Epoxy Resin Calculator
Enter your mold's dimensions and your resin's mix ratio to find the total volume and the resin/hardener split.
How epoxy resin volume is calculated
Volume in milliliters is found by multiplying the mold's length, width, and depth in centimeters, since 1 cubic centimeter equals 1 milliliter. This total volume is then split between resin and hardener according to your product's specific mix ratio.
Mix ratios vary significantly by product — some epoxies use a 1:1 ratio by volume, while others use ratios like 2:1 or 3:1. Always use your specific product's recommended ratio, since using the wrong ratio can result in resin that doesn't cure properly.
Frequently asked questions
Why does the mix ratio matter so much?
Epoxy cures through a chemical reaction between the resin and hardener in specific proportions. Using too much or too little hardener relative to the resin can result in a batch that stays tacky, cures unevenly, or doesn't harden at all.
Is mix ratio always by volume, or sometimes by weight?
This varies by product — some manufacturers specify mix ratios by volume, others by weight, and the two can give different actual quantities since resin and hardener often have different densities. Always check whether your specific product's instructions are by volume or weight.
Should I account for extra resin beyond this exact calculation?
Yes — it's common practice to mix slightly more than the exact calculated volume to account for mixing containers, stirring sticks, and application loss, especially for larger or more complex pours.