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Megajoules to Watt-hours Converter

Convert megajoules (MJ) to watt-hours (Wh), with the formula, a conversion table and exact factors.

Change the values and press Calculate to work out your own figures.

Enter an amount of energy, choose its unit and the unit you want. The answer is exact until it is shown, and the same value appears in every other unit.

A number, fraction (3/8), mixed number (1 1/2), scientific notation (2.5e6) or a simple sum such as 2*3.
The unit you want the answer in. Swap exchanges the two units.
Result
277.777777778 Wh
joules (watt-seconds)
1,000,000 J
kilojoules
1,000 kJ
gigajoules
0.001 GJ
calories (thermochemical)
239,005.736138 cal
kilocalories (food Calories)
239.005736138 kcal
megacalories
0.239005736138 Mcal
kilowatt-hours
0.277777777778 kWh
megawatt-hours
0.000277777777778 MWh
British thermal units (IT)
947.817120313 Btu
million Btu
0.000947817120313 MMBtu
therms (100,000 Btu)
0.00947817120313 thm
quads (10¹⁵ Btu)
9.47817120313 × 10⁻¹³ quad
electronvolts
6.24150907446 × 10²⁴ eV
kiloelectronvolts
6.24150907446 × 10²¹ keV
megaelectronvolts
6.24150907446 × 10¹⁸ MeV

1 MJ = 277.777777778 Wh

Show the working
  1. 1 MJ = 277.777777778 Wh
  2. 1 × 277.777777778 = 277.777777778 Wh

How to convert megajoules to watt-hours

1 MJ = 277.777777778 Wh, so multiply by 277.777777778 to go from megajoules to watt-hours. Going the other way, 1 Wh = 0.0036 MJ.

Wh = MJ × 277.777777778
MJ = Wh × 0.0036

Worked example:

1 MJ = 277.777777778 Wh
5 × 277.777777778 = 1388.88888889 Wh

Megajoules to watt-hours table

MegajoulesWatt-hours
1 MJ277.777777778 Wh
2 MJ555.555555556 Wh
3 MJ833.333333333 Wh
4 MJ1,111.11111111 Wh
5 MJ1,388.88888889 Wh
6 MJ1,666.66666667 Wh
7 MJ1,944.44444444 Wh
8 MJ2,222.22222222 Wh
9 MJ2,500 Wh
10 MJ2,777.77777778 Wh
15 MJ4,166.66666667 Wh
20 MJ5,555.55555556 Wh
25 MJ6,944.44444444 Wh
30 MJ8,333.33333333 Wh
40 MJ11,111.1111111 Wh
50 MJ13,888.8888889 Wh
75 MJ20,833.3333333 Wh
100 MJ27,777.7777778 Wh
250 MJ69,444.4444444 Wh
500 MJ138,888.888889 Wh
1000 MJ277,777.777778 Wh

About the units

Formula version 0.1.0Reviewed