Megajoule to Kilowatt-hour Converter

One Megajoule equals 0.2777777778 Kilowatt-hour (1 MJ = 0.2777777778 kWh). Multiply a Megajoule value by 0.2777777778 to get the equivalent in Kilowatt-hour. Use the calculator above for instant results, or follow the formula, worked examples, and reference table below.

Formula

kWh = MJ × 0.2777777778

Multiply the Megajoule value by 0.2777777778 to get the equivalent value in Kilowatt-hour.

Example Conversions

1 Megajoule (MJ)

0.2777777778 Kilowatt-hour (kWh)

5 Megajoule (MJ)

1.388888889 Kilowatt-hour (kWh)

10 Megajoule (MJ)

2.777777778 Kilowatt-hour (kWh)

25 Megajoule (MJ)

6.944444444 Kilowatt-hour (kWh)

100 Megajoule (MJ)

27.77777778 Kilowatt-hour (kWh)

Conversion Table

Common conversion values from Megajoule to Kilowatt-hour
Megajoule (MJ) Kilowatt-hour (kWh)
0.1 0.02777777778
0.5 0.1388888889
1 0.2777777778
2 0.5555555556
5 1.388888889
10 2.777777778
25 6.944444444
50 13.88888889
100 27.77777778
250 69.44444444
500 138.8888889
1000 277.7777778

How to Convert Manually

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

  1. Write down the value in Megajoule (MJ) that you want to convert.
  2. Multiply that value by 0.2777777778.
  3. For example, 10 Megajoule × 0.2777777778 = 2.777777778 Kilowatt-hour.
  4. Label the result as Kilowatt-hour (kWh).

Relative Size Comparison

1 Megajoule
1MJ
1 Kilowatt-hour3.6Megajoules
1kWh

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

About Megajoule and Kilowatt-hour

The megajoule is one million joules. Fuel energy density, gas billing in some countries, and crash test energies are quoted in megajoules. 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. One Megajoule equals 0.2777777778 Kilowatt-hour (1 MJ = 0.2777777778 kWh). Megajoule to Kilowatt-hour conversion comes up most often in fuel energy density figures and in natural gas billing, typically when figures need restating for electricity billing.

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 Megajoule equals 4.166666667 Kilowatt-hour.

15 MJ × 0.2777777778 = 4.166666667 kWh

FAQ

How do I convert Megajoule to Kilowatt-hour?

Multiply the Megajoule value by 0.2777777778 to get the equivalent value in Kilowatt-hour.

What is the formula for Megajoule to Kilowatt-hour?

The formula is kWh = MJ × 0.2777777778.

How many Kilowatt-hour are in 1 Megajoule?

1 Megajoule equals 0.2777777778 Kilowatt-hour.

Can I convert Kilowatt-hour back to Megajoule?

Yes. 1 Kilowatt-hour equals 3.6 Megajoule, and the related converter can reverse the calculation.

What are common names for Megajoule and Kilowatt-hour?

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

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