Kilowatt-hours to Watt-hours Converter
One Kilowatt-hour equals 1000 Watt-hours (1 kWh = 1000 Wh). Multiply a Kilowatt-hour value by 1000 to get the equivalent in Watt-hours. Use the calculator above for your value, or check the examples and reference table below.
Formula
Wh = kWh × 1000
Multiply the Kilowatt-hour value by 1000 to get the equivalent value in Watt-hours.
Example Conversions
1 Kilowatt-hour (kWh)
1000 Watt-hour (Wh)
5 Kilowatt-hour (kWh)
5000 Watt-hour (Wh)
10 Kilowatt-hour (kWh)
10000 Watt-hour (Wh)
25 Kilowatt-hour (kWh)
25000 Watt-hour (Wh)
100 Kilowatt-hour (kWh)
100000 Watt-hour (Wh)
Conversion Table
| Kilowatt-hour (kWh) | Watt-hour (Wh) |
|---|---|
| 0.1 | 100 |
| 0.5 | 500 |
| 1 | 1000 |
| 2 | 2000 |
| 5 | 5000 |
| 10 | 10000 |
| 25 | 25000 |
| 50 | 50000 |
| 100 | 100000 |
| 250 | 250000 |
| 500 | 500000 |
| 1000 | 1000000 |
How to Convert Manually
Use these steps to convert Kilowatt-hour values to Watt-hour without the calculator.
- Write down the value in Kilowatt-hour (kWh) that you want to convert.
- Multiply that value by 1000.
- For example, 10 Kilowatt-hours × 1000 = 10000 Watt-hours.
- Label the result as Watt-hour (Wh).
Relative Size Comparison
This chart shows the visual difference in size between exactly one Kilowatt-hour and one Watt-hour.
About Kilowatt-hour and Watt-hour
The kilowatt-hour is exactly 3.6 megajoules. It is the unit on your electricity bill. Household consumption and electric vehicle battery sizes are stated in kilowatt-hours. The watt-hour is exactly 3,600 joules: one watt sustained for one hour. Battery capacities for phones, laptops, and e-bikes are rated in watt-hours. One Kilowatt-hour equals 1000 Watt-hours (1 kWh = 1000 Wh). Kilowatt-hour is used in electricity billing and in electric vehicle battery capacity. Watt-hour is used in battery capacity ratings.
Precision and Rounding:Energy factors mix exact definitions (1 kWh = 3,600,000 J; 1 cal = 4.184 J thermochemical) with measured conventions (1 BTU ≈ 1,055.056 J). Nutrition and utility bills round to whole units; engineering heat calculations should keep the full factor until the final step.
Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).
Worked Example
15Kilowatt-hours equals15000Watt-hours.
15 kWh × 1000 = 15000 Wh
FAQ
How do I convert Kilowatt-hour to Watt-hour?
Multiply the Kilowatt-hour value by 1000 to get the equivalent value in Watt-hours.
What is the formula for Kilowatt-hour to Watt-hour?
The formula is Wh = kWh × 1000.
How many Watt-hours are in 1 Kilowatt-hour?
1 Kilowatt-hour equals 1000 Watt-hours.
Can I convert Watt-hour back to Kilowatt-hour?
Yes. 1 Watt-hour equals 0.001 Kilowatt-hours, and the related converter can reverse the calculation.
What are common names for Kilowatt-hour and Watt-hour?
Kilowatt-hour is shown as kWh and may also be searched as kilowatt hour, kilowatt-hour, kwh. Watt-hour is shown as Wh and may also be searched as watt hour, watt-hour.
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