Watt-hours to kilowatt-hours
Multiply watt-hours by 0.001 to get kilowatt-hours.
5,000 Wh = 5 kWh
How to convert watt-hours to kilowatt-hours
The kilowatt-hour is one kilowatt for one hour, exactly 3.6 megajoules — the electricity billing unit. The watt-hour is one watt sustained for one hour, exactly 3600 joules — one thousandth of a kilowatt-hour.
Worked example — 5,000 Wh: 5,000 × 0.001 = 5 kWh.
Watt-hours to kilowatt-hours table
| Watt-hours | Kilowatt-hours |
|---|---|
| 100 Wh | 0.1 kWh |
| 500 Wh | 0.5 kWh |
| 1,000 Wh | 1 kWh |
| 2,000 Wh | 2 kWh |
| 5,000 Wh | 5 kWh |
| 10,000 Wh | 10 kWh |
| 20,000 Wh | 20 kWh |
| 50,000 Wh | 50 kWh |
| 100,000 Wh | 100 kWh |
Reverse and related
About watt-hours and kilowatt-hours
Watt-hour (Wh)
1 Wh = 0.001 kWhDefinition. One watt sustained for one hour, exactly 3600 joules — one thousandth of a kilowatt-hour
History and origin
The watt-hour is the energy of one watt delivered for one hour, exactly 3600 joules. It is one thousandth of the kilowatt-hour used on electricity bills.
Current use
Watt-hours rate battery capacity — phone, laptop and power-bank batteries are labelled in Wh or mWh.
Source: NIST SP 811, Appendix B; ISO 80000-5 (energy)
Kilowatt-hour (kWh)
1 kWh = 1,000 WhDefinition. One kilowatt for one hour, exactly 3.6 megajoules — the electricity billing unit
History and origin
The kilowatt-hour is the energy of one kilowatt sustained for one hour, exactly 3.6 megajoules. It became the standard way to bill electricity as power grids spread.
Current use
Kilowatt-hours are the unit on electricity bills and describe the capacity of batteries, including electric-vehicle packs.
Source: NIST SP 811, Appendix B; ISO 80000-5 (energy)
Where people use this
Watt-hours: battery capacity, small appliances. Kilowatt-hours: electricity bills, EV batteries. A 5000 Wh battery is 5 kWh.
Every value is carried to full double precision; the display is rounded.
Both units are defined in NIST SP 811, Appendix B; ISO 80000-5 (energy).
Questions people ask
How many kWh is 1000 Wh?
1000 Wh is exactly 1 kWh.
How many Wh in a kWh?
One kilowatt-hour is 1000 watt-hours.
How big is a phone battery in kWh?
A phone battery is about 10 to 20 Wh, roughly 0.01 to 0.02 kWh.