Airflow Conversion Calculator

Easily convert between different airflow units and calculate air velocity for circular and rectangular ducts.

Calculate the air flow past a point in a rectangular or circular duct per unit of time.

Air Velocity is measurement of the rate of displacement of air or gas at a specific location.

Rectangle Duct

Circular Duct

m/s

L/s

m³/hr

ft/min (LFM)

ft³/min (CFM)

miles/hr (MPH)

Convert between various airflow units (m³/s, L/s, m³/h).

Optimize smartflow duct sizing for your HVAC projects.

Calculate total system pressure drop including fittings.

Calculate required grille size based on airflow and target velocity.

Calculate energy savings and solar offset for HVAC projects.

Assess thermal comfort using PMV, PPD, and SET indices.