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 Kilowatt hours
Convert Calorie (cal) to Kilowatt-hour (kWh) instantly with an exact formula, conversion table, and FAQ.
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Convert calories (cal) to kilowatt hours (kWh) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A kilowatt-hour (kWh) is the standard billing unit for electricity, equal to 1,000 watts sustained for one hour.
kWh = cal × 0.000001162222222
Results update instantly for Calories to Kilowatt hours conversions.
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Formula
kWh = cal × 0.000001162222222
cal = kWh × 860420.6501
Conversion table
| 1 cal | 0.000001 kWh |
| 5 cal | 0.000006 kWh |
| 10 cal | 0.000012 kWh |
| 20 cal | 0.000023 kWh |
| 50 cal | 0.000058 kWh |
| 100 cal | 0.000116 kWh |
| 500 cal | 0.000581 kWh |
| 1000 cal | 0.001162 kWh |
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How the formula works
Both calorie and kilowatt-hour measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in calories by 0.000001162222222 to get kilowatt hours. To reverse the conversion, multiply a kilowatt-hour value by 860420.6501 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 Kilowatt-hour (kWh)?
A kilowatt-hour (kWh) is the standard billing unit for electricity, equal to 1,000 watts sustained for one hour.
How do I convert calories to kilowatt hours?
Multiply the calorie value by 0.000001162222222 to get the equivalent in kilowatt hours. For example, 5 cal × 0.000001162222222 = 0.000006 kWh.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 0.000001162222222 is an exact, non-rounded value.
Can I convert kilowatt hours back to calories?
Yes. Divide the kilowatt-hour value by 0.000001162222222, or multiply it by 860420.6501, to get calories.
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About converting calories to kilowatt 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 kilowatt-hour (kWh) is the standard billing unit for electricity, equal to 1,000 watts sustained for one hour.
Use this calculator to move between calories and kilowatt hours accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.