Duct Sizing Calculator

Convert airflow to estimated duct area, round duct diameter, and rectangular duct size using a target velocity basis. Results update live as you type.

Required Area
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Round Diameter
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Rect Width
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Rect Height
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Inputs valid. Results update live as values change.

Engineering estimate only. Verify final values against project criteria, equipment submittals, manufacturer data, measured field conditions, and engineering judgment.

Need help applying this to a BAS sequence, air handler, trend review, or commissioning issue? Contact WEBC.