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Megajoules to Kilowatt Hours

Convert MJ to kWh quickly with this free online calculator. The page explains the conversion rule, gives practical examples and provides a quick reference table.

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CONVERTED RESULT—
Decimal places
CONVERSION RULE

1 MJ equals approximately 0.277778 kWh.

How to use the Megajoules to Kilowatt Hours

  1. Enter the number you want to convert.
  2. Confirm the source unit shown beside the input.
  3. Choose decimal precision if you need more or less detail.
  4. Read the converted result.
  5. Copy the result when you need to use it elsewhere.

How the conversion works

1 MJ equals approximately 0.277778 kWh.

For a simple fixed-factor conversion, the calculator multiplies the entered value by the stated factor. Temperature scales and certain specialized tools use their specific mathematical relationship instead.

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Common MJ to kWh conversions

MJkWh
1 MJ0.277778 kWh
2 MJ0.555556 kWh
5 MJ1.388889 kWh
10 MJ2.777778 kWh
20 MJ5.555556 kWh
50 MJ13.888889 kWh

Example

For example, entering 1 MJ gives approximately 0.277778 kWh using the rule above. Change the input to test your own value.

Frequently asked questions

The Megajoules to Kilowatt Hours converts a value from MJ to kWh using the conversion relationship described on this page.
Enter your value, review the source and destination units, choose the decimal precision and read or copy the result.
1 MJ equals approximately 0.277778 kWh.
Use enough precision for your purpose. Everyday estimates usually need fewer decimal places; technical work may require more.
It can be a useful reference calculation, but safety-critical, regulated, contractual or specialized work should be verified against the applicable authoritative standard.

Accuracy note: This calculator is a practical reference. For regulated, safety-critical or specialized work, verify the result against the applicable standard.

Page reviewed: August 24, 2026.