Enter the total pressure (lbf/ft^2), the total CFM (ft^3/min), and the area (ft^2) into the calculator to determine the Static Pressure From CFM. 

Static Pressure From CFM Formula

The following formula is used to calculate the Static Pressure From CFM.

Pstatic = Ptotal – ((CFM/A)/4005)^2

  • Where Pstatic is the Static Pressure From CFM (lbf/ft^2)
  • Ptotal is the total pressure (lbf/ft^2) 
  • CFM is the total CFM (ft^3/min) 
  • A is the area (ft^2) 

How to Calculate Static Pressure From CFM?

The following example problems outline how to calculate the Static Pressure From CFM.

Example Problem #1

  1. First, determine the total pressure (lbf/ft^2). In this example, the total pressure (lbf/ft^2) is given as 100 .
  2. Next, determine the total CFM (ft^3/min). For this problem, the total CFM (ft^3/min) is given as  30 .
  3. Next, determine the area (ft^2). In this case, the area (ft^2) is found to be 2.
  4. Finally, calculate the Static Pressure From CFM using the formula above: 

Pstatic = Ptotal – ((CFM/A)/4005)^2

Inserting the values from above and solving yields: 

Pstatic = 100 – ((30/2)/4005)^2 = 99.99 (lbf/ft^2)


Example Problem #2

Using the same method as above, determine the variables required by the equation. For this example problem, these are provided as:

total pressure (lbf/ft^2) = 500

total CFM (ft^3/min) = 40

area (ft^2) = 4

Enter these given values yields: Pstatic = 500 – ((40/4)/4005)^2 = 499.99 (lbf/ft^2)