Convert Watts to Kilowatts

About converting Watts to Kilowatts

Watts (W) and Kilowatts (kW) are both units of power, so converting between them is a single multiplication: multiply your Watts figure by 0.001. Ten Watts comes to 0.01 Kilowatts, and a hundred works out at 0.1 Kilowatts.

Rule of thumb: going from Watts to Kilowatts divides, so the figure always shrinks — it takes about 1,000 Watts to make a single Kilowatt. If your answer came out bigger, you have the conversion the wrong way round.

What is a Watt?

The watt is the SI unit of power — one joule per second — named after James Watt, whose steam-engine improvements did as much as anything to make the idea of power commercially interesting. It measures a rate, not an amount: a watt tells you how fast energy is being moved or converted and says nothing on its own about how much has been used. That is the entire difference between the watts printed on a light bulb and the kilowatt-hours printed on the bill. It is also deliberately universal — the same unit rates a bulb, a loudspeaker, an engine, a laser and a cyclist on a hill.

What is a Kilowatt?

A kilowatt is a thousand watts, the size at which power stops being about gadgets and starts being about infrastructure. It rates the things in a house that actually move the meter — kettles, ovens, showers, heat pumps, immersion heaters — and it is the unit of EV charging, where the kilowatt figure sets how fast a car charges while the battery’s kilowatt-hours set how far it goes. It is also the legal unit of engine power in the European Union: manufacturers must state kW on a vehicle’s paperwork, even though the marketing beside it still leads with horsepower.

To put both in perspective: an LED bulb bright enough for a room draws about 10 watts, while an electric kettle draws a couple of kilowatts.

The converter above updates as you type, and the table lists common values for quick reference. Need the opposite direction? Use the Kilowatts to Watts converter, or browse all Power converters.