Convert Calories to Watt-hours
cal to Wh · energy conversion
What are calories and watt-hours?
A small calorie is the energy to heat one gram of water by 1 °C, about 4.184 J. A watt-hour is the energy of one watt sustained for one hour, equal to 3,600 J. For reference: a food Calorie is one kilocalorie (4,184 J), and home electricity is billed in kilowatt-hours.
How to convert calories to watt-hours
1 cal = 0.00116222 Wh. To convert, multiply the number of calories by 0.00116222. For example, 5 cal = 0.00581111 Wh, and 20 cal = 0.0232444 Wh. To go the other way, multiply watt-hours by 860.421 (since 1 Wh = 860.421 cal).
Calories to Watt-hours conversion table
| Calories (cal) | Watt-hours (Wh) |
|---|---|
| 1 | 0.00116222 |
| 10 | 0.0116222 |
| 100 | 0.116222 |
| 500 | 0.581111 |
| 1,000 | 1.16222 |
| 2,000 | 2.32444 |
| 5,000 | 5.81111 |
FAQ
What is 1 cal in Wh?
1 cal = 0.00116222 Wh. To convert any amount, multiply the number of calories by 0.00116222.
How do I convert watt-hours back to calories?
Go the other way: 1 Wh = 860.421 cal, so multiply watt-hours by 860.421 to get calories.
Is a calorie bigger than a watt-hour?
No — 1 cal is the smaller unit, equal to 0.00116222 Wh (it takes 860.421 cal to make one Wh).
Are these energy conversions exact?
They use the standard internationally-defined conversion factors. Results are rounded to six significant figures for readability, which is accurate enough for everyday and most technical use.