About Epoxy Coverage Calculator — Neutral Coverage Math
Who runs Epoxy Coverage Calculator, why it is brand-neutral, where every coverage rate and price comes from, and how the 1604-rule baseline and published brand rates coexist.
Why this site exists
Epoxy shopping has a coverage problem: every brand's own calculator runs the math toward its own product line, so one brand's "you'll need 3 gallons" isn't comparable to another's — and most brand calculators stop at a product page. This site is deliberately brand-neutral: one published formula (the coatings industry's 1604 rule), every brand's published rate quoted next to it with a source, and the work shown so you can compare on data, not marketing.
How the numbers are produced
- One formula, one source of truth. The coverage math (thickness ⇄ area, the 231 in³/gal volume math, mix-ratio splits, kit rounding and the 1.10 waste allowance) lives in a single module of this site's code. The calculators, the homepage quick table, the coverage chart, its CSV download and the machine-readable summary for AI tools are all generated from that one module — there is no second place where the math could drift.
- Every brand figure has a source and a date. Coverage rates, mix ratios, thickness caps, recoat windows and prices were captured from official product pages, TDS documents and help centers (2026-11-06/07), each carrying a Last Verified date and a dual/single/derived mark. Where the same value appears on two official pages, it says so.
- Honest uncertainty. Where a brand publishes nothing — Promise's coverage sections defer to their JS calculator, for example — the pages say so and apply the labeled theoretical baseline instead of inventing a number. Conflicts (a page-tag price versus a checkout price) are recorded as conflicts, not quietly resolved.
What this site is not
Not affiliated with, endorsed by, or sponsored by any epoxy manufacturer. Calculator results are planning estimates for information only — real pours depend on your surface, your temperature and your discipline, and the manufacturer datasheet for the exact product you buy always wins. Epoxy work also has safety basics (ventilation, PPE, skin protection) that no calculator covers; the disclaimer spells out the limits.
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