Convert Watt-hours to Kilowatt-hours
Convert Watt-hours to Kilowatt-hours instantly. 1 Watt-hour (Wh) equals 0.001 Kilowatt-hours (kWh).
Watt-hours to Kilowatt-hours conversion table
| Watt-hours (Wh) | Kilowatt-hours (kWh) |
|---|---|
| 1 Wh | 0.001 kWh |
| 2 Wh | 0.002 kWh |
| 3 Wh | 0.003 kWh |
| 5 Wh | 0.005 kWh |
| 10 Wh | 0.01 kWh |
| 20 Wh | 0.02 kWh |
| 50 Wh | 0.05 kWh |
| 100 Wh | 0.1 kWh |
| 500 Wh | 0.5 kWh |
| 1,000 Wh | 1 kWh |
1 Watt-hour = 0.001 Kilowatt-hours · multiply Watt-hours by 0.001
About converting Watt-hours to Kilowatt-hours
Watt-hours (Wh) and Kilowatt-hours (kWh) are both units of energy, so converting between them is a single multiplication: multiply your Watt-hours figure by 0.001. Ten Watt-hours comes to 0.01 Kilowatt-hours, and a hundred works out at 0.1 Kilowatt-hours.
Rule of thumb: going from Watt-hours to Kilowatt-hours divides, so the figure always shrinks — it takes about 1,000 Watt-hours to make a single Kilowatt-hour. If your answer came out bigger, you have the conversion the wrong way round.
What is a Watt-hour?
A watt-hour is energy, not power, and that distinction trips people up constantly. A watt is a rate — energy per second — so a watt-hour is what you get by sustaining that rate for an hour: a quantity of energy expressed as "this much power for this long". It is the natural unit for anything that stores energy and releases it gradually, which is why phone and laptop batteries are rated in watt-hours rather than the milliamp-hours stamped on the cell, and why airlines police lithium batteries by their watt-hour rating. Capacity in watt-hours tells you how long a load can run; watts alone never can.
What is a Kilowatt-hour?
The kilowatt-hour is the unit your electricity bill is charged in, and almost the only energy unit most people meet by name. It is energy, not power: a kilowatt is a rate of use, a kilowatt-hour is the amount consumed by running at that rate for an hour. Utilities bill in kWh because that is what they actually deliver — a meter counts accumulated energy, not instantaneous demand. It is also the unit that sizes batteries. An EV pack and a home storage unit are both quoted in kilowatt-hours, so the figure tells you how much range or backup you have bought, while the kilowatt rating only says how fast it can be delivered.
To put both in perspective: a phone battery holds somewhere around 15 watt-hours, while an electric car covers roughly five kilometres on a kilowatt-hour.
The converter above updates as you type, and the table lists common values for quick reference. Need the opposite direction? Use the Kilowatt-hours to Watt-hours converter, or browse all Energy converters.
Frequently asked questions
How many Kilowatt-hours are in one Watt-hour?
There are 0.001 Kilowatt-hours in one Watt-hour.
How do I convert Watt-hours to Kilowatt-hours?
Multiply the number of Watt-hours by 0.001. For example, 10 Watt-hours = 0.01 Kilowatt-hours.
What is 100 Watt-hours in Kilowatt-hours?
100 Watt-hours is equal to 0.1 Kilowatt-hours.
How do I convert Kilowatt-hours to Watt-hours?
Multiply the Kilowatt-hours value by 1,000 (or divide by 0.001).
Is this Watt-hours to Kilowatt-hours conversion exact?
Yes, exactly. Both units are fixed against the same base by definition, and 1 Watt-hour = 0.001 Kilowatt-hours is the complete value — nothing is rounded away.
What is a Watt-hour?
A watt-hour is energy, not power, and that distinction trips people up constantly. A watt is a rate — energy per second — so a watt-hour is what you get by sustaining that rate for an hour: a quantity of energy expressed as "this much power for this long". It is the natural unit for anything that stores energy and releases it gradually, which is why phone and laptop batteries are rated in watt-hours rather than the milliamp-hours stamped on the cell, and why airlines police lithium batteries by their watt-hour rating. Capacity in watt-hours tells you how long a load can run; watts alone never can.
What is a Kilowatt-hour?
The kilowatt-hour is the unit your electricity bill is charged in, and almost the only energy unit most people meet by name. It is energy, not power: a kilowatt is a rate of use, a kilowatt-hour is the amount consumed by running at that rate for an hour. Utilities bill in kWh because that is what they actually deliver — a meter counts accumulated energy, not instantaneous demand. It is also the unit that sizes batteries. An EV pack and a home storage unit are both quoted in kilowatt-hours, so the figure tells you how much range or backup you have bought, while the kilowatt rating only says how fast it can be delivered.