kWh to Wh Converter
Convert kilowatt-hours to watt-hours — multiply by a thousand. Results update as you type; exact factors shown.
One kilowatt-hour is 1,000 watt-hours — see the exact factor, not a rounded rule of thumb.
How the kwh to wh converter works
Energy converts through the joule. A thermochemical calorie is exactly 4.184 J, so a food Calorie (kcal) is 4.184 kJ. A kilowatt-hour is exactly 3.6 MJ. A BTU is 1,055.056 J and a US therm is 100,000 BTU.
Australia is fully metric under the National Measurement Act 1960; imperial units appear only in trade with the US and in older documents.
Common energy conversions
| From | To | Units |
|---|---|---|
| 0.001 kWh | 1 Wh | kilowatt-hours to watt-hours |
| 0.01 kWh | 10 Wh | kilowatt-hours to watt-hours |
| 0.1 kWh | 100 Wh | kilowatt-hours to watt-hours |
| 0.5 kWh | 500 Wh | kilowatt-hours to watt-hours |
| 1 kWh | 1,000 Wh | kilowatt-hour to watt-hours |
| 2 kWh | 2,000 Wh | kilowatt-hours to watt-hours |
| 5 kWh | 5,000 Wh | kilowatt-hours to watt-hours |
| 10 kWh | 10,000 Wh | kilowatt-hours to watt-hours |
| 20 kWh | 20,000 Wh | kilowatt-hours to watt-hours |
| 50 kWh | 50,000 Wh | kilowatt-hours to watt-hours |
| 100 kWh | 100,000 Wh | kilowatt-hours to watt-hours |
| 1,000 kWh | 1,000,000 Wh | kilowatt-hours to watt-hours |
Units in this converter and their exact factors
| Unit | Symbol | One unit in joules |
|---|---|---|
| joule | J | 1 joule |
| kilojoule | kJ | 1,000 joule |
| megajoule | MJ | 1,000,000 joule |
| calorie (thermochemical) | cal | 4.184 joule |
| kilocalorie (food Calorie) | kcal | 4,184 joule |
| watt-hour | Wh | 3,600 joule |
| kilowatt-hour | kWh | 3,600,000 joule |
| British thermal unit | BTU | 1,055.05585262 joule |
| therm (US) | thm | 105,505,585.262 joule |
| foot-pound | ft·lb | 1.3558179483 joule |
FAQFrequently asked questions about energy conversion
How many watt-hours in a kWh?
Exactly 1,000.
What is a phone battery in Wh?
About 15 to 20 Wh — a fraction of one kilowatt-hour.
What is an EV battery?
Typically 50 to 100 kWh, so 50,000 to 100,000 Wh.
Why do laptops quote Wh?
Because battery capacities are far below a kilowatt-hour, so the smaller unit reads better.
What is 0.1 kWh?
100 Wh.
Where these figures come from
- BIPM — The International System of Units (SI Brochure, 9th edition) — definitions of the base and derived units.
- NIST Special Publication 811 — Guide for the Use of the International System of Units — the exact conversion factors used here.
- National Measurement Institute (NMI) — Australia's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.