Kilowatt-hours to Megajoules Converter
Enter the energy in kilowatt-hours below to convert it to megajoules.
Convert Kilowatt-hours to Megajoules
Enter a value in kilowatt-hours (kWh) to convert to megajoules (MJ).
Kilowatt-hour to Megajoule Conversion Table
Table showing various kilowatt-hour measurements converted to megajoules. Click any preset value or arrow to load it into the converter.
How to Convert Kilowatt-hours to Megajoules
To convert kilowatt-hours to megajoules, multiply the energy by the following conversion ratio: 3.6 megajoules/kilowatt-hour.
Since one kilowatt-hour is equal to 3.6 megajoules, you can use this simple formula to convert:
The energy in megajoules is equal to the energy in kilowatt-hours multiplied by 3.6.
For example, here's how to convert 5 kilowatt-hours to megajoules using the formula above.
How Many Megajoules Are in a Kilowatt-hour?
There are 3.6 megajoules in a kilowatt-hour, which is why we use this value in the formula above.
Our kilowatt-hour to megajoule calculator automatically converts your energy measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Kilowatt-hours and megajoules 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 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 kilowatt-hours (kWh) and megajoules (MJ), keep full floating-point precision (1 kWh = 3.6 MJ; 1 MJ = 0.2777778 kWh) during intermediate calculations and round only the final megajoule figure to match your instrument tolerance.
More Kilowatt-hour & Megajoule Conversions
Need to calculate in the opposite direction? Use our megajoules to kilowatt-hours calculator to switch your starting unit immediately. You can also explore related tools such as converting megajoules 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 Megajoules (MJ)
- [2]NIST SP 811 SpecificationNIST SP 811 (NIST SP 811 App. B.9 (Energy, Work & Heat))·Unit Specifications: Kilowatt-hour (kWh) & Megajoule (MJ)
- [3]BIPM ReferenceBIPM (Derived SI Unit: Joule (J))·Conversion Factors & Mathematical Basis (kWh to MJ)