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.

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## 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)

To calculate the static pressure from CFM, divide the CFM by the area, divide the result by 4005, square this result, then finally, subtract this from the total pressure.

## How to Calculate Static Pressure From CFM?

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

**Example Problem #1**

- First, determine the total pressure (lbf/ft^2). In this example, the total pressure (lbf/ft^2) is given as 100 .
- Next, determine the total CFM (ft^3/min). For this problem, the total CFM (ft^3/min) is given as 30 .
- Next, determine the area (ft^2). In this case, the area (ft^2) is found to be 2.
- 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)