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Watts to kW Calculator
Most labels state watts. Continuous ratings, demand figures and many datasheets use kilowatts. Divide by 1,000 — and do not confuse volt-amps with watts along the way.
kW = watts ÷ 1,000
kW = watts ÷ 1,000. 1,000 W is 1 kW; 1,500 W is 1.5 kW; 2,400 W is 2.4 kW; 100 W is 0.1 kW.
From volt-amps, kW = VA × power factor ÷ 1,000. Current from the same wattage needs voltage — use the watts to amps calculator. Energy over a run needs time — use watts to kWh.
The watts
Real power from the rating label. Enter 1.5 kW as 1,500.
Result
Kilowatts
1.500 kW
1,500 W ÷ 1,000 = 1.500 kW
Nearest common reference: 1.5 kW — typical portable heater / hair-dryer class (about 1.5 kW).
Continuous circuit limits assume power factor 1 and the NEC 80 percent rule for continuous loads; real equipment may sit below those ceilings.
Informational use only, please verify before you rely on it
This reproduces the SI definition of the kilowatt (1 kW = 1,000 W) and the relationship real power = volt-amperes × power factor. It is a unit conversion, not a determination. It does not measure a load, size conductors or overcurrent protection, or select equipment. Confirm against the equipment nameplate.
This tool is provided for general informational and educational purposes only. Its output is an illustrative estimate generated from the values you enter and from general assumptions that will not match every deal, market, lender, or homeowner. It is not tax, legal, accounting, financial, or professional advice, and it is not a quote, an offer, a credit decision, or a guarantee of pricing, approval, timing, savings, or eligibility.
You are solely responsible for independently confirming all information presented here including any figures, rates, fees, margins, timelines, tax treatment, and federal, state, local, or utility incentives, with the applicable lender, authority having jurisdiction, and your own qualified tax, legal, and financial advisors before acting on it, relying on it, or presenting it to a homeowner or any third party. Incentive programs, lender terms, and permitting requirements change frequently and vary by jurisdiction.
Seamless Home is not a tax advisor, law firm, lender, or licensed installing contractor, and makes no representation or warranty as to the accuracy, completeness, or currency of the information produced by this tool. To the fullest extent permitted by law, Seamless Home accepts no liability for any decision made or action taken in reliance on it.
Why labels use watts and datasheets use kilowatts
A microwave, hair dryer or space heater states its draw in watts because the numbers stay readable — 1,500 W rather than 1.5 kW. Larger equipment flips the convention: a 7.5 kW heater is clearer than 7,500 W. The conversion never changes what was measured; it only changes the unit.
Two traps sit next to that arithmetic. First, a microwave's cooking watts are output, not input — converting the box number to kilowatts still understates the outlet draw. Second, volts × amps gives volt-amps, not watts, unless power factor is 1; see what power factor is.
To go the other direction from a datasheet kilowatt rating, use the kW to watts calculator. For how many kilowatt-hours that wattage uses over a day, the watts to kWh calculator applies runtime and duty cycle.
Frequently Asked Questions
How do you convert watts to kW?+
Divide by 1,000: kW = watts ÷ 1,000. 1,000 W is 1 kW; 1,500 W is 1.5 kW; 750 W is 0.75 kW. The relationship is exact.
How many kW is 1,500 watts?+
1.5 kW. That is a common continuous rating for portable heaters and many 120 V cooking appliances.
How many kW is 1,000 watts?+
Exactly 1 kW. One kilowatt is defined as 1,000 watts.
How do I convert VA to kW?+
Multiply by the power factor, then divide by 1,000 if you started in VA rather than kVA: kW = VA × PF ÷ 1,000. 1,800 VA at a power factor of 0.85 is 1.53 kW. Without the power factor, volt-amps are not kilowatts.
Is this the same as watts to kWh?+
No. Kilowatts are power — a rate. Kilowatt-hours are energy — an amount over time. Watts to kWh needs a runtime (and often a duty cycle). This page only changes the unit of power.
How is this different from kW to watts?+
It is the inverse. This page starts from watts on a label; kW to watts starts from kilowatts on a datasheet. Both use the same factor of 1,000.
Is this a determination?+
No. It reproduces the SI definition of the kilowatt and the relationship between volt-amperes and watts through power factor. It does not measure a load or size conductors or protection. Confirm against the nameplate.
Related resources
kW to Watts Calculator
The inverse — watts from a kilowatt rating.
Learn more →Watts to Amps Calculator
Current from the same wattage, with power factor.
Learn more →Watts to kWh Calculator
Energy from wattage × time, with duty cycle.
Learn more →What Is Power Factor?
Why VA and watts diverge on AC loads.
Learn more →Ratings read the way the nameplate wrote them
Seamless Home runs the design, permit and interconnection layer for the partners it works with — which is where a wattage gets read in the unit the next calculation actually needs. Coverage is confirmed per service area rather than promised as blanket availability.
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