Energy Converter

Convert between chemical, electrical and physical energy units.

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Kilowatt-Hours to Megajoules Megajoules to Kilowatt-Hours Joules to Calories Kilocalories to Kilojoules British Thermal Units to Joules Watt-Hours to Joules

Formula

kWh = MJ × 0.2777777778

Example

Example: convert 500 megajoules to kilowatt-hours.

500 MJ = 138.88888889 kWh

Conversion table

megajoules (MJ) kilowatt-hours (kWh)
1 MJ 0.27777778 kWh
2 MJ 0.55555556 kWh
5 MJ 1.38888889 kWh
10 MJ 2.77777778 kWh
20 MJ 5.55555556 kWh
50 MJ 13.88888889 kWh
100 MJ 27.77777778 kWh

Explanation

These are both units.

How to convert megajoules to kilowatt-hours

  1. Start with the value in megajoules (MJ).
  2. Multiply it by 0.2777777778.
  3. The result is the measurement in kilowatt-hours (kWh).

Example: 500 MJ → 138.88888889 kWh

Frequently Asked Questions

How much is 500 megajoules in kilowatt-hours?

500 megajoules is about 138.889 kilowatt-hours.

How many kilowatt-hours is 1 megajoule?

1 megajoule equals 0.277777777778 kilowatt-hours.

How many megajoules is 1 kilowatt-hour?

1 kilowatt-hour equals 3.6 megajoules.

What is the difference between megajoules and kilowatt-hours?

Both measure energy in SI. The main difference is usually scale: some units are convenient for smaller values, while others are used to express larger values more practically.

Where are megajoules and kilowatt-hours used?

They are used in physics and engineering to measure work, energy, and heat; the most practical unit depends on the magnitude.

Why does 1 megajoule equal 0.277777777778 kilowatt-hours?

Because the units are defined with a fixed relationship. To convert megajoules to kilowatt-hours, multiply by that factor.