Kilowatt-hours to watt-hours
Multiply kilowatt-hours by 1,000 to get watt-hours.
5 kWh = 5,000 Wh
How to convert kilowatt-hours to watt-hours
The watt-hour is one watt sustained for one hour, exactly 3600 joules — one thousandth of a kilowatt-hour. The kilowatt-hour is one kilowatt for one hour, exactly 3.6 megajoules — the electricity billing unit.
Worked example — 5 kWh: 5 × 1,000 = 5,000 Wh.
Kilowatt-hours to watt-hours table
| Kilowatt-hours | Watt-hours |
|---|---|
| 0.1 kWh | 100 Wh |
| 0.5 kWh | 500 Wh |
| 1 kWh | 1,000 Wh |
| 2 kWh | 2,000 Wh |
| 5 kWh | 5,000 Wh |
| 10 kWh | 10,000 Wh |
| 13.5 kWh | 13,500 Wh |
| 50 kWh | 50,000 Wh |
| 75 kWh | 75,000 Wh |
Reverse and related
About kilowatt-hours and watt-hours
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)
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)
Where people use this
Kilowatt-hours: electricity bills, EV batteries. Watt-hours: battery capacity, small appliances. A 13.5 kWh home battery is 13,500 Wh.
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 Wh is 1 kWh?
One kilowatt-hour is 1000 watt-hours.
How many Wh is 13.5 kWh?
A 13.5 kWh home battery is 13,500 Wh.
How many Wh is 0.5 kWh?
Half a kWh is 500 Wh.