# How is compressor horsepower calculated?

**horsepower**is equivalent to 745.8 watts. A watt meter allows you to

**calculate**the

**horsepower**of a

**compressor**by first finding its power in watts. Plug the

**compressor**into the watt meter. Note the number of watts of power the device draws.

Accordingly, how much HP does an AC compressor use?

The **compressor** takes about 20 **HP** to run, but it shuts off at throttle positions above 70% or so, depending on actual load and RPM. The alternator pulls another 5 - 15 under heavy load, which can occur when the fans kick on full due to the running **compressor**.

**HP**is

**horsepower**, or the amount of work that a motor can perform.

**HP**is not as important as pressure and flow in determining if your

**compressor**will work for you, as newer & more efficient

**compressors**can

**do**more with less

**HP**!

Also asked, what does HP mean for air compressors?

The larger the tank, the longer a job can be done at the **air** tool's required pressure before work must pause in order to rebuild pressure in the tank. **HORSEPOWER** (**HP**): **Horsepower** measures the work capacity of the motor or engine that drives the **compressor** pump.

A two-stage double-acting **reciprocating compressor** is the most energy-efficient **air compressor**. Typical specific power at 100 **psig** is approximately 15 kW/100 cfm to 16 kW/100 cfm.