Duct Calculator Overview
Duct Size Calculator
Get instant, accurate duct sizing calculations for your HVAC system. Our calculator helps you determine the optimal duct dimensions based on airflow requirements and system specifications.
Calculate Duct Size
Air Flow Rate (CFM)
Maximum Velocity (FPM)
Maximum Static Pressure Loss (inches of water per 100 ft)
Duct ShapeRound
Diameter (inches)
Duct Length (feet)
Calculate
Why You’ll Love Our HVAC Duct Calculator
Whether you’re a seasoned HVAC professional or a DIY enthusiast, this tool will speed up your duct design and improve the precision of your calculations. With real-time, accurate results, you’ll save time and reduce errors.
For rectangular ducts, you can specify your preferred aspect ratio (width:height) to ensure the duct dimensions match your space constraints. For example, a 2:1 ratio means the width will be twice the height, helping you design ducts that fit perfectly in your available space.
How to Use the HVAC Duct Calculator
1. Input Data:
Enter key details like airflow rate, duct shape, and dimensions.
2. Calculate:
Hit the “Calculate” button, and the tool will instantly give you your results.
3. Review Results:
See the required duct size, airflow velocity, and friction loss.
4. Adjust & Reset:
Update inputs easily if needed, and recalculate in seconds.
How to Calculate HVAC Duct Size?
1. Determine Airflow Requirements
First, calculate the required airflow (CFM) for the space, considering temperature and ventilation needs.
2. Choose a Sizing Method
Select from the velocity, equal friction, or static regain method based on your project.
3. Calculate Duct Velocity
Use airflow and duct area to determine the required velocity for your ducts.
4. Determine Duct Size
Find the duct size that fits your required airflow and velocity while considering space and system compatibility.
5. Account for Friction Loss
Factor in the friction caused by airflow resistance to ensure the duct system is efficient.
6. Check & Revise
Verify that the calculated duct size meets your system’s needs and adjust if necessary.
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Originally Published at – Field Promax (HVAC Duct Calculator)
