Epoxy Resin Calculator: How Much Epoxy Do I Need?
Epoxy resin calculator for tabletops, river tables, and molds. Converts inches to ounces (divide by 1.805), splits resin and hardener, adds 10% waste.
Epoxy punishes bad estimates in both directions: mix too little and the rescue batch you scramble together rarely levels or color-matches the half-cured first pour; mix too much and you’re pouring out resin that costs $60–$120 per gallon kit in 2026. The calculator above solves this in three modes. Flat surface mode takes length × width in inches plus a coat depth, with presets for a 1/16-inch seal coat and 1/8–1/4-inch flood coats. River table mode uses the river’s length, average width, and pour depth. Cylinder mode covers round molds by diameter and height. Every mode converts cubic inches to US fluid ounces by dividing by 1.805, shows milliliters alongside, splits the total into resin and hardener at a 1:1 or 2:1 volume ratio, adds an adjustable 10% waste allowance, and prices the pour from your cost per gallon.
How much epoxy do I need?
Multiply length × width × depth of the pour in inches to get cubic inches, divide by 1.805 to convert to US fluid ounces, then add 10 percent for waste. A 24 × 12-inch board at a 1/8-inch flood coat is 36 cubic inches ÷ 1.805 = 20 ounces, about 22 with waste. The calculator above runs this for flat coats, river tables, and cylinder molds, and splits the result into resin and hardener parts.
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Epoxy Resin Calculator
Key Information
| Parameter | Details |
|---|---|
| Cubic inches per US fluid ounce | 1.805 |
| Flood-coat coverage per gallon at 1/8 inch | ~12 sq ft |
| Deep-pour resin max depth per layer | 2–4 inches |
| 2026 epoxy price per 1-gallon kit | $60–$120 |
Frequently Asked Questions
How much epoxy do I need?
Multiply length × width × depth of the pour in inches to get cubic inches, divide by 1.805 to convert to US fluid ounces, then add 10 percent for waste. A 24 × 12-inch board at a 1/8-inch flood coat is 36 cubic inches ÷ 1.805 = 20 ounces, about 22 with waste. The calculator above runs this for flat coats, river tables, and cylinder molds, and splits the result into resin and hardener parts.
How many square feet does a gallon of epoxy cover?
About 12 square feet at a standard 1/8-inch flood coat — a US gallon is 231 cubic inches, so pure geometry gives 12.8 square feet and manufacturers round down for edge loss. The same gallon covers roughly 25 square feet as a 1/16-inch seal coat, but only 1.6 square feet poured 1 inch deep. Bare, porous wood absorbs resin and can cut seal-coat coverage by 20 to 30 percent.
Can I use tabletop epoxy for a deep river-table pour?
Not in one pour. Tabletop epoxy is limited to about 1/8 to 1/4 inch per layer; poured 1.5 inches deep, it traps its own exotherm heat and can crack, yellow, or shrink as it cures. Deep-pour casting resin accepts 2 to 4 inches in a single layer. If tabletop epoxy is all you have, build depth in 1/4-inch layers at least 3 hours apart — the calculator’s total ounces stay the same.
Are these calculators free to use?
Yes, all calculators on CalcCorp are completely free — no registration, no login, no hidden charges. Results are calculated instantly in your browser and we do not store any of your data.
How accurate are these calculations?
Our calculators use standard financial formulas updated with the latest tax rates, interest rates, and government policies for 2026. Results are accurate for planning purposes but should be verified with a professional for final decisions.
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Last updated: March 2026