Gigajoules to Watt-hours Conversion

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

Results in Watt-hours:
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1 GJ = 277,777.777778 Wh

How to Convert Gigajoules to Watt-hours

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

Since one gigajoule is equal to 277,777.777778 watt-hours, you can use this simple formula to convert:

watt-hours = gigajoules × 277,777.777778

The energy in watt-hours is equal to the gigajoules multiplied by 277,777.777778.

For example, here's how to convert 5 gigajoules to watt-hours using the formula above.
5 GJ = (5 × 277,777.777778) = 1,388,888.888889 Wh

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


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.


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]

Gigajoule to Watt-hour Conversion Table

Gigajoule measurements converted to watt-hours
Gigajoules Watt-hours
0.00001 GJ 2.7778 Wh
0.00002 GJ 5.5556 Wh
0.00003 GJ 8.3333 Wh
0.00004 GJ 11.11 Wh
0.00005 GJ 13.89 Wh
0.00006 GJ 16.67 Wh
0.00007 GJ 19.44 Wh
0.00008 GJ 22.22 Wh
0.00009 GJ 25 Wh
0.000001 GJ 0.277778 Wh
0.00001 GJ 2.7778 Wh
0.0001 GJ 27.78 Wh
0.001 GJ 277.78 Wh
0.01 GJ 2,778 Wh
0.1 GJ 27,778 Wh
1 GJ 277,778 Wh


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