Calories to Watt-hours Converter
How to convert calories to watt-hours
watt-hours = calories ÷ 860.42065
To convert calories to watt-hours, divide the number of calories by 860.42065.
1 cal = 0.00116222222 Wh
Examples
- One kilocalorie, or one food Calorie: 1,000 cal ÷ 860.42065 = 1.16222222 Wh
- 500 cal ÷ 860.42065 = 0.581111111 Wh
Good to know
This is the thermochemical calorie, exactly 4.184 J. It is the small calorie: the "Calories" on food labels are kilocalories, 1000 times larger. The International Table calorie (4.1868 J) is slightly different.
Calories to watt-hours conversion table
| Calories (cal) | Watt-hours (Wh) |
|---|---|
| 1 cal | 0.00116222222 Wh |
| 2 cal | 0.00232444444 Wh |
| 5 cal | 0.00581111111 Wh |
| 10 cal | 0.0116222222 Wh |
| 20 cal | 0.0232444444 Wh |
| 50 cal | 0.0581111111 Wh |
| 100 cal | 0.116222222 Wh |
| 200 cal | 0.232444444 Wh |
| 250 cal | 0.290555556 Wh |
| 500 cal | 0.581111111 Wh |
| 1,000 cal | 1.16222222 Wh |
| 2,000 cal | 2.32444444 Wh |
| 2,500 cal | 2.90555556 Wh |
| 5,000 cal | 5.81111111 Wh |
| 10,000 cal | 11.6222222 Wh |
Unit definitions
- Calorie (cal)
- The thermochemical calorie is defined as exactly 4.184 joules, roughly the energy needed to heat one gram of water by one degree Celsius.
- Watt-hour (Wh)
- A watt-hour is the energy used by a 1 watt load running for one hour, exactly 3600 joules. It is used for battery capacities.