How to convert Feet Per Minute (FPM) to Cubic Feet per Minute (CFM)? The FPM to CFM Calculator is here to help. Just enter the values of FPM and area into the calculator, you can find the CFM quickly and accurately.
FPM to CFM Calculator
What is FPM to CFM?
FPM stands for Feet Per Minute, a unit that measures the speed of air movement. CFM stands for Cubic Feet per Minute, which measures the volume of air moved in a minute. Converting FPM to CFM helps understand the airflow rate in different applications.
How to Use the Calculator

Basic Calculator:
 Enter the FPM and Area (ft²) values.
 Example: FPM = 500, Area = 2 ft².

Advanced Calculator:
 Enter FPM, Length (ft), and Width (ft).
 Example: FPM = 500, Length = 2 ft, Width = 1 ft.
Formula
The formula to convert FPM to CFM is:
$\text{CFM} = \text{FPM} \times \text{Area (ft²)}$
Variable  Description 

FPM  Feet Per Minute 
Area  Area in square feet (ft²) 
Length  Length in feet (ft) 
Width  Width in feet (ft) 
CFM  Cubic Feet per Minute 
How To Convert FPM to CFM
Example 1
Input:
 FPM = 400,
 Area = 3 ft²
Calculation:
 CFM = 400 * 3
 CFM = 1200
Result: 1200 CFM
Example 2
Input:
 FPM = 300,
 Length = 2 ft,
 Width = 1.5 ft
Calculation:
 Area = Length * Width = 2 * 1.5 = 3 ft²
 CFM = 300 * 3
 CFM = 900
Result: 900 CFM
FAQs
1. What is the formula to calculate FPM (Feet Per Minute)?
The formula to calculate FPM is:
$\text{FPM} = \frac{\text{CFM}}{\text{Duct Area in square fee$
To calculate FPM, divide the air flow (CFM) by the crosssectional area of the duct in square feet. This formula helps in determining the velocity of air moving through the duct.
2. How do you calculate air flow (CFM) for ventilation?
Air flow (CFM) can be calculated using the formula:
$\text{CFM} = \frac{\text{Velocity (FPM)} \times \text{Area (sq ft)}}{1}$
This equation requires the velocity of the air and the crosssectional area of the duct to calculate the amount of air flow necessary for effective ventilation.
3. How do you calculate FPM in a duct?
To calculate the air velocity (FPM) in a duct, you need the CFM (Cubic Feet per Minute) and the duct’s crosssectional area. Use the formula:
$\text{FPM} = \frac{\text{CFM}}{\text{Duct Area (sq ft)}$
This will give you the velocity in feet per minute based on the air flow and duct size.
4. How do you calculate air flow rate from pressure?
Air flow rate can be calculated using Bernoulli’s principle or simplified formulas depending on the type of system. One common way is:
$\text{Air Flow (CFM)} = \frac{\Delta P \times 4005}{\sqrt{\text{Density}}}Final words$
Final Words
We hope you find the FPM to CFM Calculator helpful. How was your experience? If you encountered any issues, please report them on our “Report an Error” page. Your feedback is important to us.