Deep Pour Epoxy Resin Calculator
Our deep pour epoxy resin calculator determines the exact liquid volume, mix splits, and safety buffer needed for river tables, deep silicone molds, and thick timber slab castings without short-pour seams or costly waste.
How to Calculate Epoxy Resin for a Table
A deep pour epoxy resin calculator converts outer mold dimensions (length × width × depth) into liquid volume in cubic inches, fluid ounces, or gallons. It subtracts wood displacement, applies 2:1 or 1:1 resin-to-hardener ratios, and adds a safety margin for mixing loss.
Standard tabletop resins overheat if poured thicker than 1/4 inch. In contrast, deep pour formulas feature a slow working time and low exothermic heat, allowing single-lift pours from 1.5 to 4 inches. Understanding your deep pour epoxy coverage per inch depth keeps projects clear, bubble-free, and on budget.
The Mathematical Formulas Used
Rectangular Mold & River Form Formula
Gross Volume (in³) = Length × Width × Pour DepthNet Volume (in³) = Gross Volume × (1 - (Wood Displacement % / 100)) × 1.05Circular / Round Mold Formula
Volume (in³) = π × (Diameter / 2)² × Pour DepthStandard Volumetric Conversion Constants:
- 1 US Fluid Ounce = 1.80469 cubic inches ($in^3$)
- 1 US Liquid Gallon = 231 cubic inches = 128 fl oz
- 1 Liter = 61.0237 cubic inches = 33.814 fl oz
Worked Example: 60″ × 30″ River Table (2″ Deep)
If your mold is 60″ long, 30″ wide, 2″ deep, and your wood slabs displace 60% of the space:
- Gross Mold Volume: 60 × 30 × 2 = 3,600 in³
- Net Resin Area (40% Open): 3,600 × 0.40 = 1,440 in³
- Add 5% Waste/Buffer: 1,440 × 1.05 = 1,512 in³
- Gallons Needed: 1,512 ÷ 231 = 6.55 Gallons (838 fl oz)
How Much Deep Pour Epoxy Do I Need for a River Table?
To answer how much epoxy resin for your river table is needed, account for wood-to-epoxy volume displacement. Live edge timber slabs occupy a significant portion of the form. Use these baseline displacement ranges:
Narrow Canyon (25-35% Resin)
Wide slabs taking up 65-75% of mold volume. Best for tight accent veins.
Classic River (45-55% Resin)
Balanced 50/50 split between bookmatched live edge slabs and casting resin.
Ocean / Island Form (70%+ Resin)
Small wood burls or island clusters floating in a wide colored epoxy field.
Deep Pour Epoxy Resin to Hardener Ratio Calculator
Epoxy formulations rely on balanced chemical reactions. Using an accurate ratio tool prevents sticky surfaces and incomplete curing:
- 2:1 Mix Ratio: Standard for deep pour casting (2 to 4 inches thick). Consists of 66.7% Part A Resin and 33.3% Part B Hardener by volume. Allows natural bubble release and low shrinkage.
- 1:1 Mix Ratio: Standard for surface coatings, skim coats, and rapid adhesives. High exothermic heat restricts this formulation to 1/8 to 1/4 inch layers.
- How Many Layers for 2 Inches: With dedicated deep casting resin, pour all 2 inches in 1 single layer. Standard tabletop resin would require 8 to 16 separate thin coats.
- 5% Safety Buffer: Accounts for cup clinging, wood grain absorption, and mold leveling discrepancies.
Frequently Asked Questions
How thick can you pour deep pour epoxy in one layer?
Most commercial deep pour epoxy formulas allow a single-pour thickness between 2 to 4 inches. Formulations with slow exothermic heat release prevent thermal runaway, yellowing, and cracking during thick single-stage pours.
How long does deep pour epoxy take to cure?
Deep pour casting resin typically has an extended pot life of 3 to 6 hours, reaches an initial gel state in 24 to 36 hours, and cures hard for demolding and machining in 48 to 72 hours at 72°F (22°C).
Can you pour deep pour epoxy 2 inches thick at once?
Yes. Deep pour epoxy is specifically designed for 2-inch single pours because its slow-reacting hardener controls heat buildup. Tabletop epoxy cannot do this and would boil if poured 2 inches deep.
How do you calculate epoxy resin for a table?
Multiply mold Length × Width × Pour Depth in inches to find total cubic inches. Subtract the wood slab displacement percentage, divide by 231 to get total gallons (or by 1.805 for fluid ounces), and add a 5% to 10% safety buffer.
What's the maximum depth for a single deep pour epoxy pour?
The maximum recommended single-pour depth is 4 inches for low-mass castings and 2 to 3 inches for larger river table volumes to maintain safe exothermic temperature levels.
Why is my deep pour epoxy cloudy or not curing?
Cloudiness and failed cures happen due to improper 2:1 or 1:1 mix ratios, unmixed resin scraped from bucket walls, workshop temperatures under 65°F (18°C), or moisture contamination in the wood slab.
Epoxy Resin Calculator
Total Resin Required (5% Buffer Included)
≈ 586.5 fl oz (17.34 Liters)
* Estimated epoxy volume includes the selected safety margin. Actual resin consumption may vary based on wood porosity, live-edge voids, sealing coats, and container mixing loss.
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