Free Epoxy Resin Calculator

Common resin calculation questions

How do I calculate how much resin I need?

Measure your mold's dimensions (length, width, depth for rectangular molds, or diameter and depth for round molds). Use our Resin Mold Volume Calculator to convert measurements into exact resin amounts needed.

What's the mixing ratio for most resin brands?

Most craft resins use a 1:1 ratio (equal parts A and B), but some brands use 2:1 or 4:1 ratios. Always check your specific resin brand. Our Resin Ratio Calculator covers all common ratios with reference tables, or use the Small Batch Mixing Calculator for quick craft-batch amounts.

How much pigment should I add to resin?

For opaque colors, use 6-10% pigment by weight. For transparent tints, use 2-4%. Use our Color Mixing Calculator for exact amounts based on your desired intensity.

Should I measure resin by volume or weight?

Always measure by weight using a digital scale. Volume measurements using cups can be inaccurate due to air bubbles and resin density variations. Weight is the most reliable method.

How much extra resin should I mix?

Mix 10-15% more than your calculated amount. This accounts for waste in mixing cups, air bubbles you'll pop, and the resin that sticks to stirring tools. Use our Waste/Buffer Calculator for precise recommendations.

Resin grams to ml: how to convert resin measurements

For most epoxy resins, 1 ml weighs approximately 1.1 grams (density ~1.1 g/ml). To convert grams to ml, divide by 1.1. To convert ml to grams, multiply by 1.1. For example, 100 ml of resin weighs about 110 grams. Always check your specific brand's data sheet for exact density, as some specialty resins may differ slightly.

Can I mix different resin brands together?

No, never mix different resin brands or formulas together. Each brand has specific chemical ratios. Mixing brands can result in tacky resin that never fully cures. Stick to one brand per project.

How do I calculate resin for multiple items?

Calculate resin for one item, then multiply by the number of items you're making. Add 10% extra for waste. For batch production, use our project-specific calculators like the Keychain Calculator or Coaster Calculator.

Which resin calculator should I use first?

Start with the quick calculator at the top of this page to get a rough estimate of how much resin you need. Then use our Mold Volume Calculator for precise measurements, or choose a project-specific calculator like Jewelry, Coasters, or Bookmarks for pre-set dimensions and batch calculations.

How do I get rid of bubbles in resin?

The fastest fix is a heat gun or torch held 2–3 inches above the surface in smooth passes, within 10–20 minutes of pouring. But persistent bubbles usually have a specific cause — cold resin, fast mixing, or unsealed wood — that a heat gun alone won't solve. Use our Resin Bubble Troubleshooter to diagnose the root cause and get the exact fix for your project type.

Why is my resin still sticky after curing?

Sticky resin after 24 hours is almost always a wrong mixing ratio — usually from measuring Part A and Part B by volume using cups rather than by weight on a digital scale. Other causes include cold workspace temperature, too much colorant, or high humidity. Use our Sticky Resin & Cure Time Guide to diagnose the exact cause and get the specific fix for your situation.

Is epoxy resin food safe?

Fully cured, FDA-compliant resin is safe for incidental food contact — such as a mug resting on a coaster — but not for cutting boards, direct food storage, or dishwasher use. Brand matters: ArtResin, TotalBoat TableTop Plus, and Stone Coat Countertops carry FDA compliance claims; most budget craft resins do not. See the Food Safe Epoxy Guide for a brand-by-brand table and a free Food Safety Checker for your specific project.