Gigajoules to Megawatt-Hours Converter

Enter the energy in gigajoules below to get the value converted to megawatt-hours.


Result in Megawatt-Hours:

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1 GJ = 0.277778 MWh

Do you want to convert megawatt-hours to gigajoules?

How to Convert Gigajoules to Megawatt-Hours

To convert a measurement in gigajoules to a measurement in megawatt-hours, multiply the energy by the following conversion ratio: 0.277778 megawatt-hours/gigajoule.

Since one gigajoule is equal to 0.277778 megawatt-hours, you can use this simple formula to convert:

megawatt-hours = gigajoules × 0.277778

The energy in megawatt-hours is equal to the energy in gigajoules multiplied by 0.277778.

For example, here's how to convert 5 gigajoules to megawatt-hours using the formula above.
megawatt-hours = (5 GJ × 0.277778) = 1.388889 MWh

How Many Megawatt-Hours Are in a Gigajoule?

There are 0.277778 megawatt-hours in a gigajoule, which is why we use this value in the formula above.

1 GJ = 0.277778 MWh

Gigajoules and megawatt-hours are both units used to measure energy. Keep reading to learn more about each unit of measure.

What Is a Gigajoule?

One gigajoule is equal to 1,000,000,000 joules, which is the energy equal to the force on an object of one newton at a distance of one meter.

The gigajoule is a multiple of the joule, which is the SI derived unit for energy. In the metric system, "giga" is the prefix for billions, or 109. Gigajoules can be abbreviated as GJ; for example, 1 gigajoule can be written as 1 GJ.

Learn more about gigajoules.

What Is a Megawatt-Hour?

A megawatt-hour is a measure of electrical energy equal to one megawatt, or 1,000,000 watts, of power over a one hour period. Megawatt-hours are a measure of electrical work performed over a period of time, and are often used as a way of measuring energy usage by electric companies.

Megawatt-hours are usually abbreviated as MWh, although the formally adopted expression is MW·h. The abbreviation MW h is also sometimes used. For example, 1 megawatt-hour can be written as 1 MWh, 1 MW·h, or 1 MW h.

In formal expressions, the centered dot (·) or space is used to separate units used to indicate multiplication in an expression and to avoid conflicting prefixes being misinterpreted as a unit symbol.[1]

Learn more about megawatt-hours.

Gigajoule to Megawatt-Hour Conversion Table

Table showing various gigajoule measurements converted to megawatt-hours.
Gigajoules Megawatt-hours
1 GJ 0.277778 MWh
2 GJ 0.555556 MWh
3 GJ 0.833333 MWh
4 GJ 1.1111 MWh
5 GJ 1.3889 MWh
6 GJ 1.6667 MWh
7 GJ 1.9444 MWh
8 GJ 2.2222 MWh
9 GJ 2.5 MWh
10 GJ 2.7778 MWh
11 GJ 3.0556 MWh
12 GJ 3.3333 MWh
13 GJ 3.6111 MWh
14 GJ 3.8889 MWh
15 GJ 4.1667 MWh
16 GJ 4.4444 MWh
17 GJ 4.7222 MWh
18 GJ 5 MWh
19 GJ 5.2778 MWh
20 GJ 5.5556 MWh
21 GJ 5.8333 MWh
22 GJ 6.1111 MWh
23 GJ 6.3889 MWh
24 GJ 6.6667 MWh
25 GJ 6.9444 MWh
26 GJ 7.2222 MWh
27 GJ 7.5 MWh
28 GJ 7.7778 MWh
29 GJ 8.0556 MWh
30 GJ 8.3333 MWh
31 GJ 8.6111 MWh
32 GJ 8.8889 MWh
33 GJ 9.1667 MWh
34 GJ 9.4444 MWh
35 GJ 9.7222 MWh
36 GJ 10 MWh
37 GJ 10.28 MWh
38 GJ 10.56 MWh
39 GJ 10.83 MWh
40 GJ 11.11 MWh


  1. Bureau International des Poids et Mesures, The International System of Units (SI), 9th edition, 2019,

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