Resin Calculator: Epoxy Mix

Stop guessing how much epoxy to mix.

You set up YOUR resin once — its ratio (1:1, 2:1, 3:1, 100:45…), whether that ratio is by weight or by volume, and its density. From then on you just enter the mold and the app gives you the exact grams of part A and part B.

WORKS WITH ANY BRAND
Most resin calculators only work with one manufacturer's product. This one doesn't care what you bought: describe the resin on your label and the numbers come out right.

BY WEIGHT OR BY VOLUME — THE MISTAKE THAT RUINS A POUR
A 2:1 ratio by weight and a 2:1 by volume are not the same mix. With different densities for A and B, treating one as the other is the classic reason a piece stays tacky and never cures. The app asks you which one your label says, and does the conversion for you.

11 MOLD SHAPES
Box and rectangle, cylinder and coaster, sphere, dome, cone, pyramid, hexagon, coating layer, river table, geode and ring. Enter the measurements the way you take them with a ruler; the app works out the volume.

WHAT YOU GET FOR EVERY PIECE
• Grams of A and grams of B, and the millilitres of each
• Mold volume and volume with your waste margin
• Pigment by percentage of the total mix
• Cost per piece, if you enter the price of your kit
• Working time (pot life) for that resin

MIXING TIMER
A checklist with the exact grams for each step — cup, tare, part A, tare, part B, stir, pigment, pour — and a countdown for the working time, with the screen kept on while you have your hands in gloves.

SAVED RECIPES
Save the recipe for each piece with its notes (colour, mold, client) and load it back into the calculator whenever you make that piece again. Each saved recipe keeps its own copy of the resin settings, so editing a resin later never changes a recipe you already shared.

MULTIPLE PIECES
Twenty coasters in one pour: set the number of pieces and the amounts are multiplied for you.

METRIC AND IMPERIAL
Centimetres, millimetres or inches in; grams and millilitres, or ounces and fluid ounces, out.

SHAREABLE RECIPE CARD
Turn any recipe into a card you can send to a workshop group or post, in three colour styles.

WORKS OFFLINE
Everything is calculated on your phone. No account, no sign-up, nothing to upload.

This app calculates quantities. It does not replace the technical sheet and label of your resin: always follow the manufacturer's instructions for ratio, mixing time and layer thickness.

Recent changes:
Small improvements and fixes.