Joules to Megawatt-Hours Converter

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


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Result in Megawatt-Hours:

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1 J = 2.7778E-10 MWh
Hint: use a scientific notation calculator to convert E notation to decimal

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How to Convert Joules to Megawatt-Hours

To convert a measurement in joules to a measurement in megawatt-hours, divide the energy by the following conversion ratio: 3,600,000,000 joules/megawatt-hour.

Since one megawatt-hour is equal to 3,600,000,000 joules, you can use this simple formula to convert:

megawatt-hours = joules ÷ 3,600,000,000

The energy in megawatt-hours is equal to the energy in joules divided by 3,600,000,000.

For example, here's how to convert 5,000,000,000 joules to megawatt-hours using the formula above.
megawatt-hours = (5,000,000,000 J ÷ 3,600,000,000) = 1.388889 MWh

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

What Is a Joule?

The joule is the energy equal to the force on an object of one newton at a distance of one meter.[1] One joule is equal to the heat energy dissipated by the current of one ampere through one ohm of resistance for one second.

One joule is also equal to the energy needed to move an electric charge of one coulomb through a potential difference of one volt. In addition, one joule is also equal to the one watt-second.

The joule is the SI derived unit for energy in the metric system. Joules can be abbreviated as J; for example, 1 joule can be written as 1 J.

Learn more about joules.

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.

Joule to Megawatt-Hour Conversion Table

Table showing various joule measurements converted to megawatt-hours.
Joules Megawatt-hours
1 J 0.00000000027778 MWh
2 J 0.00000000055556 MWh
3 J 0.00000000083333 MWh
4 J 0.0000000011111 MWh
5 J 0.0000000013889 MWh
6 J 0.0000000016667 MWh
7 J 0.0000000019444 MWh
8 J 0.0000000022222 MWh
9 J 0.0000000025 MWh
10 J 0.0000000027778 MWh
100 J 0.000000027778 MWh
1,000 J 0.00000027778 MWh
10,000 J 0.0000027778 MWh
100,000 J 0.000027778 MWh
1,000,000 J 0.000278 MWh
10,000,000 J 0.002778 MWh
100,000,000 J 0.027778 MWh
1,000,000,000 J 0.277778 MWh
10,000,000,000 J 2.7778 MWh


  1. International Bureau of Weights and Measures, The International System of Units, 9th Edition, 2019,

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