A kilowatt-hour (kWh) is the standard electricity-billing unit, 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 electrical energy delivered by one watt sustained for one hour.
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 electricity-billing unit, equal to 1,000 watts sustained for one hour.
What is Watt-hour (Wh)?
A watt-hour (Wh) is the electrical energy delivered by one watt sustained for one hour.
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 electricity-billing unit, equal to 1,000 watts sustained for one hour. A watt-hour (Wh) is the electrical energy delivered by one watt sustained for one hour.
Use this calculator to move between kilowatt-hours and watt-hours accurately for homework, engineering, billing, or everyday electricity calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.