Watt-hours to Gigajoules Conversion

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

Results in Gigajoules:
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1 Wh = 3.6E-6 GJ
Hint: use a scientific notation calculator to convert E notation to decimal

How to Convert Watt-hours to Gigajoules

To convert a watt-hour measurement to a gigajoule measurement, multiply the energy by the conversion ratio.

Since one watt-hour is equal to 3.6E-6 gigajoules, you can use this simple formula to convert:

gigajoules = watt-hours × 3.6E-6

The energy in gigajoules is equal to the watt-hours multiplied by 3.6E-6.

For example, here's how to convert 500,000 watt-hours to gigajoules using the formula above.
500,000 Wh = (500,000 × 3.6E-6) = 1.8 GJ

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


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]


One gigajoule is equal to 1,000,000,000 joules, which are 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 109. Gigajoules can be abbreviated as GJ; for example, 1 gigajoule can be written as 1 GJ.

Watt-hour to Gigajoule Conversion Table

Watt-hour measurements converted to gigajoules
Watt-hours Gigajoules
1 Wh 0.0000036 GJ
2 Wh 0.0000072 GJ
3 Wh 0.0000108 GJ
4 Wh 0.0000144 GJ
5 Wh 0.000018 GJ
6 Wh 0.0000216 GJ
7 Wh 0.0000252 GJ
8 Wh 0.0000288 GJ
9 Wh 0.0000324 GJ
10 Wh 0.000036 GJ
100 Wh 0.00036 GJ
1,000 Wh 0.0036 GJ
10,000 Wh 0.036 GJ
100,000 Wh 0.36 GJ
1,000,000 Wh 3.6 GJ


  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