Watt-hours (W·h) to Calories (cal) Conversion
Watt-hours
The watt-hour (W·h) is a unit of energy equal to exactly 3,600 joules, defined as the energy consumed by a one-watt device operating for one hour. It is used in electrical engineering and consumer electronics for expressing battery capacities: a smartphone battery typically holds 10–20 Wh. In aviation, aircraft battery capacities are specified in watt-hours for international transport regulations (lithium batteries above 100 Wh face restrictions).
Calories
The calorie (cal) is a unit of energy equal to exactly 4.184 joules, defined as the energy required to raise the temperature of one gram of water by one degree Celsius at 15 °C. This is the thermochemical calorie — distinct from the food calorie (written as Cal or kcal), which is 1,000 times larger. The calorie originated in 19th-century thermodynamics before the joule was established as the SI standard, and persists in chemistry, biology, and food science.
| Watt-hours (W·h) | Calories (cal) |
|---|---|
| 0.1 W·h | 86.0421 cal |
| 1 W·h | 860.4207 cal |
| 2 W·h | 1,720.8413 cal |
| 3 W·h | 2,581.262 cal |
| 5 W·h | 4,302.1033 cal |
| 10 W·h | 8,604.2065 cal |
| 20 W·h | 17,208.413 cal |
| 30 W·h | 25,812.6195 cal |
| 50 W·h | 43,021.0325 cal |
| 100 W·h | 86,042.065 cal |
| 1000 W·h | 860,420.6501 cal |
Frequently Asked Questions (FAQ)
How many calories are in 1 watt-hours?
1 watt-hours (W·h) is exactly 860.421 calories (cal).
How do I convert watt-hours to calories?
Multiply the value in watt-hours by 860.421 to get the result in calories. Or use the converter above — type any number and see the result instantly.