Free resin and epoxy cost calculator. Enter mold dimensions (rectangular or cylinder), resin price per gallon, density, waste percentage, additives, and amortized mold cost; outputs the exact volume, weight, and total cost per pour.
Use before pricing a resin piece for sale, or when comparing whether a cheaper bulk resin or a different mold-amortization schedule meaningfully changes your per-piece cost.
Like the 3D Print Cost & Profit Estimator, this converts a physical volume into a material cost, but resin's waste percentage and mold amortization play the role that 3D printing's failure buffer and printer wear play.
Volume is computed from mold dimensions — length × width × depth for rectangular molds, or π × (diameter ÷ 2)² × depth for cylinders — converted from cubic inches to gallons by dividing by 231.
A waste/cure-loss percentage is added on top to cover mixing cup residue and stir-stick drag, then converted to weight using resin density in lb/gallon.
Total cost = resin cost (volume × price per gallon) + flat additive/pigment cost + mold cost amortized over its expected number of uses.
Fill the empty mold with water and measure the poured volume in a graduated cup, or use the dimension formula this calculator applies — length × width × depth for rectangular molds, or π × (diameter ÷ 2)² × depth for cylinders.
Mixing cup residue, stir-stick drag, and trimmed overflow all add loss beyond the mold's exact volume. The waste/cure-loss percentage field bakes that overage into the total.
The mix ratio doesn't change the poured volume, but different ratios come in differently sized part-A/part-B bottles, which can shift your effective price per gallon — enter the actual price you pay per gallon of combined mixed resin.
输入
Rectangular mold 6" × 4" × 1", $45/gallon resin, 9.1 lb/gal density, 3% waste, $1.50 additive, $20 mold amortized over 50 uses.
输出
Volume 0.107 gal (24 in³) → total cost $6.72.
24 cubic inches converts to 0.104 gallons, plus 3% waste brings it to about 0.107 gallons weighing roughly 0.97 lb. Resin cost is $4.82, plus $1.50 additive and $0.40 mold-per-use ($20 ÷ 50 uses), for a total pour cost of about $6.72.