Epoxy Resin for River Tables:
Deep Pour Math & Setup
Published on March 22, 2026 • By the MakerRatio Woodworking Team
Interactive River Table Estimator
Calculate the exact gallons or quarts of deep-pour resin required by averaging the channel width. Excludes wood area to prevent over-buying.
Building a live-edge river table is a high-cost, high-reward woodworking craft. Deep pour epoxy resin can cost upwards of \$80 to \$120 per gallon, and large dining room tables can require anywhere from 5 to 20 gallons of resin. A simple mathematical miscalculation can lead to under-ordering materials or causing a thermal runaway event.
The Average Width Formula
Because live-edge wood slabs have natural curves, the width of the river channel changes constantly. To find the true volume, you must average the width:
- Measure the width of the river channel at regular 6-inch intervals along the entire length of the table.
- Add all the measurements together.
- Divide the sum by the number of measurements taken to find the average width.
Volume (Cubic Inches) = Length (in) × Average Width (in) × Depth (in)
To convert cubic inches directly into US Gallons, divide the final cubic inch total by **231**:
Gallons Required = (Cubic Inches / 231) × 1.10 (Waste Buffer)
Crucial Chemistry: Deep Pour vs. Coating Epoxy
Never use standard tabletop epoxy (1:1 ratio) to pour a thick river table channel. Tabletop epoxy cures quickly and releases intense heat. In pours deeper than 1/4 inch, this heat accumulates, leading to a thermal runaway reaction: the resin will boil, yellow, smoke, crack, and shrink away from the wood.
Always purchase deep-pour resin (2:1 or 3:1 mixing ratios) that cures slowly over 48 to 72 hours, allowing the heat to dissipate safely.