Convert Kilowatt-hours to Watt-hours
1 kilowatt-hour (kWh) equals 1000 watt-hours (Wh).
1 kWh = 1000 Wh
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk kilowatt-hour to watt-hour converter to paste a column from Excel.
How to Convert Kilowatt-hour to Watt-hour
- 1 kWh = 1000 Wh
- 1 Wh = 0.001 kWh
- Example: convert 15 kWh to Wh: 15 kWh = 15 × 1000 Wh = 15000 Wh
Formula
Wh = kWh × 1000
Derivation from SI units:
- 1 kWh = 1000 W × 3600 s = 3.6 × 10⁶ J
- 1 Wh = 1 W × 3600 s = 3600 J
- 1 kWh = 3600000 J ÷ 3600 J per Wh = 1000 Wh
Both units are defined exactly, so the factor is exact. Kilowatt-hour definition: kilowatt-hour; Watt-hour definition: watt-hour.
Worked examples
- A reading of 10 kWh converts to 10000 Wh.
10 kWh × 1000 = 10000 Wh - A value of 75 kWh is 75000 Wh.
75 kWh × 1000 = 75000 Wh
Kilowatt-hour to Watt-hour conversion table
| Kilowatt-hours (kWh) | Watt-hours (Wh) |
|---|---|
| 0.1 kWh | 100 Wh |
| 0.5 kWh | 500 Wh |
| 1 kWh | 1000 Wh |
| 2 kWh | 2000 Wh |
| 5 kWh | 5000 Wh |
| 10 kWh | 10000 Wh |
| 13.5 kWh | 13500 Wh |
| 20 kWh | 20000 Wh |
| 30 kWh | 30000 Wh |
| 50 kWh | 50000 Wh |
| 75 kWh | 75000 Wh |
| 100 kWh | 100000 Wh |
| 300 kWh | 300000 Wh |
| 900 kWh | 900000 Wh |
| 1000 kWh | 1000000 Wh |
| 10000 kWh | 10000000 Wh |
Where it's used
Kilowatt-hours are used for electricity bills and meters, while watt-hours appear in battery capacity (phone ≈ 15 Wh; airline limit 100 Wh per power bank). Both measure energy, work and heat, so the conversion is a fixed factor.
Kilowatt-hour to other energy units
| Conversion | 1 kWh equals |
|---|---|
| kilowatt-hour to joule | 3600000 J |
| kilowatt-hour to kilojoule | 3600 kJ |
| kilowatt-hour to megajoule | 3.6 MJ |
| kilowatt-hour to calorie | 860420.6501 cal |
| kilowatt-hour to kilocalorie | 860.4206501 kcal |
| kilowatt-hour to watt-hour | 1000 Wh |
| kilowatt-hour to BTU | 3412.141633 BTU |
| kilowatt-hour to therm | 0.03412956341 thm |
| kilowatt-hour to electronvolt | 2.246943267 × 10²⁵ eV |
| kilowatt-hour to foot-pound | 2655223.737 ft·lbf |
| kilowatt-hour to erg | 36000000000000 erg |
Frequently asked questions
How many watt-hours are in 1 kilowatt-hour?
1 kWh = 1000 Wh.
How do I convert kilowatt-hours to watt-hours?
Multiply the value in kWh by 1000. For example, 15 kWh × 1000 = 15000 Wh.
Is the kWh to Wh conversion exact?
Yes. Both units are defined exactly, and 1 kWh is exactly 1000 Wh.
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "kilowatt hour (kW·h)".
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "watt hour (W·h)".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Kilowatt-hours to Watt-hours. Retrieved October 17, 2026, from https://scientificconverters.com/energy/kilowatt-hours-to-watt-hours/
IEEE
Scientific Converters, "Convert Kilowatt-hours to Watt-hours," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/energy/kilowatt-hours-to-watt-hours/