Calorie to Watt-hour Converter (cal to Wh)
1 calorie equals 0.00116222 watt-hours (Wh) — multiply the number of calories by 0.00116222 to convert. This comes from 4.184 joules per calorie divided by 3,600 joules per watt-hour.
The formula
Multiply calories by the exact factor 0.00116222:
Wh = cal × 0.00116222For example, 1000 cal × 0.00116222 = 1.16222 Wh. To reverse it, divide by 0.00116222 (or multiply by 860.42065).
Conversion table
| Calories (cal) | Watt-hours (Wh) |
|---|---|
| 1 | 0.00116222 |
| 2 | 0.00232444 |
| 5 | 0.0058111 |
| 10 | 0.0116222 |
| 25 | 0.0290555 |
| 50 | 0.058111 |
| 100 | 0.116222 |
| 500 | 0.58111 |
| 1000 | 1.16222 |
How to convert online
- Type the number of calories into the first box.
- Read the watt-hour result instantly in the second box.
- Enter a Wh value instead to convert back to calories — it works both ways.
Use the Calorie to Watt-hour Converter — free and instant in your browser.
Where this conversion is used
Watt-hours describe small energy stores like batteries and device consumption, while calories measure heat and food energy. Converting cal to Wh is useful for relating a heat or dietary energy value to the electrical scale of a battery or gadget, and for cross-checking energy figures between physics and everyday power specs.
Scaling and accuracy
The conversion is linear, so scaling is straightforward: since 1,000 cal = 1.16222 Wh, then 5,000 cal = 5.8111 Wh and about 860 cal makes 1 Wh. For a tangible comparison, a small AA battery holds roughly 3 Wh, equal to about 2,581 small calories of energy. The factor comes from the exact definitions of the calorie (4.184 J) and the watt-hour (3,600 J), so the tool's results stay consistent to the displayed precision — handy when relating dietary or heat energy to the electrical scale of batteries and devices.
FAQ
How many watt-hours are in a calorie?
One calorie equals 0.00116222 Wh. Multiply calories by 0.00116222 — for example, 10 cal = 0.0116222 Wh.
How many calories are in a watt-hour?
One Wh equals about 860.42 small calories, since 1 Wh = 3,600 J and each calorie is 4.184 J.
How do I convert watt-hours back to calories?
Divide by 0.00116222, or multiply by 860.42065. For instance, 1 Wh ≈ 860.42 cal.
Is the conversion exact?
The factor derives from exact definitions (4.184 J/cal and 3,600 J/Wh); 0.00116222 is the rounded decimal the tool applies consistently.
Related converters
- Watt-hour to Calorie Converter
- Calorie to Joule Converter
- Calorie to Kilojoule Converter
- Calorie to Kilowatt-hour Converter
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