Gigajoule to Kilowatt-Hour Converter
Convert Gigajoule (GJ) to Kilowatt-Hour (kWh) instantly. 1 GJ = 277.777778 kWh.
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27 units available
1 GJ = 277.777778 kWh
Formula:
kWh = GJ × 277.7777777778With your value: 1 GJ = 277.77777778 kWh
How big is that?
Everyday references on a logarithmic scale, all expressed in gigajoule so you can sanity-check the result.
Other Gigajoule to Kilowatt-Hour conversions
Gigajoule to Kilowatt-Hour Conversion Table
| Gigajoule (GJ) | Kilowatt-Hour (kWh) |
|---|---|
| 0.5 | 138.888889 |
| 1 | 277.777778 |
| 2 | 555.555556 |
| 5 | 1,388.888889 |
| 10 | 2,777.777778 |
| 15 | 4,166.666667 |
| 20 | 5,555.555556 |
| 25 | 6,944.444444 |
| 50 | 13,888.888889 |
| 100 | 27,777.777778 |
| 250 | 69,444.444444 |
| 500 | 138,888.888889 |
| 1000 | 277,777.777778 |
Kilowatt-Hour to Gigajoule Conversion Table
| Kilowatt-Hour (kWh) | Gigajoule (GJ) |
|---|---|
| 0.5 | 0.0018 |
| 1 | 0.0036 |
| 2 | 0.0072 |
| 5 | 0.018 |
| 10 | 0.036 |
| 15 | 0.054 |
| 20 | 0.072 |
| 25 | 0.09 |
| 50 | 0.18 |
| 100 | 0.36 |
| 250 | 0.9 |
| 500 | 1.8 |
| 1000 | 3.6 |
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
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
Kilowatt-Hour (kWh)
Energy
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 Kilowatt-Hour
To convert from Gigajoule (GJ) to Kilowatt-Hour (kWh), multiply the value by 277.7777777778.
Formula: kWh = GJ × 277.7777777778
Reverse: GJ = kWh × 0.0036
Step-by-Step Example
- Start with your value in Gigajoule. For example: 5 GJ
- Multiply by the conversion factor: 5 x 277.7777777778
- The result is: 1,388.888889 kWh
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 Kilowatt-Hour
The kilowatt-hour is a unit of energy equal to 3.6 million joules, commonly used for electrical billing.
Common uses: electricity bills, energy consumption, appliances.
Frequently Asked Questions
How many Kilowatt-Hour are in 1 Gigajoule?
There are exactly 277.7777777778 Kilowatt-Hour in 1 Gigajoule. This means the conversion factor from Gigajoule to Kilowatt-Hour is 277.7777777778.
What is the formula to convert Gigajoule to Kilowatt-Hour?
The formula to convert Gigajoule to Kilowatt-Hour is: kWh = GJ × 277.7777777778. For example, to convert 10 Gigajoule to Kilowatt-Hour, you would multiply 10 by 277.7777777778.
What is a 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.
What is a Kilowatt-Hour?
The kilowatt-hour is a unit of energy equal to 3.6 million joules, commonly used for electrical billing.
What are the common uses of Gigajoule?
The Gigajoule is commonly used in energy calculations, engineering and science, education.
Related Energy Conversions
Cite this page
UnitConvertLab. (2026). Gigajoule to Kilowatt-Hour converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/gigajoule-to-kilowatt_hour