Calories to Watt-hours converter

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

1 cal ≈ 0.00116222222222 Wh
1 Wh ≈ 860.420650096 cal

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

Definitions: 1 cal = 4.184 J; 1 Wh = 3600 J

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.

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.

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