Gigajoule to Megawatt-Hour Converter

Energy Converter

27 units available

Decimals:

From

To

0.277778

1 GJ = 0.277778 MWh

Formula:

MWh = GJ × 0.2777777778

With your value: 1 GJ = 0.27777778 MWh

How big is that?

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

Heartbeat (1/1.0e+9 your value)1.00e-9 GJ

AA battery charge (1/1.0e+5 your value)0.0000100 GJ

Slice of bread (1/3.6e+3 your value)0.000280 GJ

Daily food intake (1/1.2e+2 your value)0.00840 GJ

Litre of petrol (1/29 your value)0.0342 GJ

Your value1.00 GJ

Other Gigajoule to Megawatt-Hour conversions

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

Gigajoule to Megawatt-Hour Conversion Table

Gigajoule (GJ)	Megawatt-Hour (MWh)
0.5	0.138889
1	0.277778
2	0.555556
5	1.388889
10	2.777778
15	4.166667
20	5.555556
25	6.944444
50	13.888889
100	27.777778
250	69.444444
500	138.888889
1000	277.777778

Megawatt-Hour to Gigajoule Conversion Table

Megawatt-Hour (MWh)	Gigajoule (GJ)
0.5	1.8
1	3.6
2	7.2
5	18
10	36
15	54
20	72
25	90
50	180
100	360
250	900
500	1,800
1000	3,600

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.

Gigajoule (GJ)

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 Gigajoule to Megawatt-Hour

To convert from Gigajoule (GJ) to Megawatt-Hour (MWh), multiply the value by 0.2777777778.

Formula: MWh = GJ × 0.2777777778

Reverse: GJ = MWh × 3.6

Step-by-Step Example

Start with your value in Gigajoule. For example: 5 GJ
Multiply by the conversion factor: 5 x 0.2777777778
The result is: 1.388889 MWh

About Gigajoule

The gigajoule (GJ) is a unit of energy and work. One gigajoule equals 1.000000 × 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.

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 Gigajoule?

There are exactly 0.2777777778 Megawatt-Hour in 1 Gigajoule. This means the conversion factor from Gigajoule to Megawatt-Hour is 0.2777777778.

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

The formula to convert Gigajoule to Megawatt-Hour is: MWh = GJ × 0.2777777778. For example, to convert 10 Gigajoule to Megawatt-Hour, you would multiply 10 by 0.2777777778.

What is a Gigajoule?