Enter the hose internal diameter, the dynamic water pressure, and hose length to determine the hose flow rate.

Hose Flow Rate Formula

The following formula is used to calculate a hose flow rate.

Q = (1946.6 * D ^ {1.857} * (P/L) ) ^ {.54}
  • Where Q is the volumetric flow rate in gallons per minute (GPM)
  • D is the internal diameter of the hose
  • P is the dynamic pressure of water.
  • L is the length of the hose

To calculate the hose flow rate, multiply 1946.6 by the internal diameter raised to the power of 1.857, then multiply by the result of the dynamic pressure over the length raised to the power of .54.

Hose Flow Rate Definition

A hose flow rate is defined as the total volume of water or fluid that moves through a hose per unit of time. This is most often measured in gallons per minute.

Hose Flow Rate Example

How to calculate a hose flow rate?

  1. First, determine the internal diameter.

    Measure the inner diameter of the hose.

  2. Next, determine the length of the hose.

    Measure the total length of the hose.

  3. Next, determine the dynamic pressure.

    This is the dynamic pressure at the hose bib.

  4. Finally, calculate the hose flow rate.

    Calculate the hose flow rate using the formula above.


What is a hose flow rate?

A hose flow rate is a measure the amount of water that moves through a hose opening per unit time.

hose flow rate calculator
hose flow rate formula