MMAD Calculator is a free, web-based application that calculates the mass median aerodynamic diameter (MMAD) and geometric standard deviation (GSD) for an aerodynamic particle size distribution determined with an Andersen cascade impactor (ACI), Next Generation Impactor (NGI), or Marple Miller impactor. See the Calculations page for details on the methodology used.
The MMAD calculator for Next Generation Impactors (NGIs) is located below. The calculators for Andersen cascade impactors (ACIs) and Marple Miller impactors are on separate pages via the navigation menu.
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