Kilowatt-hours to Watt-hours
Convert kilowatt-hours to watt-hours instantly. 1 kWh = 1,000 Wh. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert kilowatt-hours to watt-hours
To convert kilowatt-hours to watt-hours, multiply by 1,000. The relationship is fixed, so the same factor works for any quantity — there is nothing to look up and nothing that changes with temperature, location or context.
Wh = kWh × 1,000
Kilowatt-hours to Watt-hours conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Kilowatt-hours | Watt-hours |
|---|---|
| 1 kWh | 1,000 Wh |
| 2 kWh | 2,000 Wh |
| 3 kWh | 3,000 Wh |
| 5 kWh | 5,000 Wh |
| 10 kWh | 10,000 Wh |
| 20 kWh | 20,000 Wh |
| 25 kWh | 25,000 Wh |
| 50 kWh | 50,000 Wh |
| 100 kWh | 100,000 Wh |
| 500 kWh | 500,000 Wh |
| 1,000 kWh | 1,000,000 Wh |
What is a kilowatt-hour?
The unit on every electricity bill: a thousand watts for one hour.
What is a watt-hour?
One watt sustained for one hour. Battery capacity is quoted this way.
The formula
Wh = kWh × 1,000
Every result on this page comes from this formula. Nothing is rounded until the final display, so figures match a spreadsheet to the cent.
How to use the Kilowatt-hours to Watt-hours
- Type the number of kilowatt-hours you want to convert.
- Read the result in watt-hours straight away — there is no button to press.
- Check the table below for the values that come up most often, or reverse the conversion with the linked watt-hours to kilowatt-hours page.
Kilowatt-hours to Watt-hours — frequently asked questions
How many watt-hours are in a kilowatt-hour?
One kilowatt-hour equals 1,000 Wh. Wh = kWh × 1,000
What is the formula to convert kilowatt-hours to watt-hours?
The formula is Wh = kWh × 1,000. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert watt-hours back to kilowatt-hours?
Divide instead of multiplying: one watt-hour is 0.001 kWh. The reverse converter is linked in the related tools list.
Is this conversion exact?
Yes. Both units are defined against the same base unit by international agreement, so the factor is exact — any rounding you see is only in the display, which you can widen by entering more decimal places.
Is this kilowatt-hours to watt-hours free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
What people search for
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About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 19, 2026 · Calculation runs client-side · No data collected · Report an error