# Pump Horsepower

Written by Jerry Ratzlaff on . Posted in Pump

## 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.