Calories to Watt-hours
Convert calories to watt-hours instantly. 1 cal = 0.0011622222 Wh. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert calories to watt-hours
To convert calories to watt-hours, divide by 860.4206500956 (multiply by 0.0011622222). The relationship is fixed, so the same factor works for any quantity — there is nothing to look up and nothing that changes with temperature, location or context.
Wh = cal × 0.0011622222
Calories to Watt-hours conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Calories | Watt-hours |
|---|---|
| 1 cal | 0.001162 Wh |
| 2 cal | 0.002324 Wh |
| 3 cal | 0.003487 Wh |
| 5 cal | 0.005811 Wh |
| 10 cal | 0.011622 Wh |
| 20 cal | 0.023244 Wh |
| 25 cal | 0.029056 Wh |
| 50 cal | 0.058111 Wh |
| 100 cal | 0.116222 Wh |
| 500 cal | 0.581111 Wh |
| 1,000 cal | 1.162222 Wh |
What is a calory?
The small calorie: energy to raise one gram of water by one degree.
What is a watt-hour?
One watt sustained for one hour. Battery capacity is quoted this way.
The formula
Wh = cal × 0.0011622222
Every result on this page comes from this formula. Nothing is rounded until the final display, so figures match a spreadsheet to the cent.
How to use the Calories to Watt-hours
- Type the number of calories you want to convert.
- Read the result in watt-hours straight away — there is no button to press.
- Check the table below for the values that come up most often, or reverse the conversion with the linked watt-hours to calories page.
Calories to Watt-hours — frequently asked questions
How many watt-hours are in a calory?
One calory equals 0.0011622222 Wh. Wh = cal × 0.0011622222
What is the formula to convert calories to watt-hours?
The formula is Wh = cal × 0.0011622222. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert watt-hours back to calories?
Divide instead of multiplying: one watt-hour is 860.4206500956 cal. The reverse converter is linked in the related tools list.
Is this conversion exact?
Yes. Both units are defined against the same base unit by international agreement, so the factor is exact — any rounding you see is only in the display, which you can widen by entering more decimal places.
Is this calories to watt-hours free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
What people search for
This page answers each of these searches. They are the exact phrases visitors use to find the calories to watt-hours.
- calories to watt-hours
- 1 calory to watt-hours
- how many watt-hours in a calory
- cal2wh
- calories in watt-hours
- calories to watt-hours converter
- convert calories to watt-hours
About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 19, 2026 · Calculation runs client-side · No data collected · Report an error