Enter the total feet per minute (FPM) and the area into the calculator to determine the cubic feet per minute (CFM). This calculator can also evaluate the FPM or area given the other variables are known.

FPM to CFM Formula

The following formula is used to calculate CFM from FPM. 

CFM = FPM * A
  • Where CFM is the cubic feet per minute
  • FPM is the feet per minute
  • A is the area (ft^2)

To calculate CFM from FPM, multiply the FPM by the area in square feet.

What is the difference between FPM and CFM?

FPM stands for feet per minute and is a unit of measure that describes length per unit time.

CFM stands for cubic feet per minute and is a unit of measure that describes volume per unit time.

To convert between the two, the length in FPM must be multiplied by the area to get volume.

How to calculate CFM from FPM?

Example Problem:

The following example outlines how to calculate CFM from FPM.

First, determine the total feet per minute. In this example, the feet per minute are measured to be 25 fpm.

Next, determine the area. For this problem, the area is measured to be 20 ft^2.

Finally, calculate the CFM using the formula above:

CFM = FPM * A

CFM = 25 * 20

CFM = 500