Ductwork Calculator
Calculate ductwork sizing, airflow requirements, and materials needed for your HVAC project. Get precise calculations and cost estimates for any system.
Step 1: System Requirements
HVAC Requirements
Accurate system capacity and airflow calculations are crucial for proper duct sizing. CFM (Cubic Feet per Minute) determines duct cross-sectional area.
Step 2: Duct Specifications
About Duct Sizing
Proper duct sizing ensures adequate airflow with minimal pressure drop. Undersized ducts reduce efficiency and increase noise. Oversized ducts waste materials and increase costs.
Ductwork Calculation Results
Total Project Cost
Duct Sizing Recommendations
Duct Sizing Guidelines
For residential systems, aim for air velocities between 600-900 FPM in main ducts and 400-700 FPM in branch ducts. Pressure drop should not exceed 0.1 in WC per 100 ft of duct.
Material & Cost Breakdown
Duct Sizing Formula
Duct Area (sq ft) = Airflow (CFM) ÷ Velocity (FPM)
Calculate required duct area by dividing airflow in CFM by desired air velocity in FPM. Standard residential velocities: 600-900 FPM for supply, 500-700 FPM for return.
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