Watts (W)
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Equivalent power
Accurate conversion between kilowatts (kW) and watts (W)
Convert kilowatts to watts instantly with precise calculations for 2026. Includes reverse watts to kilowatts conversion, megawatts, gigawatts, horsepower, BTU/hr, full formula reference, and power reference tables.
Professional power conversion for electrical engineering, solar energy, appliances, and industrial applications
Convert kilowatts to watts using the exact SI prefix definition: 1 kW = 1,000 W (exactly, by definition). The kilo- prefix always means 1,000 in the SI system. Our tool outputs watts, megawatts, gigawatts, milliwatts, horsepower (mechanical and metric), BTU/hr, and calories/second simultaneously — giving you a complete multi-unit power breakdown in one step.
Switch seamlessly between kW → W and W → kW conversion modes. Whether you are reading a solar panel output in kilowatts and need it in watts for circuit design, converting appliance power ratings, sizing a generator, checking motor nameplate data, or calculating electricity costs, both directions are handled instantly from a single input.
Essential for electrical engineering, solar PV system design, home appliance energy use, generator sizing, electric vehicle charging, industrial motor specification, HVAC system design, data centre power planning, and any context in 2026 where power values in kilowatts need to be expressed in watts or other power units for calculations or comparisons.
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The watt (W) is the SI unit of power, defined as one joule of energy transferred per second (1 W = 1 J/s). It is named after Scottish engineer James Watt (1736–1819). The watt is the fundamental SI unit for all power measurements — from tiny electronic circuits drawing milliwatts to massive power stations generating gigawatts. In electrical terms, 1 watt equals 1 volt multiplied by 1 ampere (1 W = 1 V × 1 A), making it directly applicable to all electrical power calculations.
The kilowatt (kW) is simply 1,000 watts, using the standard SI kilo- prefix (k = 10³). The conversion is therefore exact and trivial: 1 kW = 1,000 W, and 1 W = 0.001 kW. Kilowatts are used in everyday contexts because watt values for common equipment are often in the thousands — a household electric kettle uses about 2,000–3,000 W, which is more conveniently expressed as 2–3 kW. Electricity bills are measured in kilowatt-hours (kWh), solar panel outputs are rated in kW, and electric vehicle chargers are specified in kW. For related energy conversion from thermal units, see our BTU to Joules converter.
1 kW = 1,000 W exactly (SI definition) | 1 W = 0.001 kW
| Kilowatts (kW) | Watts (W) | Megawatts (MW) | Horsepower (hp) | BTU/hr | Context |
|---|---|---|---|---|---|
| 0.001 kW | 1 W | 0.000001 MW | 0.001341 hp | 3.412 BTU/hr | LED lamp |
| 0.01 kW | 10 W | 0.00001 MW | 0.01341 hp | 34.12 BTU/hr | Phone charger |
| 0.1 kW | 100 W | 0.0001 MW | 0.13410 hp | 341.2 BTU/hr | Incandescent bulb |
| 0.5 kW | 500 W | 0.0005 MW | 0.67051 hp | 1,706 BTU/hr | Blender |
| 1 kW | 1,000 W | 0.001 MW | 1.34102 hp | 3,412 BTU/hr | Small heater |
| 2 kW | 2,000 W | 0.002 MW | 2.68204 hp | 6,824 BTU/hr | Toaster oven |
| 3 kW | 3,000 W | 0.003 MW | 4.02307 hp | 10,236 BTU/hr | Electric kettle |
| 5 kW | 5,000 W | 0.005 MW | 6.70511 hp | 17,061 BTU/hr | Home solar (avg) |
| 7.5 kW | 7,500 W | 0.0075 MW | 10.0577 hp | 25,591 BTU/hr | EV slow charge |
| 10 kW | 10,000 W | 0.01 MW | 13.4102 hp | 34,121 BTU/hr | Large solar array |
| 50 kW | 50,000 W | 0.05 MW | 67.051 hp | 170,607 BTU/hr | EV DC fast charge |
| 100 kW | 100,000 W | 0.1 MW | 134.102 hp | 341,214 BTU/hr | Small factory |
| 1,000 kW | 1,000,000 W | 1.0 MW | 1,341.02 hp | 3,412,141 BTU/hr | Wind turbine |
The kW to W conversion is one of the simplest in all of science: multiply by 1,000. This is because the SI kilo- prefix means exactly 10³ = 1,000 by definition. There is no rounding, no gravitational constant, no empirical factor — it is a pure mathematical relationship. 1 kW = 1,000 W and 1 W = 0.001 kW, always, everywhere, exactly.
