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Table of Contents:

**BHP = 100QH/3960n**

**Where,**

Q = Flow Rate or Discharge

H = Total Head

n = Pump Efficiency

Brake Horsepower is defined as the actual or useful horsepower of an engine that is determined from a force exerted on a friction brake. Here the horsepower of an engine is recorded on a device called dynamometer. The advanced online Brake Horsepower Calculator is useful in calculating the brake horsepower of an engine by using the formula.

The Brake Horsepower is termed as the dynamometer connected to the drive shaft.

__Example__:

Calculate the Brake Horsepower (Water Horsepower) for the given details.

Flow Rate or Discharge (Q) = 25 gpm

Total Head (H) =15 ft

__Pump Efficiency (n) = 5__

__Solution__:

**Apply Formula:**

BHP = 100QH/3960n

BHP = 100*25*15/3960*5

**BHP = 1.89 HP**