What does rule of mixtures calculate?

It estimates composite properties from constituent properties and volume fractions. P0 includes longitudinal and inverse transverse estimates.

Does this model account for fiber waviness?

No. The output is a simplified estimate and does not model waviness, interfacial strength, fabric architecture, or anisotropic constituents.

Can I enter properties other than modulus?

Yes, for simple rule-of-mixtures estimates you can enter a consistent property unit label and interpret outputs in that same unit.

ToolsConductScience tool

CompositesFree in-browser calculator

Rule of Mixtures Calculator.

Estimate simplified composite properties from fiber, matrix, and void volume fractions. For materials research, education, and protocol documentation only. Not a certified inspection, compliance, asset-integrity, or final acceptance tool.

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Validated2026-05-24

CitableMethods and citation included

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Try it out

Load example rule of mixtures data to see the full workflow

Composite inputs

Fiber property

GPa

Matrix property

GPa

Fiber volume fraction

Void volume fraction

Results

Longitudinal

139.2 GPa

Transverse

7.35608 GPa

Matrix fraction

0.4

Review notes

Rule-of-mixtures outputs are simplified estimates; architecture, waviness, and interfaces are not modeled.

Methods note

Uses E1 = Vf * Ef + Vm * Em and E2 = 1 / (Vf / Ef + Vm / Em), with Vm = 1 - Vf - Vv.

Scope and limitations

For materials research, education, and protocol documentation only. Not a certified inspection, compliance, asset-integrity, or final acceptance tool.

Results are deterministic calculations from the values entered here. Review units, assumptions, and measurement quality before using outputs in reports or protocols.

Method

Uses the tool-specific formulas and assumptions shown in the calculator output.

Validated

Last validated 2026-05-24. Calculations are designed for planning and documentation support; verify procurement decisions against manufacturer specifications or institutional SOPs.

How to cite

How to Cite

Rule of Mixtures Calculator (1.2.0). ConductScience, Inc. 2026. Available at: https://conductscience.com/tools/rule-of-mixtures-calculator

For materials research, education, and protocol documentation only. Not a certified inspection, compliance, asset-integrity, or final acceptance tool.

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