ΣMyCalc
ΣMyCalc

Power Converter

Convert between watts, kilowatts, horsepower, BTU/h, and other power units.

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Conversion Result

1 Horsepower (hp)

→

745.7

Watts (W)

⚙️ Power References

1 horsepower = 745.7 watts

1 kilowatt = 1,000 watts

100 watts = 0.134 horsepower

1 megawatt = 1,341 horsepower

🔧 Common Power Ratings

LED light bulb: 8-12 watts

Microwave oven: 1,000-1,200 watts

Car engine: 100-500 horsepower

Electric motor: 0.5-10 kilowatts

How to Use the Power Calculator

Enter a power value, select the current unit (watts, kilowatts, horsepower, BTU/h, etc.), choose your target unit, and get instant conversion. Used in engineering, HVAC, and motor specifications.

Formula

All power values convert through watts (base SI unit). value_in_w = input × from_factor; result = value_in_w ÷ to_factor.

History & Interesting Facts

💡 Did You Know?

Horsepower was created by James Watt to compare steam engines to horses. 1 hp is roughly the power of 1 horse pulling, but varies by standard.

Origin & History

The watt is the SI unit of power. Named after James Watt, the steam engine innovator. 1 watt = 1 joule per second.

Fascinating Facts

  • 1

    1 horsepower = 745.7 watts

  • 2

    1 kilowatt = 1,000 watts

  • 3

    1 megawatt = 1 million watts

  • 4

    Metric horsepower (ps) = 735.5 watts (DIN standard)

  • 5

    Typical home uses 1-2 kilowatts continuously

  • 6

    Car engines: 50-500 horsepower typical

Frequently Asked Questions

What is a watt?

A watt is the SI unit of power. 1 watt = 1 joule per second. It measures the rate of energy transfer.

How many watts is 1 horsepower?

1 horsepower = 745.7 watts. This varies slightly by standard (imperial vs metric horsepower).

How much power does a typical home use?

A typical home uses 1-3 kilowatts continuously, with peak demand during heating/cooling seasons around 5-10 kW.

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