Volume-Weight Fraction Calculator

This tool converts volume fractions to weight fractions (and vice versa) and calculates the overall density of a composite.

Reinforcement Density (g/cm3)
E-Glass 2.56
Carbon 1.75–1.95
Aramid (Kevlar 49) 1.45
Flax 1.4
Matrix Density (g/cm3)
Epoxy 1.1–1.4
Polyester 1.2–1.5
Polyamide (Nylon 6.6) 1.14
Polypropylene 0.9
PEEK 1.26–1.32

Volume / Weight Fraction


See also our Cured Ply Thickness Calculator.

Composite Density:

Fibre Volume: %

Fibre Weight: %

Fibre Density: g/cm3

Resin Volume: %

Resin Weight: %

Resin Density: g/cm3

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*While we've tried to make it as accurate as possible, this tool is provided as-is and it is the user's responsibility to check the suitability of any calculated data.