Megawatt-hours to Megajoules Converter
Enter the energy in megawatt-hours below to convert it to megajoules.
Convert Megawatt-hours to Megajoules
Enter a value in megawatt-hours (MWh) to convert to megajoules (MJ).
Megawatt-hour to Megajoule Conversion Table
Table showing various megawatt-hour measurements converted to megajoules. Click any preset value or arrow to load it into the converter.
| Megawatt-hours (MWh) | Megajoules (MJ) |
|---|---|
| 1 MWh | 3,600 MJ |
| 2 MWh | 7,200 MJ |
| 2.5 MWh | 9,000 MJ |
| 5 MWh | 18,000 MJ |
| 10 MWh | 36,000 MJ |
| 15 MWh | 54,000 MJ |
| 20 MWh | 72,000 MJ |
| 25 MWh | 90,000 MJ |
| 30 MWh | 108,000 MJ |
| 50 MWh | 180,000 MJ |
How to Convert Megawatt-hours to Megajoules
To convert megawatt-hours to megajoules, multiply the energy by the following conversion ratio: 3,600 megajoules/megawatt-hour.
Since one megawatt-hour is equal to 3,600 megajoules, you can use this simple formula to convert:
The energy in megajoules is equal to the energy in megawatt-hours multiplied by 3,600.
For example, here's how to convert 5 megawatt-hours to megajoules using the formula above.
How Many Megajoules Are in a Megawatt-hour?
There are 3,600 megajoules in a megawatt-hour, which is why we use this value in the formula above.
Our megawatt-hour to megajoule calculator automatically converts your energy measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Megawatt-hours and megajoules 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 Megajoule?
A megajoule is a unit of energy equal to 1,000,000 joules (J), the base unit for energy. Equal to 1,000,000 Joules. [2]
The megajoule is classified as an International System of Units (SI) unit of energy. Megajoules can be abbreviated as MJ; for example, 1 megajoule can be written as 1 MJ.
In the metric system, "mega" is the standard SI prefix for millions, or 10⁶. This makes the megajoule (MJ) a convenient decimal multiple of the joule (J).
In practice, megajoules (MJ) 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 megajoules (MJ), keep full floating-point precision (1 MWh = 3,600 MJ; 1 MJ = 0.000277778 MWh) during intermediate calculations and round only the final megajoule figure to match your instrument tolerance.
More Megawatt-hour & Megajoule Conversions
Need to calculate in the opposite direction? Use our megajoules to megawatt-hours calculator to switch your starting unit immediately. You can also explore related tools such as converting megajoules to megawatt-hours, converting joules to calories, or converting calories to joules.
Convert from Megawatt-hours
Frequently Asked Questions
References
- [1]NIST CODATA StandardNIST CODATA (CODATA Energy & Thermodynamic Constants)·Energy Metrology Standard — Megawatt-hours (MWh) to Megajoules (MJ)
- [2]NIST SP 811 SpecificationNIST SP 811 (NIST SP 811 App. B.9 (Energy, Work & Heat))·Unit Specifications: Megawatt-hour (MWh) & Megajoule (MJ)
- [3]BIPM ReferenceBIPM (Derived SI Unit: Joule (J))·Conversion Factors & Mathematical Basis (MWh to MJ)