# Pump Horsepower

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

## 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.