# Pump Efficiency

Written by Jerry Ratzlaff on . Posted in Pump

Pump efficiency, abbreviated as n, is the ratio of total horsepower output to shaft horsepower input of the pump or power output to power input.

### Pump Efficiency formula

$$\large{ n = \frac{ \rho \; G \; Q \; h }{ P } }$$

Where:

$$\large{ n }$$ = pump efficiency

$$\large{ \rho }$$  (Greek symbol rho) = fluid density

$$\large{ Q }$$ = flow rate

$$\large{ h }$$ = head

$$\large{ P }$$ = power input

$$\large{ G }$$ = universal gravitational constant