FPM to CFM Calculator

Convert FPM (feet per minute) to CFM (cubic feet per minute) or calculate cross-sectional area using the FPM to CFM Calculator. Essential for HVAC and ventilation design.

Enter any two values—FPM (feet per minute), area, or CFM (cubic feet per minute)—to compute the missing parameter using the FPM to CFM Calculator.

The FPM to CFM Calculator simplifies the process of converting air velocity (FPM) to airflow volume (CFM) or vice versa, based on the cross-sectional area.

This tool is particularly useful in HVAC, industrial ventilation, and ductwork design, enabling accurate airflow calculations to optimize system performance.

Formula

CFM = $\text{FPM} \times \text{Area}$
FPM = $\frac{\text{CFM}}{\text{Area}}$
Area = $\frac{\text{CFM}}{\text{FPM}}$

Variable	Description	Units
FPM	Feet per minute (velocity)	ft/min, m/min
Area	Cross-sectional area	sq ft, sq m, sq yd
CFM	Cubic feet per minute	CFM, m³/min

Solved Calculations

Example 1: Calculate CFM
An airflow velocity of 300 ft/min passes through an area of 2 sq ft. Find the airflow in CFM.

Step	Value	Explanation
Step 1	FPM = 300, Area = 2 sq ft	Input known values.
Step 2: Formula	$\text{CFM} = \text{FPM} \times \text$	Use the CFM formula.
Step 3: Calculate	$\text{CFM} = 300 \times$	Multiply FPM by area.
Result	600 CFM	The airflow is 600 cubic feet per minute.

Example 2: Calculate FPM
An airflow of 1000 CFM passes through an area of 4 sq ft. Find the velocity in ft/min.

Step	Value	Explanation
Step 1	CFM = 1000, Area = 4 sq ft	Input known values.
Step 2: Formula	$\text{FPM} = \frac{\text{CFM}}{\text{Ar$	Use the FPM formula.
Step 3: Calculate	$\text{FPM} = \frac{1000}{4}$	Divide CFM by area.
Result	250 ft/min	The velocity is 250 feet per minute.

More Calculators