A (small) calorie is a thermochemical unit of heat energy equal to 4.184 joules, historically the energy needed to raise 1 gram of water by 1°C.
Calories to Watt hours
Convert Calorie (cal) to Watt-hour (Wh) instantly with an exact formula, conversion table, and FAQ.
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Convert calories (cal) to watt hours (Wh) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A watt-hour (Wh) is the energy delivered by one watt of power sustained for one hour, equal to 3,600 joules.
Wh = cal × 0.001162222222
Results update instantly for Calories to Watt hours conversions.
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Formula
Wh = cal × 0.001162222222
cal = Wh × 860.4206501
Conversion table
| 1 cal | 0.001162 Wh |
| 5 cal | 0.005811 Wh |
| 10 cal | 0.011622 Wh |
| 20 cal | 0.023244 Wh |
| 50 cal | 0.058111 Wh |
| 100 cal | 0.116222 Wh |
| 500 cal | 0.581111 Wh |
| 1000 cal | 1.162222 Wh |
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How the formula works
Both calorie and watt-hour measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in calories by 0.001162222222 to get watt hours. To reverse the conversion, multiply a watt-hour value by 860.4206501 to get back to calories.
Frequently asked questions
What is Calorie (cal)?
A (small) calorie is a thermochemical unit of heat energy equal to 4.184 joules, historically the energy needed to raise 1 gram of water by 1°C.
What is Watt-hour (Wh)?
A watt-hour (Wh) is the energy delivered by one watt of power sustained for one hour, equal to 3,600 joules.
How do I convert calories to watt hours?
Multiply the calorie value by 0.001162222222 to get the equivalent in watt hours. For example, 5 cal × 0.001162222222 = 0.005811 Wh.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 0.001162222222 is an exact, non-rounded value.
Can I convert watt hours back to calories?
Yes. Divide the watt-hour value by 0.001162222222, or multiply it by 860.4206501, to get calories.
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About converting calories to watt hours
A (small) calorie is a thermochemical unit of heat energy equal to 4.184 joules, historically the energy needed to raise 1 gram of water by 1°C. A watt-hour (Wh) is the energy delivered by one watt of power sustained for one hour, equal to 3,600 joules.
Use this calculator to move between calories and watt hours accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.