Fiber Volume Fraction Calculator
V_f from weight fractions and densities — the layup-shop conversion.
Shops weigh, engineers think in volume — 70% fiber by WEIGHT in carbon/epoxy is only ~61% by volume. Vacuum infusion hits 55–60% V_f; hand layup languishes at 35–45%.
Formula
Fiber Volume Fraction Calculator is a free fiber volume fraction for design engineers, metallurgists and QA inspectors — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About Fiber Volume Fraction Calculator
V_f from weight fractions and densities — the layup-shop conversion. The calculation implements V_f = (w_f/ρ_f) / (w_f/ρ_f + w_m/ρ_m) (Composite manufacturing practice). Shops weigh, engineers think in volume — 70% fiber by WEIGHT in carbon/epoxy is only ~61% by volume. Vacuum infusion hits 55–60% V_f; hand layup languishes at 35–45%.
How to use Fiber Volume Fraction Calculator
- 1Enter Fiber weight fraction in % (From resin:fiber mix ratio).
- 2Enter Fiber density in kg/m³ (Carbon 1780 · glass 2550).
- 3Enter Matrix density in kg/m³.
- 4Read Fiber volume fraction, Composite density instantly — no submit button needed.
Why use Fiber Volume Fraction Calculator?
- ✓Implements the standard formula — V_f = (w_f/ρ_f) / (w_f/ρ_f + w_m/ρ_m)
- ✓Reference cited on-page: Composite manufacturing practice
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Fiber Volume Fraction Calculator use?+
It computes V_f = (w_f/ρ_f) / (w_f/ρ_f + w_m/ρ_m), per Composite manufacturing practice. The formula is displayed under the result.
What should I keep in mind when using this calculator?+
Shops weigh, engineers think in volume — 70% fiber by WEIGHT in carbon/epoxy is only ~61% by volume. Vacuum infusion hits 55–60% V_f; hand layup languishes at 35–45%.
Where do the material property defaults come from?+
Defaults are standard handbook values (ASM, manufacturer datasheets, the cited standard). Always substitute certified values from your material's test certificate for critical work.
Is the Fiber Volume Fraction Calculator free to use?+
Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
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