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Megajoules to Watt-hours

Convert megajoules (MJ) to watt-hours (Wh). Type in either box; the other updates as you go.

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1 MJ = 277.77778 Wh

1 megajoule equals277.7777778 Wh
1 watt-hour equals0.0036 MJ
FormulaWh = MJ × 277.7777778

How to convert megajoules to watt-hours

To convert megajoules to watt-hours, multiply the number of megajoules by 277.7777778.

Wh = MJ × 277.7777778

Example

Convert 5 megajoules to watt-hours:

5 MJ × 277.7777778 = 1,388.89 Wh

Megajoule to watt-hour conversion chart

Megajoules (MJ)Watt-hours (Wh)
1 MJ277.7778 Wh
2 MJ555.5556 Wh
3 MJ833.3333 Wh
4 MJ1,111.111 Wh
5 MJ1,388.889 Wh
6 MJ1,666.667 Wh
7 MJ1,944.444 Wh
8 MJ2,222.222 Wh
9 MJ2,500 Wh
10 MJ2,777.778 Wh
12 MJ3,333.333 Wh
15 MJ4,166.667 Wh
20 MJ5,555.556 Wh
25 MJ6,944.444 Wh
30 MJ8,333.333 Wh
40 MJ11,111.11 Wh
50 MJ13,888.89 Wh
60 MJ16,666.67 Wh
70 MJ19,444.44 Wh
75 MJ20,833.33 Wh
80 MJ22,222.22 Wh
90 MJ25,000 Wh
100 MJ27,777.78 Wh
150 MJ41,666.67 Wh
200 MJ55,555.56 Wh
250 MJ69,444.44 Wh
500 MJ138,888.9 Wh
1,000 MJ277,777.8 Wh

Going the other way? See the watt-hours to megajoules chart.

About the units

Megajoule (MJ)

A megajoule is 1,000,000 joules, about the kinetic energy of a one-tonne car at 160 km/h.

Watt-hour (Wh)

A watt-hour is the energy of one watt for one hour, 3,600 joules. Batteries are rated in watt-hours.

Frequently asked questions

How many watt-hours are in a megajoule?

There are 277.7777778 watt-hours in a megajoule.

How many megajoules are in a watt-hour?

There are 0.0036 megajoules in a watt-hour.

How do you convert megajoules to watt-hours?

To convert megajoules to watt-hours, multiply the number of megajoules by 277.7777778.

What is 5 megajoules in watt-hours?

5 megajoules equals 1,388.89 watt-hours.

Convert between joules, calories, kilocalories, kilowatt-hours and BTU. Open the energy converter to see a value in every unit at once.