# Pump Horsepower

## formula

A rapid method to estimate pump horsepower is by the following formula:

\(HP = \frac{GPM \Delta P}{1715 \eta}\)

Where:

\(HP\) = Pump Horsepower

\(GPM\) = Flow rate of liquid being pumped, GPM

\(\Delta P\) Added Pressure (discharge minus suction), psig

\(\eta\) = Pump efficiency

### notes

The expression can be rearranged to obtain \(\Delta P\) in terms of other variables.