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 Kilowatt hours
Convert Watt-hour (Wh) to Kilowatt-hour (kWh) instantly with an exact formula, conversion table, and FAQ.
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Convert watt hours (Wh) 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 = Wh × 0.001
Results update instantly for Watt hours to Kilowatt hours conversions.
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Formula
kWh = Wh × 0.001
Wh = kWh × 1000
Conversion table
| 1 Wh | 0.001000 kWh |
| 5 Wh | 0.005000 kWh |
| 10 Wh | 0.010000 kWh |
| 20 Wh | 0.020000 kWh |
| 50 Wh | 0.050000 kWh |
| 100 Wh | 0.100000 kWh |
| 500 Wh | 0.500000 kWh |
| 1000 Wh | 1 kWh |
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How the formula works
Both watt-hour and kilowatt-hour measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in watt hours by 0.001 to get kilowatt hours. To reverse the conversion, multiply a kilowatt-hour value by 1000 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 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 watt hours to kilowatt hours?
Multiply the watt-hour value by 0.001 to get the equivalent in kilowatt hours. For example, 5 Wh × 0.001 = 0.005000 kWh.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 0.001 is an exact, non-rounded value.
Can I convert kilowatt hours back to watt hours?
Yes. Divide the kilowatt-hour value by 0.001, or multiply it by 1000, to get watt hours.
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About converting watt hours to kilowatt hours
A watt-hour (Wh) is the energy delivered by one watt of power sustained for one hour, equal to 3,600 joules. 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 watt hours 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.