Fiberglass Weight Calculator

Density varies based on resin type, fiber content, and manufacturing method. Standard fiberglass averages 112 lb/ft³, but woven roving can be denser (120-130 lb/ft³) while chopped strand mat is lighter (90-100 lb/ft³). Resin-rich panels weigh more than fiber-rich ones.

Fiberglass is typically 75-80% lighter than steel for the same volume. A fiberglass panel that weighs 10 pounds would weigh around 43 pounds in steel. This weight advantage makes fiberglass ideal for boats, vehicles, and structures where weight matters.

Not exactly. Doubling thickness doubles weight but increases stiffness by roughly 8 times and strength by about 4 times. This is why thin fiberglass can be surprisingly strong for its weight, especially in layered composite designs.

Carbon fiber has a different density (around 97 lb/ft³ for most composites), so you'd need to adjust the density input. Carbon fiber is about 15% lighter than fiberglass but significantly stronger and more expensive.

Calculations are accurate within 5-10% for uniform panels. Real-world weights vary based on resin ratio, air voids, and manufacturing quality. Always add a 10% safety margin for structural applications or shipping estimates.