Calories (cal) to Watt-hours (W·h) Conversion
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
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 (cal) | Watt-hours (W·h) |
|---|---|
| 0.1 cal | 0.00011622222222222 W·h |
| 1 cal | 0.0011622222222222 W·h |
| 2 cal | 0.0023244444444444 W·h |
| 3 cal | 0.0034866666666667 W·h |
| 5 cal | 0.0058111111111111 W·h |
| 10 cal | 0.011622222222222 W·h |
| 20 cal | 0.023244444444444 W·h |
| 30 cal | 0.034866666666667 W·h |
| 50 cal | 0.058111111111111 W·h |
| 100 cal | 0.11622222222222 W·h |
| 1000 cal | 1.1622222222222 W·h |
Frequently Asked Questions (FAQ)
How many watt-hours are in 1 calories?
1 calories (cal) is exactly 0.001162 watt-hours (W·h).
How do I convert calories to watt-hours?
Multiply the value in calories by 0.001162 to get the result in watt-hours. Or use the converter above — type any number and see the result instantly.