Kilowatt-hours to Gigajoules Converter
Enter the energy in kilowatt-hours below to convert it to gigajoules.
Convert Kilowatt-hours to Gigajoules
Enter a value in kilowatt-hours (kWh) to convert to gigajoules (GJ).
Kilowatt-hour to Gigajoule Conversion Table
Table showing various kilowatt-hour measurements converted to gigajoules. Click any preset value or arrow to load it into the converter.
How to Convert Kilowatt-hours to Gigajoules
To convert kilowatt-hours to gigajoules, multiply the energy by the following conversion ratio: 0.0036 gigajoules/kilowatt-hour.
Since one kilowatt-hour is equal to 0.0036 gigajoules, you can use this simple formula to convert:
The energy in gigajoules is equal to the energy in kilowatt-hours multiplied by 0.0036.
For example, here's how to convert 5 kilowatt-hours to gigajoules using the formula above.
How Many Gigajoules Are in a Kilowatt-hour?
There are 0.0036 gigajoules in a kilowatt-hour, which is why we use this value in the formula above.
Our kilowatt-hour to gigajoule calculator automatically converts your energy measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Kilowatt-hours and gigajoules are both units used to measure energy. Keep reading to learn more about each unit.
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). [1]
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.
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. [2]
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.
When converting energy between kilowatt-hours (kWh) and gigajoules (GJ), keep full floating-point precision (1 kWh = 0.0036 GJ; 1 GJ = 277.7777778 kWh) during intermediate calculations and round only the final gigajoule figure to match your instrument tolerance.
More Kilowatt-hour & Gigajoule Conversions
Need to calculate in the opposite direction? Use our gigajoules to kilowatt-hours calculator to switch your starting unit immediately. You can also explore related tools such as converting gigajoules to kilowatt-hours, converting kilowatt-hours to joules, or converting kilowatt-hours to btus.
Convert from Kilowatt-hours
Frequently Asked Questions
References
- [1]NIST CODATA StandardNIST CODATA (CODATA Energy & Thermodynamic Constants)·Energy Metrology Standard — Kilowatt-hours (kWh) to Gigajoules (GJ)
- [2]NIST SP 811 SpecificationNIST SP 811 (NIST SP 811 App. B.9 (Energy, Work & Heat))·Unit Specifications: Kilowatt-hour (kWh) & Gigajoule (GJ)
- [3]BIPM ReferenceBIPM (Derived SI Unit: Joule (J))·Conversion Factors & Mathematical Basis (kWh to GJ)