Megajoule to Megawatt-Hour Converter

Energy Converter

27 units available

Decimals:

From

To

0.000278

1 MJ = 0.000278 MWh

Formula:

MWh = MJ × 0.0002777778

With your value: 1 MJ = 0.00027778 MWh

How big is that?

Everyday references on a logarithmic scale, all expressed in megajoule so you can sanity-check the result.

Heartbeat (1/1.0e+6 your value)0.00000100 MJ

AA battery charge (1/1.0e+2 your value)0.0100 MJ

Slice of bread (1/3.6 your value)0.280 MJ

Your value1.00 MJ

Daily food intake (8.4× your value)8.40 MJ

Litre of petrol (34× your value)34.2 MJ

Other Megajoule to Megawatt-Hour conversions

2 MJ to MWh 3 MJ to MWh 4 MJ to MWh 5 MJ to MWh 6 MJ to MWh 7 MJ to MWh 8 MJ to MWh

Megajoule to Megawatt-Hour Conversion Table

Megajoule (MJ)	Megawatt-Hour (MWh)
0.5	0.000139
1	0.000278
2	0.000556
5	0.001389
10	0.002778
15	0.004167
20	0.005556
25	0.006944
50	0.013889
100	0.027778
250	0.069444
500	0.138889
1000	0.277778

Megawatt-Hour to Megajoule Conversion Table

Megawatt-Hour (MWh)	Megajoule (MJ)
0.5	1,800
1	3,600
2	7,200
5	18,000
10	36,000
15	54,000
20	72,000
25	90,000
50	180,000
100	360,000
250	900,000
500	1,800,000
1000	3,600,000

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

Megajoule (MJ)

Energy

Exact conversion

Derived from the joule (1 J = 1 kg·m²/s²). Thermochemical and IT calories, BTU and kWh are exact defined multiples.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

Megawatt-Hour (MWh)

Energy

Exact conversion

Derived from the joule (1 J = 1 kg·m²/s²). Thermochemical and IT calories, BTU and kWh are exact defined multiples.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

How to Convert Megajoule to Megawatt-Hour

To convert from Megajoule (MJ) to Megawatt-Hour (MWh), multiply the value by 0.0002777778.

Formula: MWh = MJ × 0.0002777778

Reverse: MJ = MWh × 3,600

Step-by-Step Example

Start with your value in Megajoule. For example: 5 MJ
Multiply by the conversion factor: 5 x 0.0002777778
The result is: 0.001389 MWh

About Megajoule

The megajoule (MJ) is a unit of energy and work. One megajoule equals 1.000000 × 10^+6 joules. UnitConvertLab converts it against every other energy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: energy calculations, engineering and science, education.

About Megawatt-Hour

The megawatt-hour (MWh) is a unit of energy and work. One megawatt-hour equals 3.600000 × 10^+9 joules. UnitConvertLab converts it against every other energy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: energy calculations, engineering and science, education.

Frequently Asked Questions

How many Megawatt-Hour are in 1 Megajoule?

There are exactly 0.0002777778 Megawatt-Hour in 1 Megajoule. This means the conversion factor from Megajoule to Megawatt-Hour is 0.0002777778.

What is the formula to convert Megajoule to Megawatt-Hour?

The formula to convert Megajoule to Megawatt-Hour is: MWh = MJ × 0.0002777778. For example, to convert 10 Megajoule to Megawatt-Hour, you would multiply 10 by 0.0002777778.

What is a Megajoule?