Epoxy resin calculators that get the math right
Find out exactly how much epoxy to mix — in ounces, gallons, liters and Part A/B — before you open the kit.
Open the epoxy calculator →Calculators
Epoxy Resin Calculator
Rectangle, circle or custom volume → oz, gallons, liters, weight, A/B mix.
River Table Calculator
Length × width × depth × river gap percentage.
Deep Pour Calculator
Total volume plus number of layers by max pour depth.
Tabletop & Countertop
Coating coverage by square feet at 1/8" or any thickness.
Mold Volume Calculator
Water method or shapes for silicone molds.
Guides
How Much Epoxy Do You Need for a River Table?
Learn how to calculate how much epoxy a river table needs: measure the river gap, find the volume in cubic inches, convert to gallons, and add the right allowance for waste.
Epoxy Countertop Cost per Square Foot: The Formula and How to Use It
How to calculate the epoxy countertop cost per square foot from your own local prices: material formula, coverage math at 1/8 inch, supplies, and DIY vs professional quotes.
Deep Pour vs Tabletop Epoxy: What's the Difference?
Deep pour (casting) epoxy vs tabletop (coating) epoxy explained: viscosity, cure time, heat, pour depth, and which one to use for river tables, countertops, molds and coatings.
How to Fix Epoxy Bubbles: Causes, Fixes and Prevention
Why bubbles form in epoxy resin and how to fix them: while wet (heat, timing) and after cure (sanding, filling, recoating), plus prevention tips for coatings, river tables and molds.
How to Measure Resin Mold Volume with the Water Method
Step-by-step: measure how much epoxy resin a silicone mold holds using water and a kitchen scale, convert grams to ml and ounces, and avoid common mistakes.
Why EpoxyMath?
Mixing too little epoxy halfway through a pour is stressful; mixing too much wastes money. Our calculators use standard conversions (1 US gallon = 231 in³, 1 fl oz = 1.8047 in³) and show the formulas so you can check the numbers yourself. Everything runs in your browser — no sign-up and no tracking.