Watt-hours to Calories converter

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

1 Wh ≈ 860.420650096 cal
1 cal ≈ 0.00116222222222 Wh

Formula: cal ≈ Wh × 860.420650096
Wh ≈ cal × 0.00116222222222

Definitions: 1 Wh = 3600 J; 1 cal = 4.184 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 calorie (cal) here is the thermochemical calorie, exactly 4.184 joules, roughly the energy needed to raise one gram of water by one degree Celsius. It is used in chemistry and physics and should not be confused with the food Calorie, which is a kilocalorie.

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