# Brake Horsepower

### Brake Horsepower formula

\(\large{ BHP = \frac {100Qh} {3960n} }\)

Where:

\(\large{ BHP }\) = brake horsepower

\(\large{ Q }\) = discharge flow rate

\(\large{ h }\) = total head

\(\large{ n }\) = total pump efficiency

\(\large{ WHP }\) = water horsepower

Solve for:

\(\large{ Q = \frac {3960 WHP} {h} }\)

\(\large{ h = \frac {3960 WHP} {Q} }\)

\(\large{ n = \frac {WHP} {BHP} }\)

\(\large{ WHP = \frac {Q h} {3960} }\)