Home
Back
FPM to CFM Formula:
| From: | To: |
The FPM to CFM formula converts velocity (feet per minute) to flow rate (cubic feet per minute) by multiplying the velocity by the cross-sectional area. This is essential for HVAC systems, ventilation design, and airflow calculations.
The calculator uses the FPM to CFM formula:
Where:
Explanation: The formula calculates the volume of air moving through a given area per minute based on the velocity of the airflow.
Details: Accurate CFM calculation is crucial for proper ventilation system design, ensuring adequate air exchange rates, and maintaining indoor air quality in residential, commercial, and industrial settings.
Tips: Enter velocity in feet per minute and area in square feet. Both values must be positive numbers. The calculator will provide the flow rate in cubic feet per minute.
Q1: What is the difference between FPM and CFM?
A: FPM measures velocity (speed of air movement), while CFM measures volume flow rate (amount of air moving through a space per minute).
Q2: When is this conversion used?
A: Commonly used in HVAC design, ductwork sizing, fan selection, and ventilation system calculations for buildings and industrial processes.
Q3: How do I measure the area for the calculation?
A: Measure the cross-sectional area of the duct or opening. For rectangular ducts: length × width. For circular ducts: π × (radius)².
Q4: What are typical FPM values in ventilation systems?
A: Typically ranges from 500-2000 FPM for supply ducts and 600-900 FPM for return ducts, depending on the application and noise considerations.
Q5: Can this formula be used for liquids?
A: While the principle is similar, for liquids you would typically use different units (GPM instead of CFM) and account for fluid density variations.