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LunaCalc

Conversion

Power Converter

Convert watts, kilowatts, horsepower and more.

Calculator
SI units
Horsepower
Others

About this calculator

This power converter translates between watts, kilowatts, horsepower, and BTU per hour.

Formula notes

1 hp ≈ 745.7 W; 1 kW = 1000 W ≈ 1.341 hp; 1 BTU/h ≈ 0.293 W.

Worked examples

  1. Example: a 2 kW heater ≈ 2000 W ≈ 2.68 hp ≈ 6824 BTU/h.
  2. A 7.5 kW motor rating is about 10.06 mechanical horsepower using 745.7 W per hp.

How to use it

  1. Enter the power value and its unit.
  2. Read the equivalents across all units.
  3. Use watts for devices and hp for engines.

Frequently asked questions

Is metric horsepower the same as mechanical hp?

No. Metric PS is 735.5 W, while mechanical hp is 745.7 W.

Why do air conditioners list BTU/h?

BTU/h describes heat moved per hour; 12000 BTU/h ≈ 3.52 kW.

Limits and interpretation

  • Mechanical, metric, and boiler horsepower use different definitions; select the intended unit rather than the label alone.
  • Rated input power, shaft output power, and real operating consumption differ because of efficiency and load.

References