Epoxy Resin Calculator
Find out exactly how much resin and hardener to mix for your mold, in both volume and weight, with your exact mix ratio.
Extra to cover mixing-cup residue — most crafters use 10-15%.
:
Check your resin's label — this varies a lot by brand.
Most epoxy resins are 1.05-1.15 g/ml — check your label for an exact figure.
How Much To Mix
Total Volume Needed
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Total Weight Needed
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Per Single Mold
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Full Breakdown
Part A (Resin) — Volume—
Part A (Resin) — Weight—
Part B (Hardener) — Volume—
Part B (Hardener) — Weight—
Volume Before Buffer—
Buffer Added—
About this tool
The Epoxy Resin Calculator tells you exactly how much resin and hardener to mix for your project — whether you're pouring a coaster, a tabletop, or a batch of identical molds — in both volume and weight.
How it works
- Pick your mold shape and enter its dimensions (or enter a known volume directly, e.g. from the water-displacement method).
- Set how many identical molds you're pouring, and a waste buffer to cover mixing-cup residue.
- Enter your resin's mix ratio (check the product label) and density.
- Click Calculate — you'll get the exact amount of resin (Part A) and hardener (Part B) to combine, in both ml/fl oz and grams/oz.
Measuring by weight on a scale is generally more accurate than measuring by volume for viscous resin, which is why this tool gives you both.