What is a Watt-hour (Wh)?

A watt-hour (Wh) is a unit of energy equal to the power of one watt sustained for one hour, or 3,600 joules.

Definition

Symbol

Wh

Category

Energy

System

Metric

1 {unit} = {value} {otherUnit}

1 Watt-hour = 3600 Joule (J)

1 Watt-hour = 3.6 Kilojoule (kJ)

1 Watt-hour = 860.421 Calorie (cal)

1 Watt-hour = 0.860421 Kilocalorie (kcal)

1 Watt-hour = 0.001 Kilowatt-hour (kWh)

Common Uses

  • Battery capacity
  • Small appliance energy use
  • Solar panel output

Watt-hour Conversions

Related Units