A kilowatt-hour (kWh) is the standard billing unit for electricity, equal to 1,000 watts sustained for one hour.
Kilowatt hours to Watt hours
Convert Kilowatt-hour (kWh) to Watt-hour (Wh) instantly with an exact formula, conversion table, and FAQ.
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Convert kilowatt hours (kWh) 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 = kWh × 1000
Results update instantly for Kilowatt hours to Watt hours conversions.
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Formula
Wh = kWh × 1000
kWh = Wh × 0.001
Conversion table
| 1 kWh | 1000 Wh |
| 5 kWh | 5000 Wh |
| 10 kWh | 10000 Wh |
| 20 kWh | 20000 Wh |
| 50 kWh | 50000 Wh |
| 100 kWh | 100000 Wh |
| 500 kWh | 500000 Wh |
| 1000 kWh | 1.000000e+06 Wh |
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How the formula works
Both kilowatt-hour and watt-hour measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in kilowatt hours by 1000 to get watt hours. To reverse the conversion, multiply a watt-hour value by 0.001 to get back to kilowatt hours.
Frequently asked questions
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.
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 kilowatt hours to watt hours?
Multiply the kilowatt-hour value by 1000 to get the equivalent in watt hours. For example, 5 kWh × 1000 = 5000 Wh.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 1000 is an exact, non-rounded value.
Can I convert watt hours back to kilowatt hours?
Yes. Divide the watt-hour value by 1000, or multiply it by 0.001, to get kilowatt hours.
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About converting kilowatt hours to watt hours
A kilowatt-hour (kWh) is the standard billing unit for electricity, equal to 1,000 watts sustained for one hour. 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 kilowatt hours 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.