Enter the flow rate in gallons per minute and the total head in feet into the calculator to determine the water horsepower (WHP).

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## WHP Formula

The following formula is used to calculate water horsepower.

WHP = Q*H/3960

- Where WHP is the water horsepower (hp)
- Q is the volumetric flow rater of the water (gpm)
- H is the head of the water (ft)

## WHP Definition

WHP is short for water horsepower. Water horsepower is defined as the amount of work per unit of time that a pump or flow of water can generate.

## Example Problem

How to calculate water horsepower?

**First, determine the volumetric flow rate of the water.**For this example problem, the volumetric flow rate of the water is found to be 50 gallons per minute (GPM)

**Next, determine the head of the water.**In this case, there is measured to be a total of 10 ft of head.

**Finally, calculate the water horsepower.**Calculate the water horsepower using the formula above:

WHP = Q*H/3960

WHP = 50*10/3960

WHP = .1262 hp