Watt-hours to Gigajoules Converter
Enter the energy in watt-hours below to convert it to gigajoules.
Convert Watt-hours to Gigajoules
Enter a value in watt-hours (Wh) to convert to gigajoules (GJ).
Watt-hour to Gigajoule Conversion Table
Table showing various watt-hour measurements converted to gigajoules. Click any preset value or arrow to load it into the converter.
| Watt-hours (Wh) | Gigajoules (GJ) |
|---|---|
| 1 Wh | 0.0000036 GJ |
| 10 Wh | 0.000036 GJ |
| 100 Wh | 0.00036 GJ |
| 1,000 Wh | 0.0036 GJ |
| 10,000 Wh | 0.036 GJ |
| 100,000 Wh | 0.36 GJ |
| 1,000,000 Wh | 3.6 GJ |
| 5,000,000 Wh | 18 GJ |
| 10,000,000 Wh | 36 GJ |
| 25,400,000 Wh | 91.44 GJ |
How to Convert Watt-hours to Gigajoules
To convert watt-hours to gigajoules, multiply the energy by the following conversion ratio: 0.0000036 gigajoules/watt-hour.
Since one watt-hour is equal to 0.0000036 gigajoules, you can use this simple formula to convert:
The energy in gigajoules is equal to the energy in watt-hours multiplied by 0.0000036.
For example, here's how to convert 5 watt-hours to gigajoules using the formula above.
How Many Gigajoules Are in a Watt-hour?
There are 0.0000036 gigajoules in a watt-hour, which is why we use this value in the formula above.
Our watt-hour to gigajoule calculator automatically converts your energy measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Watt-hours and gigajoules are both units used to measure energy. Keep reading to learn more about each unit.
What Is a Watt-hour?
A watt-hour is a unit of energy equal to 3,600 joules (J), the base unit for energy. Equal to 3,600 Joules. [1]
The watt-hour is classified as a metric and SI-compatible unit of energy. Watt-hours can be abbreviated as Wh; for example, 1 watt-hour can be written as 1 Wh.
When working with watt-hours (Wh) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, watt-hours (Wh) 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 watt-hours (Wh) and gigajoules (GJ), keep full floating-point precision (1 Wh = 0.0000036 GJ; 1 GJ = 277,777.7777778 Wh) during intermediate calculations and round only the final gigajoule figure to match your instrument tolerance.
More Watt-hour & Gigajoule Conversions
Need to calculate in the opposite direction? Use our gigajoules to watt-hours calculator to switch your starting unit immediately. You can also explore related tools such as converting gigajoules to watt-hours, converting watt-hours to ampere-hours, or converting joules to calories.
Convert from Watt-hours
Frequently Asked Questions
References
- [1]NIST CODATA StandardNIST CODATA (CODATA Energy & Thermodynamic Constants)·Energy Metrology Standard — Watt-hours (Wh) to Gigajoules (GJ)
- [2]NIST SP 811 SpecificationNIST SP 811 (NIST SP 811 App. B.9 (Energy, Work & Heat))·Unit Specifications: Watt-hour (Wh) & Gigajoule (GJ)
- [3]BIPM ReferenceBIPM (Derived SI Unit: Joule (J))·Conversion Factors & Mathematical Basis (Wh to GJ)