🔄
Ultimate Epoxy Resin Calculator: Mold Volume & Mix Ratios
Login

Country

Cart

Your cart is empty

Ultimate Epoxy Resin Volume & Mix Calculator

Never mix too much (or too little) expensive resin again! Our Ultimate Epoxy Resin Calculator handles the complex math for any project. Whether you are pouring a geometric silicone mold, an oval paperweight, or doing a flood coat on a tabletop, simply enter your dimensions. We will instantly calculate your exact fluid volume, Part A / Part B mix ratio, and waste buffer.

Ultimate Resin Calculator

Calculate precise volume for any mold or surface.

For egg shapes, pebbles, or flattened spheres.

For a square base pyramid.

Calculates a standard 1/8" (3mm) self-leveling flood coat.

Fill mold with water, pour into a measuring cup, and enter the total fluid volume.

Total Mixed Resin Needed
0.00 oz
0 ml
Mixing Formula
Part A (Resin): 0.00 oz
Part B (Hardener): 0.00 oz
Note: Flood coats almost always require a 1:1 ratio resin. Double-check your manufacturer's label if you selected 2:1!

How to Calculate Epoxy Resin Volume

Epoxy resin is an incredible medium for artists, but it is expensive. Guessing the volume of your silicone molds often leads to mixing too much resin (wasting money) or mixing too little (leaving a visible seam line when you have to quickly mix a second batch). The Ultimate Resin Calculator above uses advanced geometric formulas to tell you exactly how many ounces or milliliters to mix for any shape—from simple coasters to 3D ovals and pyramids.

Understanding Resin Mix Ratios

Not all resins are created equal. You must read your manufacturer's label before mixing, as getting the ratio wrong will result in a sticky, tacky mess that never fully cures.

1:1 Ratio (Tabletop / Coating)

The most common ratio for beginners. This is typically a fast-curing "coating" resin meant for shallow pours (like coasters, tumblers, and surface flood coats) under 1/4 inch thick.

Mixing Rule:

Equal parts by volume. 50% Part A and 50% Part B.

2:1 & 3:1 (Deep Pour Casting)

These are "casting" resins. They cure much slower, which allows bubbles to escape easily. They are meant for thick, heavy projects like river tables, deep floral blocks, or large spheres.

Mixing Rule:

2 parts Resin to 1 part Hardener. Do not try to pour a 1:1 resin in a deep mold, or it will flash-cure and crack!

Pro Tips for Perfect Pours

  • The Waste Buffer: Our calculator allows you to add a 5% to 10% buffer to your total. We highly recommend using the 5% buffer! This accounts for the resin that inevitably sticks to the sides and bottom of your mixing cup.
  • Volume vs. Weight: This calculator measures by Volume (fluid ounces / ml), which is how 95% of consumer resins are designed to be mixed. Do not use a digital scale to weigh 1:1 resin, because Part A and Part B have different physical densities (weights). Always use graduated measuring cups.
  • The Water Method: If you have an odd-shaped, asymmetrical mold (like a bear, a geode, or a crystal cluster), fill it with water first. Pour that water into a measuring cup to find the total Milliliters. Dry the mold completely, then use the "Water Method" tab on the calculator above to find your exact ratio!

Frequently Asked Questions

Most standard consumer epoxy resins are formulated to be measured by Volume using a graduated measuring cup. Part A (Resin) is heavier and denser than Part B (Hardener). If you use a digital scale to weigh a 1:1 volume resin, your ratio will be incorrect and it may cure sticky. Always follow the manufacturer's instructions.
The industry standard for a self-leveling flood coat (poured at 1/8 inch thick) is 3 fluid ounces of mixed resin per square foot of surface area. You can select the "Surface / Table" option in our calculator to run this exact formula automatically.
Resin cures via an exothermic (heat-producing) chemical reaction. If you pour a "tabletop" 1:1 resin into a deep mold, the mass generates too much heat, causing it to "flash cure." This results in smoking, bubbling, and cracking. For deep molds (like pyramids, ovals, or spheres), you must use a slow-curing Deep Pour (2:1 or 3:1) resin.
To prevent bubbles: stir your resin slowly, warm your Part A bottle in a warm water bath before mixing, and pour the resin in a thin, slow stream. Once poured, lightly pass a butane torch or heat gun over the surface to pop any rising bubbles.