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Watt-hours to Joules Converter

Convert watt-hours (Wh) to joules (watt-seconds) (J), 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
3,600 J
kilojoules
3.6 kJ
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 = 3,600 J

Show the working
  1. 1 Wh = 3600 J
  2. 1 × 3600 = 3600 J

How to convert watt-hours to joules

1 Wh = 3,600 J, so multiply by 3,600 to go from watt-hours to joules (watt-seconds). Going the other way, 1 J = 0.000277777777778 Wh.

J = Wh × 3,600
Wh = J × 0.000277777777778

Worked example:

1 Wh = 3600 J
5 × 3600 = 18000 J

Watt-hours to joules table

Watt-hoursJoules
1 Wh3,600 J
2 Wh7,200 J
3 Wh10,800 J
4 Wh14,400 J
5 Wh18,000 J
6 Wh21,600 J
7 Wh25,200 J
8 Wh28,800 J
9 Wh32,400 J
10 Wh36,000 J
15 Wh54,000 J
20 Wh72,000 J
25 Wh90,000 J
30 Wh108,000 J
40 Wh144,000 J
50 Wh180,000 J
75 Wh270,000 J
100 Wh360,000 J
250 Wh900,000 J
500 Wh1,800,000 J
1000 Wh3,600,000 J

About the units

Joules (J)
Joules (watt-seconds), a metric unit. Definition: BIPM SI Brochure, 9th edition (SI units, prefixes and units accepted for use with the SI).

Formula version 0.1.0Reviewed