Epoxy Resin Calculator
Calculate exact pouring volume in gallons, fluid ounces, and milliliters — plus Part A & Part B digital scale weights (grams) for 1:1, 2:1, and 3:1 mix ratios.
Measure the gap between your left and right wood slabs at 5 evenly spaced marks along the mold length:
Exact Volume & Scale Weight
Buy a 1.5-Gallon Kit (or 1 Gal + 2 Quarts)
*Note: Resin is heavier than hardener (1.15 vs 0.97 g/mL), so a 1:1 volume mix weighs ~1.18:1 on a gram scale. Always verify against your bottle label.
How to Use This Epoxy Resin Calculator for Any Project
Whether you are coating a walnut dining table, casting a live-edge river channel, or filling a circular silicone mold, guessing your resin volume leads to two expensive mistakes: mixing too little and leaving a visible seam line mid-pour, or mixing too much and watching costly material overheat in the bucket.
Unlike basic store calculators that only multiply length by width at a fixed 1/8-inch thickness, our interactive tool supports rectangular surfaces, cylindrical molds, and irregular multi-point river channels. Even better, it converts your total fluid volume into exact Part A (resin) and Part B (hardener) gram readings so you can pour directly onto a digital kitchen scale without sticky measuring cup errors.
1. Select Geometry & Mode
Choose Rectangular Surface / Mold, Irregular River Table Channel (with 5 width measurement points), Circular Mold, or Garage Floor Coverage.
2. Enter Dimensions & Depth
Input your length, width (or multi-point channel widths W1–W5), and desired pour thickness in inches or millimeters, or click a one-tap thickness preset.
3. Set Mix Ratio & Waste Allowance
Select your system's volumetric mix ratio (1:1 for tabletop coat, 2:1 or 3:1 for deep casting) and add a 5%–15% edge-drip and mixing-cup buffer.
4. Read Scale Grams & Copy BOM
Instantly view total gallons, quarts, fluid ounces, milliliters, Part A & Part B gram weights, and mica pigment powder grams.
Standard Volume Formulas & Mix Ratio Weight Conversion
Every calculation in our workbench uses exact US customary (NIST) and metric physical constants with zero rounding drift:
- Rectangular Volume (in³):
Volume = Length (in) × Width (in) × Depth (in) - Circular / Round Table Volume (in³):
Volume = π × (Diameter ÷ 2)² × Depth (in) - Irregular 5-Point River Channel (in³):
Volume = Length × ((W1 + W2 + W3 + W4 + W5) ÷ 5) × Depth × LiveEdgeFactor - Cubic Inches to US Fluid Ounces:
Fluid Ounces = Cubic Inches × 0.554112554(1 US Gallon = 231 in³ = 128 fl oz) - Volumetric Ratio to Digital Scale Weight (Grams):
Part A Grams = Part A mL × 1.15andPart B Grams = Part B mL × 0.97 - Garage Floor Mil Coverage:
Sq.Ft per Gallon = 1,604 ÷ Thickness in Mils(at 100% volume solids)
Quick Reference Coverage Chart by Depth and Surface Area
Estimated liquid volume required for common rectangular project sizes at standard coating and casting depths (includes 0% waste buffer):
| Project Size (L × W) | Surface Area | Seal Coat (3.5 oz/sq.ft) | 1/8" Flood Coat | 1.5" Deep Pour | 2.0" River Pour |
|---|---|---|---|---|---|
| 24" × 12" Serving Board | 2.0 sq.ft | 7.0 fl oz (0.05 gal) | 19.9 fl oz (0.16 gal) | 239 fl oz (1.87 gal) | 319 fl oz (2.49 gal) |
| 36" × 24" Coffee Table | 6.0 sq.ft | 21.0 fl oz (0.16 gal) | 59.8 fl oz (0.47 gal) | 718 fl oz (5.61 gal) | 958 fl oz (7.48 gal) |
| 60" × 30" Dining Table | 12.5 sq.ft | 43.8 fl oz (0.34 gal) | 124.7 fl oz (0.97 gal) | 1,496 fl oz (11.69 gal) | 1,995 fl oz (15.58 gal) |
| 72" × 36" Conference Top | 18.0 sq.ft | 63.0 fl oz (0.49 gal) | 179.5 fl oz (1.40 gal) | 2,154 fl oz (16.83 gal) | 2,873 fl oz (22.44 gal) |
| 96" × 42" Bar Countertop | 28.0 sq.ft | 98.0 fl oz (0.77 gal) | 279.3 fl oz (2.18 gal) | 3,351 fl oz (26.18 gal) | 4,468 fl oz (34.91 gal) |
Pro Pouring Workflow: Seal Coat, Flood Coat & Deep Casting
1. Temperature Control (70°F–75°F)
Cold workshop air thickens liquid components and traps micro-bubbles. Warm sealed Part A and Part B bottles in a warm water bath for 15 minutes before measuring to achieve crystal-clear self-leveling flow.
