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 Kilocalories
Convert Watt-hour (Wh) to Kilocalorie (kcal) instantly with an exact formula, conversion table, and FAQ.
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Convert watt hours (Wh) to kilocalories (kcal) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A kilocalorie (kcal) equals 1,000 small calories and is the unit behind the food "Calorie" shown on nutrition labels.
kcal = Wh × 0.8604206501
Results update instantly for Watt hours to Kilocalories conversions.
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Formula
kcal = Wh × 0.8604206501
Wh = kcal × 1.162222222
Conversion table
| 1 Wh | 0.860421 kcal |
| 5 Wh | 4.302103 kcal |
| 10 Wh | 8.604207 kcal |
| 20 Wh | 17.208413 kcal |
| 50 Wh | 43.021033 kcal |
| 100 Wh | 86.042065 kcal |
| 500 Wh | 430.210325 kcal |
| 1000 Wh | 860.420650 kcal |
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How the formula works
Both watt-hour and kilocalorie measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in watt hours by 0.8604206501 to get kilocalories. To reverse the conversion, multiply a kilocalorie value by 1.162222222 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 Kilocalorie (kcal)?
A kilocalorie (kcal) equals 1,000 small calories and is the unit behind the food "Calorie" shown on nutrition labels.
How do I convert watt hours to kilocalories?
Multiply the watt-hour value by 0.8604206501 to get the equivalent in kilocalories. For example, 5 Wh × 0.8604206501 = 4.302103 kcal.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 0.8604206501 is an exact, non-rounded value.
Can I convert kilocalories back to watt hours?
Yes. Divide the kilocalorie value by 0.8604206501, or multiply it by 1.162222222, to get watt hours.
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About converting watt hours to kilocalories
A watt-hour (Wh) is the energy delivered by one watt of power sustained for one hour, equal to 3,600 joules. A kilocalorie (kcal) equals 1,000 small calories and is the unit behind the food "Calorie" shown on nutrition labels.
Use this calculator to move between watt hours and kilocalories accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.