Watt to Kilowatt Formula
kW = W x 0.001
Conversion factors follow SI relationships published by BIPM and IEC, where those standards apply.
Watt to Kilowatt Converter
Quick Answer
1 W = 0.001 kW
Formula: Kilowatt = Watt x 0.001
Quick values
Worked examples
Convert 1 W to kW
kW = 1 x 0.001
Result: 1 W = 0.001 kW
Convert 10 W to kW
kW = 10 x 0.001
Result: 10 W = 0.01 kW
Convert 100 W to kW
kW = 100 x 0.001
Result: 100 W = 0.1 kW
About Watt and Kilowatt
The kilowatt is 1,000 watts by SI prefix. Divide watts by 1,000. Appliance labels, motor nameplates, and inverter ratings switch between W and kW depending on size.
Category hub: Power Conversion · Conversion charts · Conversion formulas
Watt to Kilowatt Conversion Table
| Watt (W) | Kilowatt (kW) |
|---|---|
| 1 W | 0.001 kW |
| 10 W | 0.01 kW |
| 100 W | 0.1 kW |
| 500 W | 0.5 kW |
| 750 W | 0.75 kW |
| 1000 W | 1 kW |
| 1500 W | 1.5 kW |
| 2000 W | 2 kW |
| 5000 W | 5 kW |
Browse all conversion charts → · Browse conversion formulas →
Practical use cases for Watt to Kilowatt
Motor and Drive Selection
Nameplates mix horsepower and kilowatts. Specifying a replacement motor requires converting so the electrical supply and mechanical load match.
Generator and Plant Sizing
Prime-mover ratings may be in horsepower while electrical output is in kW or kVA. Planners convert before comparing mechanical and electrical capacity.
HVAC Equipment
Fans, pumps, and chillers are cataloged in horsepower, kW, or tons of refrigeration. Designers convert to the unit used on the project schedule.
Automotive and Marine
Engine output is advertised in horsepower in some markets and kilowatts in others. Comparing vehicles requires a consistent power unit.
Renewable Energy
Inverter and turbine ratings are in kW or MW while some legacy documents still use horsepower. Conversion keeps interconnection studies consistent.
Workshop and Tooling
Machine-tool spindles and air compressors are often labeled in horsepower. Electrical planning converts that rating to kW for feeder and breaker sizing.
Watt to Kilowatt FAQs
Common questions about converting watt to kilowatt.
How do you convert watts to kilowatts?
Divide watts by 1,000. Example: 1,000 W = 1 kW, 750 W = 0.75 kW, 5,000 W = 5 kW. The factor is exact.
What is 1500 W in kW?
1,500 ÷ 1,000 = 1.5 kW. That is a typical space-heater or portable induction-cooktop draw.
Are watts and kilowatts energy or power?
They are power (rate). Energy is watt-hours or kilowatt-hours. A 1.5 kW heater running two hours uses 3 kWh — this page does not convert energy.
Where does the watt to kilowatt factor come from?
BIPM SI prefixes: kilo means 10³. NIST SP 811 uses the same prefix table. No efficiency or power-factor correction is applied.
Charts and printable PDF
Use the matching watt / kilowatt chart when you need a printable table or offline reference.
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