Power (kW) and energy (kWh) are related but different quantities. Energy = Power × Time. A 2 kW (2,000 W) heater running for 3 hours consumes 6 kWh of energy. Electricity bills charge for energy (kWh), not power (kW). Understanding the kW to W conversion is essential for correctly calculating energy consumption from appliance power ratings and usage times.
Common power levels: smartphone charger ≈ 5–20 W (0.005–0.02 kW); LED lamp ≈ 10 W (0.01 kW); laptop ≈ 45–100 W (0.045–0.1 kW); microwave ≈ 1,000–1,500 W (1–1.5 kW); electric car charger ≈ 7–150 kW (7,000–150,000 W); residential solar system ≈ 3–10 kW (3,000–10,000 W); large wind turbine ≈ 2,000–6,000 kW (2–6 MW).
1 kW = 1,000 W = 0.001 MW = 1,000,000 mW = 1.34102 hp = 3,412.14 BTU/hr = 1.35962 PS
Mental shortcut: multiply kW by 1,000 to get watts. Divide watts by 1,000 to get kW. Example: 2.4 kW × 1,000 = 2,400 W (a standard microwave oven).
Converting kilowatts to watts is a simple multiplication. Follow these steps for complete multi-unit power conversions:
LED lamp: 0.01 kW = 10 W | Laptop: 0.065 kW = 65 W | TV (55"): 0.1 kW = 100 W | Refrigerator: 0.15 kW = 150 W | Microwave: 1.2 kW = 1,200 W | Kettle: 2.4 kW = 2,400 W | Oven: 3.0 kW = 3,000 W | EV charger (home): 7.4 kW = 7,400 W
The most frequent error is confusing power (kW) with energy (kWh) — a kilowatt is a rate of power, while a kilowatt-hour is a quantity of energy. They are not interchangeable. Another common mistake is mixing up kW, kVA, and kVAr in electrical systems — kW is real power, kVA is apparent power, and kVAr is reactive power; they are equal only when the power factor is 1.0. Always confirm whether a quoted value is real power (kW) or apparent power (kVA) before converting to watts.
In solar energy and renewable power, solar panel systems are rated in kilowatts (kW peak capacity), but individual panel outputs and inverter specifications are often given in watts. A 6.6 kW solar system might consist of 20 panels each rated at 330 W — the kW to W conversion is used constantly in system design, quoting, and monitoring. In electric vehicle charging, home wallbox chargers are rated at 7.4 kW or 22 kW (7,400 W or 22,000 W), DC fast chargers at 50–350 kW, and ultra-rapid chargers at 150–350 kW — all requiring conversion to watts for cable sizing, circuit breaker selection, and load calculations. For related energy content calculations, see our BTU to Joules converter.
In electrical engineering and circuit design, component power ratings (resistors, capacitors, transistors) are specified in watts or milliwatts, while system-level power budgets are discussed in kilowatts. Converting between the two is a routine step in every design review. In HVAC and building services engineering, air conditioning units are rated in kW (cooling capacity), but compressor motor power draw, fan motor power, and heat exchanger performance are frequently given in watts. For related force and mechanical power conversions used in engineering, see our kilonewtons to tonnes converter.
The National Institute of Standards and Technology provides authoritative definitions of the watt, kilowatt, and all SI power units used in electrical engineering, physics, and commerce worldwide in 2026.
Visit NIST →The watt (W) is the SI coherent unit of power, equal to one joule per second. Named after James Watt, it is used across all disciplines from microelectronics to power generation. The kilowatt (1,000 W) is the most commonly used multiple in everyday electrical and mechanical engineering contexts.
Our kW to Watts Tool →Explore our full library of free unit conversion tools for power, energy, force, speed, pressure, weight, area, distance, and time. All tools are updated for 2026 standards and fully optimised for mobile and desktop use.
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