Kilowatt-hour to Megajoule Converter

One Kilowatt-hour equals 3.6 Megajoule (1 kWh = 3.6 MJ). Multiply a Kilowatt-hour value by 3.6 to get the equivalent in Megajoule. Use the calculator above for instant results, or follow the formula, worked examples, and reference table below.

Formula

MJ = kWh × 3.6

Multiply the Kilowatt-hour value by 3.6 to get the equivalent value in Megajoule.

Example Conversions

1 Kilowatt-hour (kWh)

3.6 Megajoule (MJ)

5 Kilowatt-hour (kWh)

18 Megajoule (MJ)

10 Kilowatt-hour (kWh)

36 Megajoule (MJ)

25 Kilowatt-hour (kWh)

90 Megajoule (MJ)

100 Kilowatt-hour (kWh)

360 Megajoule (MJ)

Conversion Table

Common conversion values from Kilowatt-hour to Megajoule
Kilowatt-hour (kWh) Megajoule (MJ)
0.1 0.36
0.5 1.8
1 3.6
2 7.2
5 18
10 36
25 90
50 180
100 360
250 900
500 1800
1000 3600

How to Convert Manually

Use these steps to convert Kilowatt-hour values to Megajoule without the calculator.

  1. Write down the value in Kilowatt-hour (kWh) that you want to convert.
  2. Multiply that value by 3.6.
  3. For example, 10 Kilowatt-hour × 3.6 = 36 Megajoule.
  4. Label the result as Megajoule (MJ).

Relative Size Comparison

1 Kilowatt-hour
1kWh
1 Megajoule0.2777777778Kilowatt-hours
1MJ

This chart shows the visual difference in size between exactly one Kilowatt-hour and one Megajoule.

About Kilowatt-hour and Megajoule

The kilowatt-hour is exactly 3.6 megajoules — the unit on your electricity bill. Household consumption and electric vehicle battery sizes are stated in kilowatt-hours. The megajoule is one million joules. Fuel energy density, gas billing in some countries, and crash test energies are quoted in megajoules. One Kilowatt-hour equals 3.6 Megajoule (1 kWh = 3.6 MJ). Kilowatt-hour to Megajoule conversion comes up most often in electricity billing and in electric vehicle battery capacity, typically when figures need restating for fuel energy density figures.

Precision and Rounding: Energy factors mix exact definitions (1 kWh = 3,600,000 J; 1 cal = 4.184 J thermochemical) with measured conventions (1 BTU ≈ 1,055.056 J). Nutrition and utility bills round to whole units; engineering heat calculations should keep the full factor until the final step.

Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).

Worked Example

15 Kilowatt-hour equals 54 Megajoule.

15 kWh × 3.6 = 54 MJ

FAQ

How do I convert Kilowatt-hour to Megajoule?

Multiply the Kilowatt-hour value by 3.6 to get the equivalent value in Megajoule.

What is the formula for Kilowatt-hour to Megajoule?

The formula is MJ = kWh × 3.6.

How many Megajoule are in 1 Kilowatt-hour?

1 Kilowatt-hour equals 3.6 Megajoule.

Can I convert Megajoule back to Kilowatt-hour?

Yes. 1 Megajoule equals 0.2777777778 Kilowatt-hour, and the related converter can reverse the calculation.

What are common names for Kilowatt-hour and Megajoule?

Kilowatt-hour is shown as kWh and may also be searched as kilowatt hour, kilowatt-hour, kwh. Megajoule is shown as MJ and may also be searched as megajoule, megajoules.

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