Polydispersity Index Calculator

Calculate the polydispersity index (PDI) to characterize molecular weight distribution

Weight Average Molecular Weight (Mw) g/mol

Number Average Molecular Weight (Mn) g/mol

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MyCalcBuddy Editorial Team

This page is maintained as an educational calculator reference.

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Formula Source: Chemistry: The Central Science

by Brown, LeMay, Bursten

ðŸ”„Last reviewed: May 2026

âœ“Formula checks are based on standard references and internal QA review.