Epoxy Resin Calculator: Precision Volume & Mixing Ratio Engine
Compute exact liquid volumes, wastage buffers, and Part A vs. Part B splits using our precision epoxy calculator and resin calculator for wood, art, and deep pours.
Quick Project Templates
2. Project Dimensions
Recommended pour depth: 0.3–0.6 cm for seal coats, up to 5 cm for deep pour castings.
Unit:
For irregular silicone molds: Fill your mold with water, weigh it or measure in ml, and enter here.
3. Wastage / Safety Margin Buffer
10% Buffer
Accounts for mixing cup cling, squeegee loss, and uneven live-edge voids.
10%
4. Manufacturer Mixing Ratio
Advanced Specific Gravities (TDS Overrides)
Epoxy resin is denser than hardener. Defaults: Resin = 1.15 g/ml, Hardener = 1.00 g/ml.
Calculated Resin Recipe
Ratio 2:1
Total Required Liquid Volume (incl. buffer)
990ml/33.5fl oz
Total Mixed Batch Weight:1,089g•2.40lbs
Batch Mixing Split Proportion66.7% A : 33.3% B
Part A (Resin)
By Volume
660ml
22.3 fl oz
By Scale Weight
759g
26.8 oz
Part B (Hardener)
By Volume
330ml
11.2 fl oz
By Scale Weight
330g
11.6 oz
Unit Conversions
Liters0.99 L
US Gallons0.26 gal
Kilograms1.09 kg
Pounds2.40 lbs
Recipe copied to clipboard!
Note: Epoxy densities and pot life vary by manufacturer. Always verify your specific product's technical data sheet (TDS) before large pours.
COUNTERTOPS • ART CANVASES • BAR TOPS
Resin Surface Coverage Estimator
Calculate how much coating resin you need based on surface area and pour depth.
Surface Dimensions
1 mm ≈ 1/25" • 2 mm ≈ 1/12"
Surface Coverage ResultCoating Resin
Total Surface Area:
0.60 m²(6.46 sq ft)
With 10% Waste Factor:
1,320ml/1.32 L
Equivalent: 44.6 fl oz • 0.35 gal
Batch Scale Weight (@ 1.12 g/ml):
1,478 g(3.26 lbs)
Rule of thumb: 1.0 Liter of mixed epoxy coats 1.0 square meter at 1.0 mm depth (or ~25 sq ft/gallon at 1/16").
WORKSHOP PRECISION CONVERTER
Epoxy Resin Volume & Weight Converter
Quickly convert between fluid milliliters, fluid ounces, grams, pounds, and liters using average uncured epoxy density (1.11 g/ml).
560 g
Quick Conversions:
Density calibrated: 1.12 g/ml
GEOMETRIC VOID MODELING
Mathematical Formulas by Mold Shape
Step-by-step Euclidean geometric volume calculation formulas used by the engine.
Fundamental chemical rules, stoichiometry calculations, and workshop methods for bubble-free curing.
How to Calculate Epoxy Resin Volume
To calculate how much epoxy resin is required for any project, start by computing the internal volume of your mold or casting area.
For rectangles and squares: Multiply Length × Width × Depth in centimeters. The result in cubic centimeters (cm³) is equal to milliliters (ml). For instance, a 30 cm × 30 cm tray at 1 cm thickness equals 900 ml.
Always incorporate a 5% to 10% safety margin buffer to account for cup wall cling, wood porosity, and level testing.
Formula: V = L × W × D (1 cm³ = 1 ml)
Mixing Ratio: Volume vs. Weight
Most commercial epoxy kits state mixing ratios by volume (e.g. 1:1 or 2:1 by volume). However, Part A (Epoxy Resin) is physically denser (typically ~1.15 g/ml) than Part B (Amine Hardener, ~1.00 g/ml).
If you weigh a 2:1 volume kit on a digital scale without adjusting for specific gravity, your mix will have too much hardener, resulting in flexible, rubbery resin or exothermic heat runaway.
Our calculator automatically solves the exact stoichiometric mass split so you can measure accurately with a digital scale.
Resin ~1.15 g/ml ≠ Hardener ~1.00 g/ml
Mastering Deep Pours & Exothermic Heat
Epoxy resin cures through an exothermic reaction (heat-generating chemical bond formation). Pouring too deep with standard tabletop epoxy causes thermal cracking, yellowing, and boiling.
For deep voids, river tables, and thick castings exceeding 2.5 cm (1 inch), always use a slow-curing "Deep Pour" formulation with a 48–72 hour pot life.
Keep workshop ambient temperatures between 21°C and 24°C (70°F–75°F) for optimal air release and curing.
Exotherm Control: 6 mm vs. 50 mm single pour
Authoritative Workshop Documentation
The Complete Guide to Using the Epoxy Resin Calculator for Precision Pours
Master liquid volumetrics, Part A and Part B stoichiometry, specific gravity corrections, and coverage depth formulas with our comprehensive epoxy calculator guide.
Working with epoxy resin is an exacting craft where structural chemistry and woodworking artistry meet. Whether you are building an ambitious live-edge river table, coating a hardwood countertop, casting intricate silicone art molds, or sealing custom bar tops, one immutable rule governs every successful pour: precision is essential. Guessing or estimating your liquid volume is the fastest way to compromise a workpiece. Pouring too little mixed resin leads to premature tackiness, uneven self-leveling, and unsightly cold seams where subsequent pours fail to fuse seamlessly. Conversely, overestimating resin wastes costly raw materials and creates unwanted chemical disposal challenges.
