Filtration Efficiency Calculator

Calculate MERV/HEPA filter efficiency, CADR, penetration, and pressure drop for different particle sizes.

MERV Rating (1–20)

Particle Size Range

Airflow (CFM)

Filter Face Area (sq ft)

Tab to move between fields

Filter Efficiency (%)

80%

Penetration (%)20%

Clean Air Delivery Rate (CFM)320

Face Velocity (fpm)100

Est. Pressure Drop (in. w.g.)0.01

How to Use This Calculator

Enter MERV Rating (1–20), Particle Size Range, and Airflow (CFM).
Set Filter Face Area (sq ft).
Review the Filter Efficiency (%) (%) result.
Use Penetration (%) (%) and Clean Air Delivery Rate (CFM) to inform your decision.

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