Watt Unit Converter

Power Unit Converter

Power is measured in several units depending on context: watts for electronics, kilowatts for utility billing, horsepower for motors, and BTU per hour for heating and cooling. This converter translates between all common power units instantly.

Conversion Factors

All conversions pass through watts as the base unit:

$$1\,\text{kW} = 1000\,\text{W}$$ $$1\,\text{mW} = 0.001\,\text{W}$$ $$1\,\text{HP} = 746\,\text{W}$$ $$1\,\text{W} = 3.41214\,\text{BTU/h}$$

Horsepower here uses the electrical horsepower definition (746 W). BTU/h is commonly used for HVAC and heating equipment ratings.

Practical Uses

Compare a 1.5 kW space heater (1500 W) to a 5000 BTU/h window AC unit, or convert a 2 HP motor to watts for generator sizing. Related tools: Horsepower Calculator and Watts to Heat Calculator.

Frequently Asked Questions

How many watts are in one horsepower?

One electrical horsepower equals 746 watts. This is the standard used in motor and generator calculations in the US.

What is BTU per hour?

BTU/h measures thermal power, how much heat energy is transferred per hour. It is widely used for furnaces, air conditioners, and water heaters.

How do I convert kW to HP?

Multiply kilowatts by 1000 to get watts, then divide by 746. For example, 3 kW = 3000 W ≈ 4.02 HP.

Are milliwatts used in practice?

Yes. Milliwatts (mW) are common for low-power devices like LEDs, sensors, and radio transmitters. 1 W = 1000 mW.

Is kW the same as kWh?

No. kW is a rate of power (energy per time). kWh is a unit of total energy consumed over time. Multiply kW by hours to get kWh.

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Watt Converter

Power Unit Converter

Conversion Factors

Practical Uses

Frequently Asked Questions

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