# Pump Horsepower

Written by Jerry Ratzlaff on . Posted in Pump

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.