Gigajoules to Kilowatt-hours Converter
Enter the energy in gigajoules below to convert it to kilowatt-hours.
Convert Gigajoules to Kilowatt-hours
Enter a value in gigajoules (GJ) to convert to kilowatt-hours (kWh).
Gigajoule to Kilowatt-hour Conversion Table
Table showing various gigajoule measurements converted to kilowatt-hours. Click any preset value or arrow to load it into the converter.
| Gigajoules (GJ) | Kilowatt-hours (kWh) |
|---|---|
| 1 GJ | 277.7777778 kWh |
| 2 GJ | 555.5555556 kWh |
| 2.5 GJ | 694.4444444 kWh |
| 5 GJ | 1,388.8888889 kWh |
| 10 GJ | 2,777.7777778 kWh |
| 15 GJ | 4,166.6666667 kWh |
| 20 GJ | 5,555.5555556 kWh |
| 25 GJ | 6,944.4444444 kWh |
| 30 GJ | 8,333.3333333 kWh |
| 50 GJ | 13,888.8888889 kWh |
How to Convert Gigajoules to Kilowatt-hours
To convert gigajoules to kilowatt-hours, multiply the energy by the following conversion ratio: 277.7777778 kilowatt-hours/gigajoule.
Since one gigajoule is equal to 277.7777778 kilowatt-hours, you can use this simple formula to convert:
The energy in kilowatt-hours is equal to the energy in gigajoules multiplied by 277.7777778.
For example, here's how to convert 5 gigajoules to kilowatt-hours using the formula above.
How Many Kilowatt-hours Are in a Gigajoule?
There are 277.7777778 kilowatt-hours in a gigajoule, which is why we use this value in the formula above.
Our gigajoule to kilowatt-hour calculator automatically converts your energy measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Gigajoules and kilowatt-hours are both units used to measure energy. Keep reading to learn more about each unit.
What Is a Gigajoule?
A gigajoule is a unit of energy equal to 1,000,000,000 joules (J), the base unit for energy. Equal to 1,000,000,000 Joules, common in natural gas billing. [1]
The gigajoule is classified as an International System of Units (SI) unit of energy. Gigajoules can be abbreviated as GJ; for example, 1 gigajoule can be written as 1 GJ.
In the metric system, "giga" is the standard SI prefix for billions, or 10⁹. This makes the gigajoule (GJ) a convenient decimal multiple of the joule (J).
In practice, gigajoules (GJ) are widely used across large-scale industrial, bulk, and macro-level energy specifications within International System of Units (SI) workflows, engineering documentation, and technical data sheets.
What Is a Kilowatt-hour?
A kilowatt-hour is a unit of energy equal to 3,600,000 joules (J), the base unit for energy. Equal to 3.6 Megajoules (1,000 Wh). [2]
The kilowatt-hour is classified as a metric and SI-compatible unit of energy. Kilowatt-hours can be abbreviated as kWh; for example, 1 kilowatt-hour can be written as 1 kWh.
In the metric system, "kilo" is the standard SI prefix for thousands, or 10³. This makes the kilowatt-hour (kWh) a convenient decimal multiple of the joule (J).
In practice, kilowatt-hours (kWh) are widely used across large-scale industrial, bulk, and macro-level energy specifications within SI metric workflows, engineering documentation, and technical data sheets.
When converting energy between gigajoules (GJ) and kilowatt-hours (kWh), keep full floating-point precision (1 GJ = 277.7777778 kWh; 1 kWh = 0.0036 GJ) during intermediate calculations and round only the final kilowatt-hour figure to match your instrument tolerance.
More Gigajoule & Kilowatt-hour Conversions
Need to calculate in the opposite direction? Use our kilowatt-hours to gigajoules calculator to switch your starting unit immediately. You can also explore related tools such as converting kilowatt-hours to gigajoules, converting btus to kilowatt-hours, or converting ampere-hours to kilowatt-hours.
Convert from Gigajoules
Frequently Asked Questions
References
- [1]NIST CODATA StandardNIST CODATA (CODATA Energy & Thermodynamic Constants)·Energy Metrology Standard — Gigajoules (GJ) to Kilowatt-hours (kWh)
- [2]NIST SP 811 SpecificationNIST SP 811 (NIST SP 811 App. B.9 (Energy, Work & Heat))·Unit Specifications: Gigajoule (GJ) & Kilowatt-hour (kWh)
- [3]BIPM ReferenceBIPM (Derived SI Unit: Joule (J))·Conversion Factors & Mathematical Basis (GJ to kWh)