More critically, an inaccurate mix ratio disrupts stoichiometric polymerization. Epoxy is not a simple drying paint; it is a thermosetting copolymer that cross-links when Part A (epoxy resin base) reacts with Part B (polyamine curing agent). Deviating from the exact manufacturer ratio leaves unreacted chemical chains, producing sticky surfaces, amine blushing, reduced tensile strength, or catastrophic exothermic thermal runaway. Our specialized epoxy resin calculator eliminates human error, providing pinpoint liquid volumes and mass splits for both hobbyists and professional fabricators.
Why an Epoxy Calculator Must Separate Volume & Weight
Most commercial epoxy kits state mixing ratios by liquid volume, such as 1:1 or 2:1. However, Part A resin is physically denser (typically ~1.15 g/ml) than Part B amine hardener (~1.00 g/ml).
If you place a 2:1 volume kit on a digital scale and pour 200 grams of Part A with 100 grams of Part B, you have accidentally overdosed the hardener by roughly 15%. This disparity results in tacky finishes and rubbery castings. Our epoxy resin calculator solves the precise stoichiometric mass equation automatically, making it the most reliable epoxy calculator for dispensing on digital workshop scales.
Surface Area Coverage: Seal vs. Flood Coats
Surface coating projects demand distinct thickness calculations compared to deep casting boxes. Our specialized resin calculator features calibrated presets for every phase of flat surface finishing:
Seal Coat (1 mm / ~1/25"): Brushed or squeegeed over porous timber to seal wood grain and prevent trapped air bubbles.
Flood Coat (2 mm / ~1/12"): Poured liberally to achieve self-leveling glass-like sheen over countertops and slabs.
Art Glaze (3 mm / ~1/8"): High-depth protective coat for resin art, alcohol ink tiles, and photography panels.
A universal benchmark is that 1.0 Liter of mixed epoxy coats 1.0 square meter at 1.0 mm thickness (or roughly 25 to 30 sq ft per gallon at 1/16").
Core Mathematical Formulas Built Into the Resin Calculator
Our resin calculator utilizes Euclidean geometric equations paired with unit conversion factors to compute exact net fluid capacity. Here is how each geometry is evaluated:
When measured in centimeters, each cubic centimeter (cm³) converts cleanly into 1 milliliter (ml). A 30 × 30 × 1 cm tray equals exactly 900 ml of mixed epoxy.
Calculates cylindrical displacement. Treating circles as squares overestimates required resin by roughly 21.5%, needlessly driving up project expenses.
3. Live-Edge River Table VoidsVolume = Table Length × Average Void Width × Depth
Natural timber slabs have undulating contours. Measuring the gap width at 5 to 10 points and using the average width yields accurate river pours.
4. Irregular Molds (Water Displacement)Volume = Water Weight in Grams = Milliliters
For complex figurines or jewelry molds, fill the empty mold with water and weigh it. Because 1 g of water = 1 ml, input the grams directly into the tool.
The Crucial Role of Wastage Buffers in an Epoxy Calculator
One of the costliest errors in resin crafting is mixing only the theoretical cavity volume. In practical workshop environments, a measurable quantity of resin is always lost to container retention and application dynamics:
Mixing Cup Cling: High-viscosity resin adheres stubbornly to the inner walls and base of measuring buckets and stir sticks.
Porous Wood Absorption: Dry hardwood end-grain and knots draw in significant liquid polymer before reaching chemical saturation.
Edge Runoff & Dripping: Self-leveling countertop and canvas flood coats require controlled overflow to ensure total perimeter wetting without bare dry spots.
Our epoxy resin calculator provides configurable buffers: 0% (Exact) for non-porous lab testing, 5% (Standard) for silicone mold casting, and 10% (Recommended) for river tables and flood coats. Adding a 10% safety buffer guarantees you will never run out of resin mid-pour.
Managing Exothermic Reactions & Pour Depth Limitations
Epoxy curing generates thermal energy. If you pour tabletop resin too thick, heat cannot escape, resulting in thermal runaway where resin boils, bubbles, cracks, and yellows. When configuring any project in our epoxy calculator, matching your resin formulation to the planned pour depth is vital:
Resin Formulation
Recommended Depth
Pot Life
Primary Applications
Tabletop / Surface Epoxy
3 mm to 6 mm (1/8" to 1/4")
20 to 30 mins
Countertops, coasters, art glazing, seal coats
Deep Pour Casting Epoxy
25 mm to 50 mm (1" to 2"+)
120 to 360 mins
River tables, deep slab voids, thick castings
UV Craft Resin
1 mm to 3 mm (under UV lamp)
Instant (light-cured)
Small jewelry bezels, minor wood repairs
Maintain workshop ambient temperature between 21°C and 24°C (70°F to 75°F) with relative humidity below 50% for optimal bubble degassing and crystal-clear transparency.
How to Use the Epoxy Resin Calculator in 5 Simple Steps
Select Your Mold Geometry: Pick your project shape (rectangular slab, circular tabletop, oval dish, river void, or displacement volume).
Input Measured Dimensions: Enter length, width, diameter, and desired pour thickness in millimeters, centimeters, meters, inches, or feet.
Choose Your Safety Buffer: Apply a 5% to 10% safety margin to account for mixing bucket cling and surface absorption.
Define Mixing Ratio & Dispensing Mode: Enter your manufacturer's Part A to Part B ratio (1:1, 2:1, 3:1, etc.) and toggle between liquid volume (ml / fl oz) or digital scale weight (grams / oz).
Copy Recipe & Start Pouring: Review the precise Part A and Part B amounts generated by this resin calculator, click "Copy Workshop Recipe" for your shop clipboard, and mix for 3 minutes scraping all edges thoroughly.
Step-by-step mathematical answers to the most common queries searched by woodworkers, makers, and resin artists.
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.