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Watt-hours to Kilojoules Converter

Convert watt-hours (Wh) to kilojoules (kJ), 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
3.6 kJ
joules (watt-seconds)
3,600 J
megajoules
0.0036 MJ
gigajoules
3.6 × 10⁻⁶ GJ
calories (thermochemical)
860.420650096 cal
kilocalories (food Calories)
0.860420650096 kcal
megacalories
0.000860420650096 Mcal
kilowatt-hours
0.001 kWh
megawatt-hours
1 × 10⁻⁶ MWh
British thermal units (IT)
3.41214163313 Btu
million Btu
3.41214163313 × 10⁻⁶ MMBtu
therms (100,000 Btu)
3.41214163313 × 10⁻⁵ thm
quads (10¹⁵ Btu)
3.41214163313 × 10⁻¹⁵ quad
electronvolts
2.24694326681 × 10²² eV
kiloelectronvolts
2.24694326681 × 10¹⁹ keV
megaelectronvolts
2.24694326681 × 10¹⁶ MeV

1 Wh = 3.6 kJ

Show the working
  1. 1 Wh = 3.6 kJ
  2. 1 × 3.6 = 3.6 kJ

How to convert watt-hours to kilojoules

1 Wh = 3.6 kJ, so multiply by 3.6 to go from watt-hours to kilojoules. Going the other way, 1 kJ = 0.277777777778 Wh.

kJ = Wh × 3.6
Wh = kJ × 0.277777777778

Worked example:

1 Wh = 3.6 kJ
5 × 3.6 = 18 kJ

Watt-hours to kilojoules table

Watt-hoursKilojoules
1 Wh3.6 kJ
2 Wh7.2 kJ
3 Wh10.8 kJ
4 Wh14.4 kJ
5 Wh18 kJ
6 Wh21.6 kJ
7 Wh25.2 kJ
8 Wh28.8 kJ
9 Wh32.4 kJ
10 Wh36 kJ
15 Wh54 kJ
20 Wh72 kJ
25 Wh90 kJ
30 Wh108 kJ
40 Wh144 kJ
50 Wh180 kJ
75 Wh270 kJ
100 Wh360 kJ
250 Wh900 kJ
500 Wh1,800 kJ
1000 Wh3,600 kJ

About the units

Formula version 0.1.0Reviewed