How to calculate static pressure from CFM

CFM to Static Pressure Calculator

This CFM to static pressure conversion helps you to calculate the static pressure airflow for the system efficiency and performance. Enter values, total pressure, total cfm and area into the converter and see cfm in the result.

CFM to Static Pressure Calculator





Your result will be displayed here.

How to Calculate Static Pressure from CFM

The formula to determine static pressure from total pressure, airflow (CFM), and duct area is:

Static Pressure=Total Pressure(CFMArea×4005)2\text{Static Pressure} = \text{Total Pressure} – \left(\frac{\text{CFM}}{\text{Area} \times 4005}\right)^2

Example

Imagine a factory where air needs to be spread evenly across different sections. An engineer designs a duct system with 3000 CFM airflow and a total pressure of 3.0 lbf/ft². To keep the system running efficiently, they must make sure the static pressure stays stable. By adjusting the duct size and airflow, they can improve ventilation and save energy.

Steps:

  • Total Pressure: 2.5 lbf/ft²
  • Total CFM: 2500 ft³/min
  • Area: 5 ft²

Static Pressure=2.5(25005×4005)2\text{Static Pressure} = 2.5 – \left(\frac{2500}{5 \times 4005}\right)^2

Static Pressure=2.5(0.1248)2\text{Static Pressure} = 2.5 – (0.1248)^2

Static Pressure=2.50.0156=2.48\text{Static Pressure} = 2.5 – 0.0156 = 2.48

The static pressure is 2.48 lbf/ft².

💡 Key Point

Correct static pressure calculation helps prevent duct leaks, saves fan energy, and keeps the system running efficiently. Use this tool to improve your HVAC or ventilation system.

FAQS

1. What does this tool calculate?
It figures out the static pressure based on CFM, total pressure, and area.

2. Why is static pressure important?
It keeps airflow steady and prevents leaks or energy waste.

3. What values do I need?
Enter total pressure, airflow (CFM), and duct area.

4. Who should use this calculator?
HVAC designers, technicians, and facility engineers.

5. Can it improve system performance?
Yes, accurate pressure helps balance airflow and boost efficiency.

Summary

Parameter Description
CFM (Airflow) Measures air volume flowing through the system
Total Pressure Includes static and velocity pressure combined
Cross-Sectional Area Duct size in square feet
Static Pressure Formula Static Pressure = Total Pressure − (CFM ÷ (Area × 4005))²
Main Use Enhancing HVAC airflow control, duct design, and energy efficiency

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