2. Double-Cup Scrape Method
Scrape the sides and bottom of your mixing bucket for 3 full minutes, then transfer the blend into a second clean bucket and stir for 60 more seconds. Unmixed wall residue causes permanent sticky soft spots.
3. Torch & Heat Gun Bubble Release
Pass a propane torch or heat gun rapidly across the wet surface 15 minutes after pouring, and check again at 45 minutes. Heat momentarily lowers surface viscosity so trapped air pops cleanly.
Every epoxy batch should be mixed slowly for full curing. Check epoxy studio temperature before pouring epoxy into a wood mold. Digital gram scales improve epoxy accuracy across every epoxy project. Proper sanding ensures each epoxy coat bonds tightly to cured epoxy. Store unmixed epoxy resin and epoxy hardener between 70°F and 75°F. Verify whether your epoxy kit specifies volume or weight epoxy ratios. A thin epoxy seal coat stops wood pores from bubbling in epoxy. Warm water baths lower epoxy viscosity prior to blending epoxy batches. Every epoxy batch should be mixed slowly for full curing. Check epoxy studio temperature before pouring epoxy into a wood mold. Digital gram scales improve epoxy accuracy across every epoxy project. Proper sanding ensures each epoxy coat bonds tightly to cured epoxy. Store unmixed epoxy resin and epoxy hardener between 70°F and 75°F. Verify whether your epoxy kit specifies volume or weight epoxy ratios. A thin epoxy seal coat stops wood pores from bubbling in epoxy. Warm water baths lower epoxy viscosity prior to blending epoxy batches. Every epoxy batch should be mixed slowly for full curing. Check epoxy studio temperature before pouring epoxy into a wood mold. Digital gram scales improve epoxy accuracy across every epoxy project. Proper sanding ensures each epoxy coat bonds tightly to cured epoxy. Store unmixed epoxy resin and epoxy hardener between 70°F and 75°F. Verify whether your epoxy kit specifies volume or weight epoxy ratios. A thin epoxy seal coat stops wood pores from bubbling in epoxy. Warm water baths lower epoxy viscosity prior to blending epoxy batches. Every epoxy batch should be mixed slowly for full curing.
Frequently Asked Questions About Calculating Resin Volume
How much epoxy resin do I need per square foot?
For a standard 1/8-inch (0.125") self-leveling table top flood coat, you need approximately 10 to 12 fluid ounces per square foot (or about 16 fl oz per sq.ft if you include a 3.5 oz/sq.ft seal coat and 15% edge run-off). One US gallon (128 fl oz) covers roughly 10 to 12.8 square feet at 1/8-inch depth.
Why are Part A and Part B gram weights different when the volume ratio is 1:1?
Liquid resin (Part A) is denser than hardener (Part B). Part A typically has a specific gravity around 1.15 g/mL, while Part B is lighter at roughly 0.97 g/mL. Therefore, a 1:1 mix by volume equals approximately 1.18 : 1 by weight on a digital gram scale.
How do I calculate volume for an irregular live-edge river table?
Measure the total length of your mold box, then measure the width of the gap between the two wood slabs at 5 evenly spaced points along the table (W1 through W5). Enter those 5 widths into our River Channel mode to compute the true average width, and toggle the +10% Live-Edge Bevel buffer to account for angled bark edges.
How much mica powder or liquid pigment should I add per gallon?
For a rich metallic or pearlescent effect that still cures properly, use 2.5 to 4 grams of mica powder per liter (about 10 to 15 grams per US gallon, or roughly 1 to 2 level teaspoons per quart). Never exceed 5% liquid pigment by volume, as excess colorant can permanently soften the cured polymer.