∑ Swippe

Power Converter

Convert between watts, horsepower, kilowatts, BTU/h, and more.

9 units
6 decimals

1 W = 0.001341 hp

About the power converter

Convert power between SI (watt, kilowatt), mechanical (horsepower), and thermal (BTU/h) units. The SI derived unit is the watt (1 W = 1 J/s). Mechanical horsepower (745.7 W) and metric horsepower (735.5 W) differ slightly — always check which convention applies.

Common conversions

hp to kW kW to hp

Frequently asked questions

  • How many watts are in 1 horsepower?

    Mechanical horsepower equals approximately 745.7 W; metric horsepower (PS) equals 735.5 W.

  • What is 1 kW in BTU per hour?

    One kilowatt equals approximately 3,412.14 BTU/h.

  • How is power different from energy?

    Energy is the total amount of work done; power is the rate at which energy is transferred. 1 W = 1 J per second.

  • What is the SI unit of power?

    The watt (W).

More common converters

Length → Weight and Mass → Volume → Temperature → Area → Pressure → Energy → Speed →

Complete list of power units