Power Converter — HP to kW, Watts & BTU/h

Convert between horsepower (mechanical and metric), kilowatts, watts, BTU/h, and tons of refrigeration.

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How this conversion works. Every unit is converted through the watt (SI) with conversion factors from NIST Special Publication 811.

How to use

  1. Pick the unit you are converting from, such as Watt (W) or Kilowatt (kW).
  2. Type the value and every other unit updates as you type.
  3. Copy the figure you need, or use the swap button to reverse the direction, Ton of refrigeration (RT) included.

Frequently asked questions

How do I convert horsepower, mechanical to kilowatt?

1 horsepower, mechanical = 0.7457 kilowatt. Choose "Horsepower, mechanical (hp)" as From and "Kilowatt (kW)" as To, type a value, and the result updates instantly.

What is the difference between hp and metric hp (PS)?

Mechanical hp is 745.70 W (550 ft·lbf/s); metric hp (PS/CV) is 735.50 W (75 kgf·m/s). European car specs usually quote PS — about 1.4% smaller than hp.

How many kW is a ton of air conditioning?

One ton of refrigeration is 12,000 BTU/h = 3.517 kW of cooling capacity. A typical home split unit is 1–2 tons.

Is my data sent to a server?

No. Conversions run entirely in your browser using fixed factors — nothing is uploaded or logged.

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