How do I calculate how much epoxy resin I need?

To calculate how much epoxy resin you need, measure the inner length, width, and depth of your project in centimeters. Multiply them together (Length × Width × Depth) to determine the volume in cubic centimeters, which equals milliliters (ml). Next, add a 5% to 10% safety margin for mixing vessel cling and wood absorption, and divide the total volume by your manufacturer's mixing ratio (e.g., 2:1 or 1:1) to determine the exact resin and hardener requirements.

How to calculate for epoxy?

Calculating for epoxy requires two steps: calculating void volume and calculating the mixing split. For square or rectangular forms, use V = L × W × H. For cylindrical forms, use V = π × r² × H. Once you determine the total liquid volume in milliliters or fluid ounces, apply your resin's stoichiometric ratio to dispense Part A and Part B accurately.

How to calculate for resin?

To calculate for resin, always convert project dimensions to a unified unit (such as centimeters or inches). For metric measurements in centimeters, each cubic centimeter of mold volume requires 1 ml of mixed resin. If measuring in inches, multiply Length (in) × Width (in) × Depth (in) × 0.554 to convert cubic inches directly into fluid ounces.

How to calculate epoxy amount?

To find the total epoxy amount, calculate the physical displacement of the cavity. For a standard 30 × 30 cm serving tray poured 1 cm thick, the displacement is 900 cm³ (900 ml). With a recommended 10% buffer for squeegee and cup residue, the total epoxy amount is 990 ml. For a 2:1 system, this breaks down to 660 ml of Part A resin and 330 ml of Part B hardener.

How to calculate resin for a river table?

For a river table, measure the total board length and determine the average void width by taking measurements at 5 to 10 evenly spaced points along the live edge. Multiply Length × Average Width × Slab Thickness to estimate volume. Since live-edge timber absorbs resin and features irregular voids, add a 10% to 15% wastage buffer.

How much epoxy do I need for a 10x10 coaster?

For a square 10 × 10 cm coaster poured to a standard depth of 0.5 cm, the net volume is 50 ml (10 × 10 × 0.5). Adding a 10% buffer brings the total to 55 ml. In a 1:1 epoxy system, mix 27.5 ml of Resin (Part A) with 27.5 ml of Hardener (Part B). For a set of 4 coasters, you will need 220 ml in total.

What is the 2:1 resin ratio by weight vs volume?

A 2:1 volume ratio means 2 parts resin to 1 part hardener by liquid measure. Because Part A epoxy resin has a higher specific gravity (~1.15 g/ml) than Part B amine hardener (~1.00 g/ml), the scale weight ratio is approximately 2.3:1 by weight (100g Resin to ~43.5g Hardener). Always confirm weight ratios with our calculator to prevent sticky resin.

How do you calculate epoxy resin in liters or gallons?

To calculate liters, divide total cubic centimeters (or milliliters) by 1,000 (e.g., 2,500 ml = 2.5 Liters). To calculate US gallons, calculate cubic inches and divide by 231 (1 US liquid gallon = 231 cubic inches = ~3,785 ml). For example, a river table requiring 15,000 ml requires 3.96 US gallons of epoxy.

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About EpoxyResin-Calculator

We built EpoxyResin-Calculator.com to eliminate the guesswork, wasted chemical batches, and dangerous thermal runaway in resin woodworking, art casting, and composite fabrication.

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01Why We Created This Tool

Epoxy resin is one of the most versatile and stunning materials in modern craftsmanship—used in live-edge river tables, deep casting molds, high-gloss bar tops, carbon fiber lamination, and jewelry art. Yet, it is also notoriously unforgiving.

Under-measuring volume means scrambling to mix another batch mid-cure, resulting in visible seam lines, bubbles, and compromised bond integrity. Over-measuring wastes hundreds of dollars in high-grade polymers that flash-cure in the bucket. Worst of all, confusing volume ratios (like 2:1) with weight ratios without compensating for differing component densities causes tacky, un-cured projects or severe exothermic overheating.

We founded EpoxyResin-Calculator.com as an independent engineering resource to give craftsmen, makers, and DIYers an accurate, accessible mathematical modeling engine that operates right in their workshop on any phone, tablet, or desktop.

02Our Core Workshop Principles

Mathematical Precision

We implement true volumetric integration across rectangular river cavities, cylindrical pours, elliptical dishes, and rounded silicone molds, backed by customizable wastage margins (0% to 20%) to account for mixing cup loss and wood grain capillary absorption.

Density-Aware Weight Splits

Resin Part A and Hardener Part B rarely share identical densities. Our engine computes exact gram and ounce splits using manufacturer specific gravities, so you can weigh on digital scales with complete confidence.

Thermal Safety & Exotherm Warnings

Epoxy cross-linking generates exothermic heat. Our interface features built-in safety guidance on maximum recommended single-pour depths, layer stratification, and ambient temperature management to protect your workshop.

Zero-Data Privacy Commitment

Your workshop recipes and project dimensions are your intellectual property. 100% of calculations execute locally in your browser memory. We do not track, log, or store your measurements anywhere.

03Universal Chemical Formulation Support

Our calculator is built to be brand-agnostic and universally compatible with all commercial and craft chemical systems, including:

1:1 Volume (Bar Top & Coating)2:1 Volume (Deep Cast & River Tables)3:1 Volume (High Clarity Casting)4:1 & 5:1 Volume (Marine & Laminating)100:X Technical Weight Systems

Compatible with TotalBoat, EcoPoxy, SuperClear, West System, Craft Resin, Liquid Glass, MAS Epoxies, and custom industrial formulations.