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HVAC CFM calculator

Calculate airflow from system capacity, room air changes, or duct velocity.

Choose what you know

Cooling capacitytonsDesign airflowCFM/ton

Follow the air path

Airflow is useful only when the calculation method matches the question you are trying to answer.

BLOWER

ROOM

System airflowDuct velocityRoom air changes

Do not use an air-change calculation as a cooling-load calculation.

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HVAC Judge provides general information and planning estimates, not a diagnosis, installation design, warranty decision, or contractor quote. Check equipment details with the manufacturer and use a qualified HVAC professional before repair, replacement, or installation.