Convert Watt-hours to Calories
Wh to cal · energy conversion
What are watt-hours and calories?
A watt-hour is the energy of one watt sustained for one hour, equal to 3,600 J. A small calorie is the energy to heat one gram of water by 1 °C, about 4.184 J. For reference: a food Calorie is one kilocalorie (4,184 J), and home electricity is billed in kilowatt-hours.
How to convert watt-hours to calories
1 Wh = 860.421 cal. To convert, multiply the number of watt-hours by 860.421. For example, 5 Wh = 4,302.1 cal, and 20 Wh = 17,208.4 cal. To go the other way, multiply calories by 0.00116222 (since 1 cal = 0.00116222 Wh).
Watt-hours to Calories conversion table
| Watt-hours (Wh) | Calories (cal) |
|---|---|
| 1 | 860.421 |
| 10 | 8,604.21 |
| 100 | 86,042.1 |
| 500 | 430,210 |
| 1,000 | 860,421 |
| 2,000 | 1,720,840 |
| 5,000 | 4,302,100 |
FAQ
What is 1 Wh in cal?
1 Wh = 860.421 cal. To convert any amount, multiply the number of watt-hours by 860.421.
How do I convert calories back to watt-hours?
Go the other way: 1 cal = 0.00116222 Wh, so multiply calories by 0.00116222 to get watt-hours.
Is a watt-hour bigger than a calorie?
Yes — 1 Wh is the larger unit, equal to 860.421 cal.
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.