Composites World / NetComposites

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NetComposites Ltd has transferred the rights and ownership of this website to Gardner Business Media Inc.

On 1st January 2020, NetComposites' media assets including, newsletters and conferences were transferred to Composites World (Gardner Business Media).

This site is no longer being updated. Please direct all enquiries to

For further details see our joint press release.

Cured Ply Thickness Calculator

This tool calculates the individual cured ply thickness in a laminate, given: the areal weight of the reinforcement fibres (in g/m2); the density of those fibres (in g/cm3); and the weight fraction and density of the matrix resin. (A second calculator is provided to convert volume fraction of fibres to weight fraction of resin – this uses the same weight and density data entered into the ply-thickness calculator.) The tool does not take into consideration any content of voids in the ply/laminate.

Reinforcement Density (g/cm3)
E-Glass 2.56
Carbon 1.75–1.95
Aramid (Kevlar 49) 1.45
Resin 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

Areal Weight Fibres (g/cm2)


Density (g/cm3)


Weight Fraction Resin (%)

Not sure of your resin weight fraction? Use our handy Volume-weight fraction calculator.



Resin Fibre Ratio: Ply Thickness: mm

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