kW to Watts Calculator
Convert kilowatts to watts. 1 kW = 1,000 W. Live calculator with simple formula and reference table.
Common conversions
| Input | Result |
|---|---|
| 0.1 kW | 100 W |
| 0.5 kW | 500 W |
| 1 kW | 1,000 W |
| 1.5 kW | 1,500 W |
| 2 kW | 2,000 W |
| 3 kW | 3,000 W |
| 5 kW | 5,000 W |
| 7.2 kW | 7,200 W |
| 10 kW | 10,000 W |
| 50 kW | 50,000 W |
The math behind it
- W = 7.2 × 1000
- W = 7200
Everything you need to know
The kilo prefix means 1,000, so converting kilowatts to watts is a single multiplication: multiply the kW figure by 1,000. This is the reverse of the watts-to-kW conversion, and it matters most when a device, spec sheet, or standard expects a rating in watts rather than kilowatts.
The metric power scale, from milli to mega
Power units step up and down in factors of 1,000. A milliwatt is 0.001 W, a watt is the base unit, a kilowatt is 1,000 W, and a megawatt is 1,000 kW (1,000,000 W). Kilowatts sit at the household and commercial scale; the moment a spec sheet, wiring diagram, or component rating drops down to an individual device level, watts become the more natural unit again, which is why the conversion runs in both directions constantly in electrical work.
Where kW loads get re-expressed in watts
Household and commercial equipment is often specified in kW at the system level but in watts at the component level. A window air conditioner draws roughly 1 to 1.5 kW (1,000-1,500 W), an electric oven 2 to 5 kW, and an electric water heater 4 to 5.5 kW. A Level 2 EV charger runs 7.2 to 11 kW (7,200-11,000 W), and a central air conditioning system draws 3 to 5 kW. Portable generators, by contrast, are almost always labeled in watts: a small camping generator might be rated 2,000 W (2 kW) continuous, while a whole-house standby unit runs 10,000 to 22,000 W (10-22 kW). Converting a kW system rating to watts is what lets you match it against a generator or inverter's watt rating on its nameplate.
Worked example: matching a load to a generator
A homeowner wants to run a 7.2 kW EV charger from a portable generator rated in watts. Multiply: 7.2 × 1,000 = 7,200 W. That number can now be compared directly against a generator's continuous watt rating; a 7,200 W generator would be running at its limit with no headroom for anything else, so a unit rated closer to 8,500-10,000 W continuous would be the safer match.
Common applications
Portable and standby generators are nameplated in watts. Converting a kW-rated load, such as a 7.2 kW EV charger, to 7,200 W is how you check it against a generator's continuous watt rating.
Heating elements and resistive loads are usually specified in watts. Converting a kW design target to watts picks the right element and matches it to a supply circuit's amperage.
Small motors and peak power ratings for drones or EVs are commonly stated in watts, sometimes in the tens of thousands. Multiplying an industrial kW drive rating by 1,000 puts it on the same scale for comparison.
Inverters and switch-mode power supplies list continuous and peak output in watts. Converting a kW load estimate to watts is the first step in picking a unit with enough headroom.
Common mistakes
Multiplying kVA by 1,000 gives apparent power in VA, not real power in watts. Apply the load's power factor first (VA × PF = W) if you need actual wattage.
Multiplying 2.5 kW by 100 instead of 1,000 gives a false 250 W, understating the load by a factor of 10 and risking an undersized generator or circuit.
kW is a rate of power; kWh is energy used over an hour. Converting kW to W with this formula does not touch the time dimension at all.
A converted kW-to-W running wattage figure doesn't account for motor startup surge, which can be 2 to 3 times higher for compressors and pumps. Check the surge rating separately when sizing a generator.
Frequently asked questions
Is 1,000 W equal to 1 kW?+
Yes, exactly. The kilo- prefix always represents a factor of 1,000, with no rounding or approximation involved.
How do I convert kW to watts by hand?+
Move the decimal point three places to the right. 2.5 kW becomes 2,500 W, and 0.75 kW becomes 750 W.
How many watts does a 7.2 kW EV charger use?+
7,200 watts. Multiply the kW rating by 1,000 to get the equivalent in watts, which is the unit most portable and standby generators are rated in.
Do I need to know the power factor to convert kW to watts?+
No, not for this conversion. A kilowatt figure is already real power, so multiplying by 1,000 gives real watts directly; power factor only matters when converting to or from kVA or amps.
Is kVA the same as kW once converted to watts?+
No. Multiplying kVA by 1,000 gives volt-amps (VA), not watts. Real watts equal VA multiplied by the power factor, so kVA and kW only match when the power factor is exactly 1.
How many watts is a 1.5 kW space heater?+
1,500 watts. That's close to the maximum continuous draw of a standard US 15 A, 120 V household circuit, which tops out around 1,800 W.
Why are generators labeled in watts instead of kW?+
Portable and standby generators are sized for individual appliances and tools, which are themselves rated in watts, so manufacturers keep the same unit for an easier direct comparison.
How many watts are in a 3 kW central air conditioner?+
3,000 watts. Central AC systems typically draw 3,000 to 5,000 W (3-5 kW) depending on the size of the home and the unit's efficiency rating.
Does a higher wattage number mean more energy used over time?+
Not by itself. Watts measure the instantaneous rate of power draw; the total energy used also depends on how many hours the device runs, which is measured in watt-hours or kilowatt-hours.