What it helps you decide
Estimate mold volume and split manufacturer-defined resin ratios.
Resin craft planning
Mix enough resin for the mold—at the manufacturer’s exact ratio.
Estimate volume for rectangular or round molds, add a practical waste allowance, and split Part A and Part B by weight.
Start with the example
The values already filled in are a working example—not a recommendation.
- 1Choose the closest starting point.
- 2Replace the example with your real details.
- 3Read the live result and its important limits.
Your numbers
Mold and mix ratio
Use the filled example first. Then replace each field with a measured value or your best current estimate.
Step 1Answer one question at a time. Your example values stay available.
Important limit
Use the manufacturer’s ratio basis.
A 2:1 volume ratio is not automatically a 2:1 weight ratio. Confirm ratio basis, density, working time, maximum pour depth, temperature, PPE, ventilation, and cure instructions from the resin manufacturer.
About this free craft materials & fabrication tool
How to use the Epoxy Resin & Mold Volume Calculator
Estimate mold volume and split manufacturer-defined resin ratios. The calculator runs privately in your browser and is designed to make the assumptions behind the answer visible.
What to have ready
Measure the real mold, vessel, fabric, or batch; then use the exact supplier ratio, density, usage ceiling, cure instructions, and expected waste.
Key inputs: Mold shape; Length or diameter; Width (rectangle only); Fill depth; Molds / pieces.
How to use the result
Use the estimate to prepare a controlled test quantity. Confirm fit, cure, burn, color, strength, or cut yield before committing a full production run.
Ready for the connected version?
Turn the calculation into a repeatable workflow.
Batch Scale connects recipes, materials, costs, inventory, production, sales, and your storefront in one workspace.