Epoxy Coverage Chart — Every Thickness, Every Brand (CSV Download)

Quick answer

One gallon covers 25.7 sq ft at 1/16", 12.8 sq ft at 1/8", 6.4 sq ft at 1/4" (100% solids theory). Brands publish their own tested rates around those numbers — the chart below is the complete side-by-side: theory first, then every published rate in the library with its thickness, basis and verification status. The whole thing downloads as CSV for shopping math.

How to read the two tables

Table A (theory) is the fixed physics: thickness trades linearly against area, always. It answers "what could one gallon possibly do" and converts cleanly to m²/L for metric shopping.

Table B (published) is the reality layer: what each manufacturer actually tested and printed. Three statuses matter:

• published chart — a real coverage figure on an official page (TotalBoat's 12.8/6.4/24, Primaloc's 16/48). Use it for that product; it wins over theory.
• derived — the brand publishes a calculator formula or kit coverage instead of a chart (Stone Coat's ÷20 basis, KSResin's 0.034 oz/sq-in, Upstart's 231-in³-calibrated calculator). We converted, labeled it derived, and show the formula it came from.
• no published chart — the brand publishes nothing usable (Promise, Stone Coat Ultra Deep, KSResin Liquid Cast). Those rows say so honestly; the calculator applies the theoretical baseline to them, labeled, rather than inventing a number.

Using the chart offline

The CSV carries every row above plus source URLs — drop it into a spreadsheet, add a column for your project area, and each brand's gallons and cost compute with two formulas. That is the whole shopping workflow: gallons = area × coats × 1.10 ÷ rate, then price at the brand's kit sizes from the cost calculator. For the volume-side walk-through — how many coats, which thickness for which project — start at how much epoxy do I need, and for per-product spec sheets go to the epoxy brands library.

Why rates differ between brands

Solids content, viscosity and the film thickness the rate assumes all shift the number — a thin self-leveling flood covers more ground than a thick build coat, and a lower-solids blend leaves less film per gallon. What never changes is the physics behind them all: 231 cubic inches per gallon. Any rate that strays far from 1604 ÷ thickness at its stated film depth is marketing, not measurement — the chart makes those gaps visible instead of burying them in brochure prose.

The spread across this page is worth internalizing: West System's marine saturation coats compute to roughly 292–338 sq ft/gal (thin film on porous glass work), Primaloc's brushed seal coat publishes 48, the tabletop flood rates cluster at 12.8–20, and deep-pour casting runs 6.7 and below. That is a 40× span inside one material category — driven almost entirely by film thickness, which is why every rate on this page is pinned to its thickness or marked as untagged. When a supplier quotes you "covers about 300 square feet", the only useful follow-up question is at what thickness — the answer moves the product from the floor class to the coating class of this chart.