Convert kWh to Wh
Convert kWh to Wh instantly. 1 kWh = 1,000 Wh. Formula, worked examples and a quick reference table.
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One kilowatt-hour equals 1,000 watt-hours. To convert any number of kilowatt-hours to watt-hours, multiply by 1,000.
The converter above works in both directions and updates as you type. Below you will find the formula, a worked example and a reference table of common values.
Energy conversions sit between physics and the kitchen. The joule is the SI unit and the one every equation uses; the calorie survives on food labels, where it is actually a kilocalorie a thousand times larger than the physicist’s calorie; and the kilowatt-hour is what an electricity meter counts. All three measure the same quantity, which is why an appliance’s consumption and a meal’s energy content can, in principle, be compared directly.
kWh to Wh formula
To go the other way, use kilowatt-hour = watt-hour ÷ 1,000.
About these units
The kilowatt-hour is the unit electricity is billed in worldwide: one kilowatt drawn for one hour, or 3.6 megajoules.
A watt-hour is one watt sustained for an hour, or 3,600 joules. It is the unit battery capacities are rated in, which makes it directly comparable across devices in a way that milliamp-hours are not.
Kilowatt-hour is also written kilowatt hours and units of electricity. Watt-hour is also written watt hours.
Sources
kWh to Wh conversion table
| Kilowatt-hour | Watt-hour |
|---|---|
| 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 |
| 250 kWh | 250,000 Wh |
| 500 kWh | 500,000 Wh |
| 1,000 kWh | 1,000,000 Wh |
Frequently asked questions
How many watt-hours are in a kilowatt-hour? +
There are 1,000 watt-hours in one kilowatt-hour.
What is 10 kWh in Wh? +
10 kWh equals 10,000 Wh. Multiply 10 by 1,000.
How do I convert watt-hour back to kilowatt-hour? +
Use kilowatt-hour = watt-hour ÷ 1,000. The converter above handles both directions, or see our dedicated Wh to kWh page.
How accurate is this kilowatt-hour to watt-hour conversion? +
The factor used is 1,000, carried at full double precision. Where a unit has an exact legal definition the factor is exact rather than approximate. Rounding is applied only to the displayed result, so the answer is never a calculation done on an already-rounded number.
Is there a quick way to estimate kWh to Wh in my head? +
Multiply by 1,000. That matches the true factor of 1,000 exactly, so no adjustment is needed for a mental estimate.