Watt-Hour to Kilowatt-Hour Converter
Convert Watt-Hour (Wh) to Kilowatt-Hour (kWh) instantly. 1 Wh = 0.001 kWh.
Energy Converter
27 units available
1 Wh = 0.001 kWh
Formula:
kWh = Wh × 0.001With your value: 1 Wh = 0.001 kWh
How big is that?
Everyday references on a logarithmic scale, all expressed in watt-hour so you can sanity-check the result.
Other Watt-Hour to Kilowatt-Hour conversions
Watt-Hour to Kilowatt-Hour Conversion Table
| Watt-Hour (Wh) | Kilowatt-Hour (kWh) |
|---|---|
| 0.5 | 0.0005 |
| 1 | 0.001 |
| 2 | 0.002 |
| 5 | 0.005 |
| 10 | 0.01 |
| 15 | 0.015 |
| 20 | 0.02 |
| 25 | 0.025 |
| 50 | 0.05 |
| 100 | 0.1 |
| 250 | 0.25 |
| 500 | 0.5 |
| 1000 | 1 |
Kilowatt-Hour to Watt-Hour Conversion Table
| Kilowatt-Hour (kWh) | Watt-Hour (Wh) |
|---|---|
| 0.5 | 500 |
| 1 | 1,000 |
| 2 | 2,000 |
| 5 | 5,000 |
| 10 | 10,000 |
| 15 | 15,000 |
| 20 | 20,000 |
| 25 | 25,000 |
| 50 | 50,000 |
| 100 | 100,000 |
| 250 | 250,000 |
| 500 | 500,000 |
| 1000 | 1,000,000 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
Watt-Hour (Wh)
Energy
Derived from the joule (1 J = 1 kg·m²/s²). Thermochemical and IT calories, BTU and kWh are exact defined multiples.
Source: NIST Special Publication 811, Guide for the Use of the International System of Units
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
Kilowatt-Hour (kWh)
Energy
Derived from the joule (1 J = 1 kg·m²/s²). Thermochemical and IT calories, BTU and kWh are exact defined multiples.
Source: NIST Special Publication 811, Guide for the Use of the International System of Units
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
How to Convert Watt-Hour to Kilowatt-Hour
To convert from Watt-Hour (Wh) to Kilowatt-Hour (kWh), multiply the value by 0.001.
Formula: kWh = Wh × 0.001
Reverse: Wh = kWh × 1,000
Step-by-Step Example
- Start with your value in Watt-Hour. For example: 5 Wh
- Multiply by the conversion factor: 5 x 0.001
- The result is: 0.005 kWh
About Watt-Hour
The watt-hour (Wh) is a unit of energy and work. One watt-hour equals 3600 joules. UnitConvertLab converts it against every other energy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
Common uses: energy calculations, engineering and science, education.
About Kilowatt-Hour
The kilowatt-hour is a unit of energy equal to 3.6 million joules, commonly used for electrical billing.
Common uses: electricity bills, energy consumption, appliances.
Frequently Asked Questions
How many Kilowatt-Hour are in 1 Watt-Hour?
There are exactly 0.001 Kilowatt-Hour in 1 Watt-Hour. This means the conversion factor from Watt-Hour to Kilowatt-Hour is 0.001.
What is the formula to convert Watt-Hour to Kilowatt-Hour?
The formula to convert Watt-Hour to Kilowatt-Hour is: kWh = Wh × 0.001. For example, to convert 10 Watt-Hour to Kilowatt-Hour, you would multiply 10 by 0.001.
What is a Watt-Hour?
The watt-hour (Wh) is a unit of energy and work. One watt-hour equals 3600 joules. UnitConvertLab converts it against every other energy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
What is a Kilowatt-Hour?
The kilowatt-hour is a unit of energy equal to 3.6 million joules, commonly used for electrical billing.
What are the common uses of Watt-Hour?
The Watt-Hour is commonly used in energy calculations, engineering and science, education.
Related Energy Conversions
Cite this page
UnitConvertLab. (2026). Watt-Hour to Kilowatt-Hour converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/watt_hour-to-kilowatt_hour