Megajoules to Kilowatt-hours Converter
Enter the energy in megajoules below to convert it to kilowatt-hours.
Convert Megajoules to Kilowatt-hours
Enter a value in megajoules (MJ) to convert to kilowatt-hours (kWh).
Megajoule to Kilowatt-hour Conversion Table
Table showing various megajoule measurements converted to kilowatt-hours. Click any preset value or arrow to load it into the converter.
| Megajoules (MJ) | Kilowatt-hours (kWh) |
|---|---|
| 1 MJ | 0.2777778 kWh |
| 2 MJ | 0.5555556 kWh |
| 2.5 MJ | 0.6944444 kWh |
| 5 MJ | 1.3888889 kWh |
| 10 MJ | 2.7777778 kWh |
| 15 MJ | 4.1666667 kWh |
| 20 MJ | 5.5555556 kWh |
| 25 MJ | 6.9444444 kWh |
| 30 MJ | 8.3333333 kWh |
| 50 MJ | 13.8888889 kWh |
How to Convert Megajoules to Kilowatt-hours
To convert megajoules to kilowatt-hours, multiply the energy by the following conversion ratio: 0.2777778 kilowatt-hours/megajoule.
Since one megajoule is equal to 0.2777778 kilowatt-hours, you can use this simple formula to convert:
The energy in kilowatt-hours is equal to the energy in megajoules multiplied by 0.2777778.
For example, here's how to convert 5 megajoules to kilowatt-hours using the formula above.
How Many Kilowatt-hours Are in a Megajoule?
There are 0.2777778 kilowatt-hours in a megajoule, which is why we use this value in the formula above.
Our megajoule to kilowatt-hour calculator automatically converts your energy measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Megajoules and kilowatt-hours are both units used to measure energy. Keep reading to learn more about each unit.
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. [1]
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.
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). [2]
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.
When converting energy between megajoules (MJ) and kilowatt-hours (kWh), keep full floating-point precision (1 MJ = 0.2777778 kWh; 1 kWh = 3.6 MJ) during intermediate calculations and round only the final kilowatt-hour figure to match your instrument tolerance.
More Megajoule & Kilowatt-hour Conversions
Need to calculate in the opposite direction? Use our kilowatt-hours to megajoules calculator to switch your starting unit immediately. You can also explore related tools such as converting kilowatt-hours to megajoules, converting btus to kilowatt-hours, or converting ampere-hours to kilowatt-hours.
Convert from Megajoules
Frequently Asked Questions
References
- [1]NIST CODATA StandardNIST CODATA (CODATA Energy & Thermodynamic Constants)·Energy Metrology Standard — Megajoules (MJ) to Kilowatt-hours (kWh)
- [2]NIST SP 811 SpecificationNIST SP 811 (NIST SP 811 App. B.9 (Energy, Work & Heat))·Unit Specifications: Megajoule (MJ) & Kilowatt-hour (kWh)
- [3]BIPM ReferenceBIPM (Derived SI Unit: Joule (J))·Conversion Factors & Mathematical Basis (MJ to kWh)