75 J	0.000075 MJ
100 J	0.0001 MJ
250 J	0.00025 MJ
500 J	0.0005 MJ
1,000 J	0.001 MJ

About the units

Joule (J)

The SI unit of energy: the work done by a force of one newton over one metre, or one watt for one second. Lifting an apple by one metre takes about 1 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 joule?

There are 0.000001 megajoules in one joule, and this value is exact by definition.

How do I convert joules to megajoules?

Multiply the number of joules by 0.000001. For example, 10 J × 0.000001 = 0.00001 MJ.

How many joules are in one megajoule?

One megajoule equals 1,000,000 joules. That is the reverse factor, 1 ÷ 0.000001.

What is 10 joules in megajoules?

10 J = 0.00001 MJ.

Is this J 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.