Free Epoxy Resin Calculator

Common resin calculation questions

How do I calculate how much resin I need?

Measure the mold's dimensions and calculate its volume. For a rectangular mold, use length × width × depth; for a round mold, use the cylinder formula based on diameter and depth. The Resin Mold Volume Calculator handles these conversions and adds an optional planning buffer.

What's the mixing ratio for most resin brands?

There is no single mixing ratio for all epoxy resin. Products may use 1:1, 2:1, 3:1, 4:1, or another ratio, and the stated ratio may be by volume or by weight. Follow the exact product label or Technical Data Sheet. Use the Resin Ratio Calculator after confirming the correct ratio, or the Small Batch Mixing Calculator for a known batch size.

How much pigment should I add to resin?

There is no universal pigment percentage that is safe for every resin and colorant. Follow the limits published for the epoxy and pigment you are using, because excessive or incompatible additives can affect cure or appearance. Use the Color Mixing Calculator as a planning estimate and test a small batch when needed.

What color do you get when mixing mica powders in resin?

Mica colors interact according to their pigments, but the cured result can also be affected by the resin's base tint, mica loading, opacity, and layer thickness. Use the Resin Color Mixing Chart to preview combinations and recipes, then test the actual materials before a large pour.

Should I measure resin by volume or weight?

Use the measurement method specified for the exact product. A ratio by volume is not automatically the same ratio by weight. ArtResin, for example, is 1:1 by volume, while MAS Table Top Pro is 1:1 by volume but 100:83 by weight. Never convert between methods unless the manufacturer provides the correct ratio.

How much extra resin should I mix?

A small planning buffer can cover resin left in the mixing container, minor spills, and imperfect geometry. The quick calculator uses an optional 10% buffer by default, but the right allowance depends on the project. Use the Waste/Buffer Calculator for a more specific estimate.

Resin grams to ml: how do I convert resin measurements?

There is no universal grams-to-ml conversion for epoxy resin because density varies by product and Part A and Part B can have different densities. The quick calculator's gram value is only an approximate total-mass estimate. Use the density or weight ratio in the exact product's Technical Data Sheet when precise conversion matters.

Can I mix different resin brands together?

Do not combine resin from one system with hardener from another unless the manufacturer explicitly says the components are compatible. Epoxy systems can use different chemistries, ratios, densities, and cure schedules, so treat the matched Part A and Part B supplied for a formula as one system.

How do I calculate resin for multiple items?

Calculate the resin volume for one item, multiply by the number of items, then add the planning buffer appropriate for the batch. For repeated projects, use a project-specific calculator such as the Keychain Calculator or Coaster Calculator.

Which resin calculator should I use first?

Start with the quick calculator at the top of this page when you know the mold dimensions and need a volume estimate. Use the Mold Volume Calculator for more shapes, the Resin Ratio Calculator for Part A and Part B planning, or choose a project-specific tool for jewelry, coasters, tumblers, bookmarks, and other projects.

How do I get rid of bubbles in resin?

Bubble prevention and removal depend on the resin and project. Common contributors include cold, viscous resin, air introduced during mixing, and porous materials releasing air. Follow the exact resin manufacturer's bubble-removal guidance and use the Resin Bubble Troubleshooter to identify the likely cause before applying extra heat.

Why is my resin still sticky after curing?

Common causes include an incorrect resin-to-hardener ratio, incomplete mixing, temperature outside the product's recommended range, or additives that interfere with cure. First compare the elapsed time with the exact product's published cure schedule, then use the Sticky Resin Guide to diagnose the symptoms.

How long does epoxy resin take to cure?

Epoxy cure time is product-specific rather than one universal number. ArtResin publishes a 72-hour full cure, while TotalBoat TableTop publishes a 5–7-day full cure. Temperature, mixed mass, pour depth, and hardener chemistry can also change the schedule. See the Epoxy Resin Cure Time Guide for manufacturer examples and cure-stage planning.

Is epoxy resin food safe?

Food-contact status is product- and use-specific. ArtResin states compliance with FDA 21 CFR 175.300 when fully cured and used as directed, while TotalBoat TableTop describes its cured product as suitable for limited food contact. Check the exact manufacturer's claim, cure requirements, heat limits, and intended use in the Food Safe Epoxy Guide.