Megawatt-hours to Gigajoules Converter
Enter the energy in megawatt-hours below to convert it to gigajoules.
Convert Megawatt-hours to Gigajoules
Enter a value in megawatt-hours (MWh) to convert to gigajoules (GJ).
Megawatt-hour to Gigajoule Conversion Table
Table showing various megawatt-hour measurements converted to gigajoules. Click any preset value or arrow to load it into the converter.
How to Convert Megawatt-hours to Gigajoules
To convert megawatt-hours to gigajoules, multiply the energy by the following conversion ratio: 3.6 gigajoules/megawatt-hour.
Since one megawatt-hour is equal to 3.6 gigajoules, you can use this simple formula to convert:
The energy in gigajoules is equal to the energy in megawatt-hours multiplied by 3.6.
For example, here's how to convert 5 megawatt-hours to gigajoules using the formula above.
How Many Gigajoules Are in a Megawatt-hour?
There are 3.6 gigajoules in a megawatt-hour, which is why we use this value in the formula above.
Our megawatt-hour to gigajoule calculator automatically converts your energy measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Megawatt-hours and gigajoules are both units used to measure energy. Keep reading to learn more about each unit.
What Is a Megawatt-hour?
A megawatt-hour is a unit of energy equal to 3,600,000,000 joules (J), the base unit for energy. Equal to 1,000 kilowatt-hours (3.6 Gigajoules). [1]
The megawatt-hour is classified as a metric and SI-compatible unit of energy. Megawatt-hours can be abbreviated as MWh; for example, 1 megawatt-hour can be written as 1 MWh.
In the metric system, "mega" is the standard SI prefix for millions, or 10⁶. This makes the megawatt-hour (MWh) a convenient decimal multiple of the joule (J).
In practice, megawatt-hours (MWh) 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 megawatt-hours (MWh) and gigajoules (GJ), keep full floating-point precision (1 MWh = 3.6 GJ; 1 GJ = 0.2777778 MWh) during intermediate calculations and round only the final gigajoule figure to match your instrument tolerance.
More Megawatt-hour & Gigajoule Conversions
Need to calculate in the opposite direction? Use our gigajoules to megawatt-hours calculator to switch your starting unit immediately. You can also explore related tools such as converting gigajoules to megawatt-hours, converting joules to calories, or converting calories to joules.
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Frequently Asked Questions
References
- [1]NIST CODATA StandardNIST CODATA (CODATA Energy & Thermodynamic Constants)·Energy Metrology Standard — Megawatt-hours (MWh) to Gigajoules (GJ)
- [2]NIST SP 811 SpecificationNIST SP 811 (NIST SP 811 App. B.9 (Energy, Work & Heat))·Unit Specifications: Megawatt-hour (MWh) & Gigajoule (GJ)
- [3]BIPM ReferenceBIPM (Derived SI Unit: Joule (J))·Conversion Factors & Mathematical Basis (MWh to GJ)