Watt-Hours to Megajoules Converter

Enter the energy in watt-hours below to get the value converted to megajoules.


Result in Megajoules:

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1 Wh = 0.0036 MJ

Do you want to convert megajoules to watt-hours?

How to Convert Watt-Hours to Megajoules

To convert a measurement in watt-hours to a measurement in megajoules, multiply the energy by the following conversion ratio: 0.0036 megajoules/watt-hour.

Since one watt-hour is equal to 0.0036 megajoules, you can use this simple formula to convert:

megajoules = watt-hours × 0.0036

The energy in megajoules is equal to the energy in watt-hours multiplied by 0.0036.

For example, here's how to convert 500 watt-hours to megajoules using the formula above.
megajoules = (500 Wh × 0.0036) = 1.8 MJ

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

What Is a Watt-Hour?

The watt-hour is a measure of electrical energy equal to one watt of power over a one hour period.

Watt-hours are usually abbreviated as Wh, although the formally adopted expression is W·h. The abbreviation W h is also sometimes used. For example, 1 watt-hour can be written as 1 Wh, 1 W·h, or 1 W 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 watt-hours.

What Is a Megajoule?

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

The megajoule is a multiple of the joule, which is the SI derived unit for energy. In the metric system, "mega" is the prefix for millions, or 106. Megajoules can be abbreviated as MJ; for example, 1 megajoule can be written as 1 MJ.

Learn more about megajoules.

Watt-Hour to Megajoule Conversion Table

Table showing various watt-hour measurements converted to megajoules.
Watt-hours Megajoules
1 Wh 0.0036 MJ
2 Wh 0.0072 MJ
3 Wh 0.0108 MJ
4 Wh 0.0144 MJ
5 Wh 0.018 MJ
6 Wh 0.0216 MJ
7 Wh 0.0252 MJ
8 Wh 0.0288 MJ
9 Wh 0.0324 MJ
10 Wh 0.036 MJ
20 Wh 0.072 MJ
30 Wh 0.108 MJ
40 Wh 0.144 MJ
50 Wh 0.18 MJ
60 Wh 0.216 MJ
70 Wh 0.252 MJ
80 Wh 0.288 MJ
90 Wh 0.324 MJ
100 Wh 0.36 MJ
200 Wh 0.72 MJ
300 Wh 1.08 MJ
400 Wh 1.44 MJ
500 Wh 1.8 MJ
600 Wh 2.16 MJ
700 Wh 2.52 MJ
800 Wh 2.88 MJ
900 Wh 3.24 MJ
1,000 Wh 3.6 MJ


  1. Bureau International des Poids et Mesures, The International System of Units (SI), 9th edition, 2019, https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf

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