Epoxy resin mix calculators
Mix casting and laminating epoxies by weight with default densities. Set batch size, tweak gram targets, and copy the pour plan.
Epoxy systems often call for weight-based mixing to offset density differences between resin and hardener. These presets load with realistic density defaults (1.1–1.15 g/mL for resin, 0.95 g/mL for hardener) so the gram column is immediately useful.
You can switch back to volume mode at any time. Adjust the densities or total volume if your manufacturer specifies different numbers—everything recalculates instantly.
Popular use cases
- 1:1 tabletop resin for coasters, tumblers, and small crafts
- 2:1 laminating resin scaled to 750 mL or a full gallon
- 4:1 deep-pour river table batches sized to 5 liters
- 5:1 marine epoxy quarts with gram-level accuracy
Prep an epoxy pour
Load a 2:1 resin/hardener batch sized for 750 mL. Tweak densities, switch units, or scale the total before you start mixing.
Defaults: 750 mL total, 2:1 ratio, weight mode with resin 1.10 g/mL.
Epoxy ratios by project type
1:1 tabletop & crafts
Balanced resin and hardener volumes for coasters, tumblers, and art.
2:1 laminating & boatbuilding
Heavier resin ratios for fiberglass, marine, and structural work.
3:1 casting resin
Casting resins that call for slow hardeners and bubble control.
4:1 deep-pour river tables
Thick resin batches staged for live-edge tables and slabs.
5:1 marine & structural
High-strength marine epoxies with gram-first defaults for accuracy.
Guides & resources
Featured calculators
FAQs
Why mix epoxy by weight instead of volume?
Resin and hardener rarely share the same density. Mixing by weight ensures you hit the manufacturer’s stoichiometric ratio even if the liquids expand or contract with temperature. The calculator keeps the parts proportional while letting you override densities.
Can I reuse these presets for other batch sizes?
Yes. Enter a new total volume or weight in the modal—the ratio stays fixed. Save the grams to your notebook or print the copy-to-label line for quick reference.
What happens if I change the densities?
Updating the densities adjusts the gram outputs immediately while preserving the target volume split. Use SDS or tech-sheet data to dial in the exact numbers for your resin system.