Airflow Calculator
Calculate airflow in ducts, vents, and HVAC systems. Understand how duct size, velocity, and pressure affect airflow performance.
Step 1: Duct & Airflow Details
Understanding Airflow Calculations
Airflow is calculated using the duct cross-sectional area and air velocity. For round ducts, area = π × (diameter/2)². For rectangular ducts, area = width × height.
Step 2: Additional Options
About Static Pressure
Static pressure is the resistance to airflow in a duct system. Higher static pressure requires more fan power to maintain the same airflow. Typical residential systems operate at 0.5-0.8 inches of water column.
Airflow Calculation Results
Calculated Airflow
Duct Size Comparison
| Duct Size | Area | Velocity | Airflow | Pressure Drop |
|---|
Velocity vs Airflow Analysis
Airflow Calculation Formula
Q = A × V
The airflow (Q) is calculated by multiplying the cross-sectional area (A) of the duct by the air velocity (V). For round ducts, A = π × (d/2)². For rectangular ducts, A = w × h.
Need Professional HVAC Design?
Connect with our HVAC experts for system design, duct sizing, and airflow optimization for residential and commercial applications.
Get Professional Design