Watt-hours to Kilowatt-hours Converter
One Watt-hour equals 0.001 Kilowatt-hours (1 Wh = 0.001 kWh). Multiply a Watt-hour value by 0.001 to get the equivalent in Kilowatt-hours. Use the calculator above for your value, or check the examples and reference table below.
Formula
kWh = Wh × 0.001
Multiply the Watt-hour value by 0.001 to get the equivalent value in Kilowatt-hours.
Example Conversions
1 Watt-hour (Wh)
0.001 Kilowatt-hour (kWh)
5 Watt-hour (Wh)
0.005 Kilowatt-hour (kWh)
10 Watt-hour (Wh)
0.01 Kilowatt-hour (kWh)
25 Watt-hour (Wh)
0.025 Kilowatt-hour (kWh)
100 Watt-hour (Wh)
0.1 Kilowatt-hour (kWh)
Conversion Table
| Watt-hour (Wh) | Kilowatt-hour (kWh) |
|---|---|
| 0.1 | 0.0001 |
| 0.5 | 0.0005 |
| 1 | 0.001 |
| 2 | 0.002 |
| 5 | 0.005 |
| 10 | 0.01 |
| 25 | 0.025 |
| 50 | 0.05 |
| 100 | 0.1 |
| 250 | 0.25 |
| 500 | 0.5 |
| 1000 | 1 |
How to Convert Manually
Use these steps to convert Watt-hour values to Kilowatt-hour without the calculator.
- Write down the value in Watt-hour (Wh) that you want to convert.
- Multiply that value by 0.001.
- For example, 10 Watt-hours × 0.001 = 0.01 Kilowatt-hours.
- Label the result as Kilowatt-hour (kWh).
Relative Size Comparison
This chart shows the visual difference in size between exactly one Watt-hour and one Kilowatt-hour.
About Watt-hour and Kilowatt-hour
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. 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. One Watt-hour equals 0.001 Kilowatt-hours (1 Wh = 0.001 kWh). Watt-hour is used in battery capacity ratings and in small device power consumption. Kilowatt-hour is used in electricity billing.
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
15Watt-hours equals0.015Kilowatt-hours.
15 Wh × 0.001 = 0.015 kWh
FAQ
How do I convert Watt-hour to Kilowatt-hour?
Multiply the Watt-hour value by 0.001 to get the equivalent value in Kilowatt-hours.
What is the formula for Watt-hour to Kilowatt-hour?
The formula is kWh = Wh × 0.001.
How many Kilowatt-hours are in 1 Watt-hour?
1 Watt-hour equals 0.001 Kilowatt-hours.
Can I convert Kilowatt-hour back to Watt-hour?
Yes. 1 Kilowatt-hour equals 1000 Watt-hours, and the related converter can reverse the calculation.
What are common names for Watt-hour and Kilowatt-hour?
Watt-hour is shown as Wh and may also be searched as watt hour, watt-hour. Kilowatt-hour is shown as kWh and may also be searched as kilowatt hour, kilowatt-hour, kwh.
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