A watt-hour (Wh) is the energy delivered by one watt of power sustained for one hour, equal to 3,600 joules.
Watt hours to Calories
Convert Watt-hour (Wh) to Calorie (cal) instantly with an exact formula, conversion table, and FAQ.
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Convert watt hours (Wh) to calories (cal) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
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.
cal = Wh × 860.4206501
Results update instantly for Watt hours to Calories conversions.
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Formula
cal = Wh × 860.4206501
Wh = cal × 0.001162222222
Conversion table
| 1 Wh | 860.420650 cal |
| 5 Wh | 4302.103250 cal |
| 10 Wh | 8604.206501 cal |
| 20 Wh | 17208.413002 cal |
| 50 Wh | 43021.032505 cal |
| 100 Wh | 86042.065010 cal |
| 500 Wh | 430210.325048 cal |
| 1000 Wh | 860420.650096 cal |
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How the formula works
Both watt-hour and calorie measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in watt hours by 860.4206501 to get calories. To reverse the conversion, multiply a calorie value by 0.001162222222 to get back to watt hours.
Frequently asked questions
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.
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.
How do I convert watt hours to calories?
Multiply the watt-hour value by 860.4206501 to get the equivalent in calories. For example, 5 Wh × 860.4206501 = 4302.103250 cal.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 860.4206501 is an exact, non-rounded value.
Can I convert calories back to watt hours?
Yes. Divide the calorie value by 860.4206501, or multiply it by 0.001162222222, to get watt hours.
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About converting watt hours to calories
A watt-hour (Wh) is the energy delivered by one watt of power sustained for one hour, equal to 3,600 joules. 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.
Use this calculator to move between watt hours and calories accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.