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Composite Mold Materials Calculator

Estimator for Composite Molds Built with Chopstrand Mat

The calculator below is to estimate the amount of material you will need to make a solid laminate mold or even a part from chop strand mat and polyester, vinyl-ester, or isophthalic resins. 

Simply enter in the square feet of your mold or laminate and the desired thickness and it will calculate how many layers of 1.5 oz chop strand mat, gallons of resin, gelcoat for 1 side, yards of mat needed (in 50” or 38” widths) and  catalyst is needed. 

IMPORTANT: This is an estimation, it does not take into account wastage (how much resin is left in the bucket or gets spilled on the floor). Final laminate thickness can vary due to a number of factors such as differing laminating styles, geometry, etc.

Copy of Mold Materials Calculator Hydrophonic

Thickness - inches
Surface area of mold - Sq. Feet
Layer's of 1.5oz Chop Strand Mat
Approximate weight of Mat - LBS
Resin needed - Gallons
Does not include wastage
Gelcoat needed - Gallons
Does not include wastage
Yards of Chop Strand Mat 50"
Yards of Chop Strand Mat 38"
Catalyst Needed in ounces
1.5% Catalyst Ratio
Change the cells for Thickness and Surface area then click update to get results.

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Fiberglass Supply 
 11824 Water Tank Rd. Burlington
 Washington, 98233 USA
Phone; (509) 493-3464