Epoxy resin mix calculators
Scale manufacturer-specified epoxy volume ratios, set the batch size, and optionally derive gram targets from exact product densities.
Epoxy manufacturers may specify a ratio by volume, by mass, or both. These presets calculate by volume only, so first confirm that the selected ratio matches the volume ratio in the exact product instructions.
A manufacturer’s mass ratio may be numerically different. Do not substitute a volume ratio for it. When the manufacturer permits converting its volume ratio, enter exact resin and hardener densities to derive optional gram targets.
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 volume calculations for common batch sizes
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 and a 2:1 resin-to-hardener ratio by volume.
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 epoxy volume ratios with optional density-derived gram targets.
Guides & resources
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FAQs
Can I use a volume ratio as a mass ratio?
No. Follow the basis specified by the manufacturer. A 5:1 ratio by volume may require a different numerical ratio by mass because resin and hardener densities differ. MixByParts currently scales volume ratios and can derive gram targets only from those calculated volumes.
Can I reuse these presets for other batch sizes?
Yes. Enter a new final volume and the selected by-volume ratio stays fixed. Use a manufacturer-specified mass ratio separately when the product instructions are given by mass.
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.