Enter the volumetric flow rate and the cross-sectional area into the calculator to determine the linear flow rate.

Linear Flow Rate Formula

The following equation is used to calculate the Linear Flow Rate.

LFR = Q / A

  • Where LFR is the linear flow rate (ft/sec)
  • Q is the volumetric flow rate (ft^3/sec)
  • A is the cross-sectional area (ft^2)

To calculate a linear flow rate, divide the volumetric flow rate by the cross-sectional area.

What is a Linear Flow Rate?


A linear flow rate is a measure of the linear distance per unit time that a liquid of gas is moving at through an enclosed pipe or channel.

How to Calculate Linear Flow Rate?

Example Problem:

The following example outlines the steps and information needed to calculate linear flow rate.

First, determine the volumetric flow rate. In this example, the volumetric flow rate is measured to to be 12.5 ft^3/second.

Next, determine the cross-sectional area of the pipe. In this case, the cross-sectional area is measured to be 3 ft^2.

Finally, calculate the linear flow rate using the formula above:

LFR = Q / A

LFR = 12.5 / 3

LFR = 4.166 ft/second