Ductwork Calculator — CFM, Duct Size, and Air Velocity
Enter CFM requirement and duct dimensions to calculate air velocity and static pressure.
Duct Parameters
Cubic feet per minute airflow
How to Use the Ductwork Calculator
Enter CFM requirement and duct dimensions to calculate air velocity and static pressure.
This free online ductwork calculator is designed for HVAC contractors and field technicians who need fast, accurate results on the job or during the estimating process. No account required — enter your values and get results instantly.
When to Use This Tool
- 1.During new construction estimates and material takeoffs
- 2.When verifying calculations in the field before ordering materials
- 3.For proposal and quote preparation — give clients accurate numbers
- 4.As a cross-check against manual calculations or software output
- 5.For training new technicians on correct sizing procedures
Important Notes
Results from this ductwork calculator are estimates based on standard industry formulas and typical conditions. Always verify critical calculations with manufacturer specifications, local codes, and a licensed HVAC contractor before proceeding with installation or ordering materials. Actual requirements may vary based on local building codes, site conditions, and project-specific factors.
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