Watt-hours to Joules converter

To convert watt-hours to joules, enter the value in the first field. The result in joules is calculated automatically using the exact conversion factor.

1 Wh = 3600 J
1 J ≈ 0.000277777777778 Wh

Formula: J = Wh × 3600
Wh ≈ J × 0.000277777777778

Definitions: 1 Wh = 3600 J

The watt-hour (Wh) is the energy of one watt working for one hour, exactly 3,600 joules. It is used for the capacity of phone, laptop and power bank batteries and for small amounts of electricity.

The joule (J) is the SI unit of energy and work: the energy of one newton acting over one meter, or of one watt working for one second. It is a small unit, roughly the energy needed to lift a small apple by one meter.

See the conversion table with commonly used values, handy for quick reference or study.