Gigajoule to Watt-Hour Converter

Energy Converter

27 units available

Decimals:

From

To

277,777.777778

1 GJ = 277,777.777778 Wh

Formula:

Wh = GJ × 277,777.7777777778

With your value: 1 GJ = 277,777.77777778 Wh

How big is that?

Everyday references on a logarithmic scale, all expressed in gigajoule so you can sanity-check the result.

Heartbeat (1/1.0e+9 your value)1.00e-9 GJ

AA battery charge (1/1.0e+5 your value)0.0000100 GJ

Slice of bread (1/3.6e+3 your value)0.000280 GJ

Daily food intake (1/1.2e+2 your value)0.00840 GJ

Litre of petrol (1/29 your value)0.0342 GJ

Your value1.00 GJ

Other Gigajoule to Watt-Hour conversions

2 GJ to Wh 3 GJ to Wh 4 GJ to Wh 5 GJ to Wh 6 GJ to Wh 7 GJ to Wh 8 GJ to Wh

Gigajoule to Watt-Hour Conversion Table

Gigajoule (GJ)	Watt-Hour (Wh)
0.5	138,888.888889
1	277,777.777778
2	555,555.555556
5	1,388,888.888889
10	2,777,777.777778
15	4,166,666.666667
20	5,555,555.555556
25	6,944,444.444444
50	13,888,888.888889
100	27,777,777.777778
250	69,444,444.444444
500	138,888,888.888889
1000	277,777,777.777778

Watt-Hour to Gigajoule Conversion Table

Watt-Hour (Wh)	Gigajoule (GJ)
0.5	1.800000e-6
1	3.600000e-6
2	7.200000e-6
5	1.800000e-5
10	3.600000e-5
15	5.400000e-5
20	7.200000e-5
25	9.000000e-5
50	0.00018
100	0.00036
250	0.0009
500	0.0018
1000	0.0036

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

Gigajoule (GJ)

Energy

Exact conversion

Derived from the joule (1 J = 1 kg·m²/s²). Thermochemical and IT calories, BTU and kWh are exact defined multiples.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

Watt-Hour (Wh)

Energy

Exact conversion

Derived from the joule (1 J = 1 kg·m²/s²). Thermochemical and IT calories, BTU and kWh are exact defined multiples.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

How to Convert Gigajoule to Watt-Hour

To convert from Gigajoule (GJ) to Watt-Hour (Wh), multiply the value by 277,777.7777777778.

Formula: Wh = GJ × 277,777.7777777778

Reverse: GJ = Wh × 0.0000036

Step-by-Step Example

Start with your value in Gigajoule. For example: 5 GJ
Multiply by the conversion factor: 5 x 277,777.7777777778
The result is: 1,388,888.888889 Wh

About Gigajoule

The gigajoule (GJ) is a unit of energy and work. One gigajoule equals 1.000000 × 10^+9 joules. UnitConvertLab converts it against every other energy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: energy calculations, engineering and science, education.

About Watt-Hour

The watt-hour (Wh) is a unit of energy and work. One watt-hour equals 3600 joules. UnitConvertLab converts it against every other energy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: energy calculations, engineering and science, education.

Frequently Asked Questions

How many Watt-Hour are in 1 Gigajoule?

There are exactly 277,777.7777777778 Watt-Hour in 1 Gigajoule. This means the conversion factor from Gigajoule to Watt-Hour is 277,777.7777777778.

What is the formula to convert Gigajoule to Watt-Hour?

The formula to convert Gigajoule to Watt-Hour is: Wh = GJ × 277,777.7777777778. For example, to convert 10 Gigajoule to Watt-Hour, you would multiply 10 by 277,777.7777777778.

What is a Gigajoule?