kWh to Wh Calculator
Kilowatt-hours and watt-hours are both units of energy. Enter any value in kWh to convert it directly to Wh; no time period is needed.
Quick answerMultiply kWh by 1,000 to get Wh. Exactly 1 kWh = 1,000 Wh, 0.1 kWh = 100 Wh, and 2.5 kWh = 2,500 Wh. This converts energy to energy; converting kWh to watts also requires a time period.
Do you need watt-hours or watts?
These similar-looking conversions answer different questions. Choose the result you actually need.
Change any number below — your result updates instantly, no button to click.
Your details
Results
Measure or improve the real-world result
These tools are relevant to the numbers above; you do not need them to use the calculator.
As an Amazon Associate we earn from qualifying purchases. We may earn a commission from links on this page, at no extra cost to you.
How it works
Watt-hours = kilowatt-hours × 1,000. The conversion is exact because the prefix kilo means 1,000: 1 kWh = 1,000 Wh, so 2.5 kWh = 2,500 Wh.
kWh to Wh conversion table
Multiply any kilowatt-hour value by 1,000 to get watt-hours. These common values are exact.
| Kilowatt-hours | Watt-hours |
|---|---|
| 0.001 kWh | 1 Wh |
| 0.01 kWh | 10 Wh |
| 0.1 kWh | 100 Wh |
| 0.5 kWh | 500 Wh |
| 1 kWh | 1,000 Wh |
| 2 kWh | 2,000 Wh |
| 2.5 kWh | 2,500 Wh |
| 5 kWh | 5,000 Wh |
| 10 kWh | 10,000 Wh |
| 50 kWh | 50,000 Wh |
| 100 kWh | 100,000 Wh |
To convert in the opposite direction, divide watt-hours by 1,000 or use the linked Wh to kWh calculator.
Worked example: convert 2.5 kWh to Wh
Multiply 2.5 by 1,000. The result is 2,500 Wh. Both numbers describe the same amount of energy; only the scale and unit label change.
When watt-hours are more useful than kilowatt-hours
Electricity bills and large home batteries usually use kWh because the numbers stay compact. Portable power stations, small batteries and device energy use are often shown in Wh. Converting to the same unit makes capacities easier to compare.
This conversion does not produce watts. Watts measure power, while Wh and kWh measure energy. To find average watts from kWh, you also need the number of hours over which the energy was used.
Why the 1,000-to-1 conversion is exact
The hour part does not change when converting kWh to Wh; only the metric prefix changes. The International Bureau of Weights and Measures (BIPM) defines kilo as 10³, or 1,000. NIST lists 1 Wh as 3.6 × 10³ joules and 1 kWh as 3.6 × 10⁶ joules—the same exact 1,000-to-1 ratio. No estimated efficiency or rounding factor is involved.
Sources used for assumptions: BIPM — SI Brochure, 9th edition: kilo is 10³; NIST — Guide to the SI, Appendix B.9: Wh and kWh energy factors.
Frequently asked questions
How many watt-hours are in 1 kWh?
Exactly 1,000 Wh. Multiply any kWh value by 1,000 to convert it to watt-hours.
How many watt-hours are in 5 kWh?
5 kWh equals 5,000 Wh because 5 × 1,000 = 5,000.
Is kWh to Wh the same as kWh to watts?
No. kWh and Wh are both energy units, so the conversion is a fixed factor of 1,000. Converting kWh to average watts also requires a time period.
How do I convert Wh back to kWh?
Divide the watt-hours by 1,000. For example, 2,500 Wh ÷ 1,000 = 2.5 kWh.
Related calculators
Wh to kWh Calculator
Watt-hours and kilowatt-hours are both units of energy. Enter any Wh value to convert it d…
ConversionskWh to Watts Calculator
Enter energy used in kilowatt-hours and the time period to calculate the average power in …
ConversionskWh to Amp-Hours Calculator
Convert energy in kilowatt-hours to battery capacity in amp-hours. Enter the kWh and nomin…
ConversionsmAh to Wh Calculator & Flight Check
Convert a battery or power bank from mAh to Wh, then compare the result with the FAA passe…