Watts to Kilowatts Converter

1,500 W is 1.5 kW — and the reason you are here is probably the difference between kW and kWh.

Conversion table

Power	In kilowatts
0.5	0.0005 kW
1	0.001 kW
1.5	0.0015 kW
2	0.002 kW
2.5	0.0025 kW
3	0.003 kW
4	0.004 kW
5	0.005 kW
6	0.006 kW
7	0.007 kW
8	0.008 kW
9	0.009 kW
10	0.01 kW
12	0.012 kW
15	0.015 kW

🏠 Everyday power

1,000 W1 kW
LED bulb9 W = 0.009 kW
Electric kettle2,200 W = 2.2 kW
Home EV charger7,400 W = 7.4 kW

Getting kW and kWh straight

Kilowatts are a rate; kilowatt-hours are a quantity. Multiply kW by the hours it runs to get kWh, and only then do you have something the bill can charge for.
A "5 kW" solar array is its peak output in full sun, not its daily production. In most places it yields somewhere between 15 and 25 kWh on a good day.
Appliance labels give the maximum draw. A fridge rated 150 W does not use 150 W continuously — its compressor cycles, so its average is far lower.
The prefix is case-sensitive: kW is a kilowatt, kw is nothing, and mW is a milliwatt while MW is a megawatt, a billion times larger.

The conversion, and why it is the easy part

A kilowatt is a thousand watts, so the conversion is a decimal point moved three places: 1,500 W is 1.5 kW and 250 W is 0.25 kW. The watt itself is one joule per second, which makes it a rate — the speed at which energy is being used, right now. That is the whole reason the unit exists on an appliance label: it tells you how hard the device pulls while it is on, and nothing at all about how long you leave it on. The second half of the story, and the half that shows up on the bill, is time.

kW is not kWh, and the difference is the bill

Multiply a power by a time and you get an energy: 2 kW running for 3 hours is 6 kilowatt-hours. The kilowatt describes the tap; the kilowatt-hour is what came out of it. Your electricity meter counts only kWh, which is why a 2,000 W kettle used for two minutes a day costs almost nothing while a 150 W fridge running all year costs real money. The same confusion turns up in solar: a 5 kW array is rated at what it produces in full sun at that instant, and the useful figure — what it actually generates over a day or a year — is measured in kWh.

What household appliances draw

LED bulb 6–12 W; the incandescent it replaced was 60 W for the same light.
Laptop 30–70 W; a desktop with a graphics card, 200–600 W under load.
Fridge-freezer: rated around 100–200 W, but the compressor cycles, so the daily average is closer to 30–50 W.
Microwave 800–1,200 W of cooking power, drawing about 40% more from the socket.
Kettle, toaster, hair dryer and iron all sit at 1,500–2,500 W — anything that makes heat is expensive.
A home EV charger is 7.4 kW single-phase or 11 kW three-phase, which is more than the rest of the house combined.

Where kilowatts show up outside the house

A single solar panel is 350–450 W, so a 5 kW rooftop array is roughly twelve to fourteen panels.
Rapid EV chargers on motorways run at 50 to 350 kW, which is why they need their own grid connection.
A typical home's peak demand is 3–10 kW; a supply is usually fused for 60 to 100 amps.
A wind turbine is rated in megawatts: 3 MW is 3,000 kW, or roughly a thousand kettles.
A power station block is 300–1,600 MW. One gigawatt is a million kilowatts.
Standby draw matters at scale: twenty devices idling at 2 W each is 40 W, around 350 kWh a year.

Worked examples

From the label to the bill

A 1,500 W heater

1,500 W ÷ 1,000 = 1.5 kW
Running 4 hours: 1.5 × 4 = 6 kWh
At 0.20 per kWh, that is 1.20 a day

1,500 W = 1.5 kW, or 6 kWh in four hours

A 7.4 kW EV charger

7.4 kW = 7,400 W
A full 60 kWh battery: 60 ÷ 7.4 = 8.1 hours
Overnight charging fits comfortably; daytime top-ups do not

7.4 kW fills a 60 kWh battery in about 8 hours

Frequently Asked Questions

How many watts are in a kilowatt?

Exactly 1,000. The prefix kilo means a thousand in every SI unit, so converting is just moving the decimal point three places: 1,500 W is 1.5 kW, and 0.75 kW is 750 W.

What is the difference between kW and kWh?

A kilowatt is a rate of energy use and a kilowatt-hour is an amount of energy. Multiply the first by hours to get the second: a 2 kW heater running for three hours uses 6 kWh. Your meter and your bill count only kWh; the kW on the label tells you how fast the meter turns while the device is on.

How much does 1,500 W cost to run for an hour?

It uses 1.5 kWh, so multiply your tariff by 1.5. At 0.20 per kWh that is 0.30 an hour, or 1.20 for a four-hour evening. Heating appliances are expensive precisely because they sit in this 1.5–2.5 kW band.

Does a 5 kW solar system produce 5 kWh per day?

No — it produces 5 kW only in full midday sun. Daily output depends on latitude, season and weather, and in most temperate places a 5 kW array yields something like 15 to 25 kWh on a clear day and considerably less in winter. The kW figure is the ceiling, not the harvest.

Is mW the same as MW?

No, and the gap is enormous. A milliwatt (mW) is a thousandth of a watt; a megawatt (MW) is a million watts. They differ by a factor of a billion, which is why SI prefixes are case-sensitive and why writing kW as kw or Kw causes trouble in technical documents.

Why does my appliance label show a higher wattage than it seems to use?

Because the label states the maximum draw, not the average. A fridge rated 150 W runs its compressor only part of the time, so its real daily average may be 40 W. To know what an appliance actually costs, you need its running hours or a plug-in meter that counts kWh directly.