About EpoxyCalc

I built this calculator because I got three quotes for my garage and almost lit $5,000 on fire.

Fall 2022. My wife and I closed on a house in the Kansas City suburbs with a 2.5-car detached garage, 560 square feet of 1998-vintage concrete with oil stains the previous owner had clearly been cultivating like a hobby. We wanted epoxy. I called three local contractors and got back quotes of $2,100, $4,200, and $6,800. Same garage. Same week. I remember staring at the emails thinking one of these people is lying to me and I have no idea which one.

So I spent about 40 hours over the next two weeks reading every epoxy spec sheet, contractor blog, manufacturer PDF, and Reddit thread I could find. Turns out all three bids were "legitimate" in the sense that nobody was committing fraud. They were just pricing wildly different prep scopes and coating systems and nobody was going to volunteer that unless I asked. The $2,100 was an acid-etch job with a thin Rust-Oleum Pro coat. The $4,200 was a diamond-grind with a full flake broadcast and a 5-year warranty. The $6,800 was polyaspartic with 15 years.

I took the $4,200 bid. It's held up beautifully three winters in.

But the whole experience taught me the real problem with pricing epoxy: there is no single number, because there is no single product. It's a system, and the system's cost depends almost entirely on prep, which nobody advertises on their homepage.

What EpoxyCalc does differently

Most epoxy "calculators" online are either lead-gen forms (give us your email and ZIP and we'll send you a range) or bare-bones per-sqft multipliers that don't account for prep tier or region. EpoxyCalc asks you the questions that actually move the number: coating system, DIY or pro, slab condition (light/moderate/heavy prep), region, and optional upgrades like flake density or UV topcoat.

The output is a range, not a single scalar. Because nobody hits the point estimate. And a breakdown, so you can see how much is going to the coating versus the prep versus regional labor. When you walk into a contractor meeting with that breakdown in hand, you can spot a lowball bid in about 30 seconds.

How the formula was built

The math is grounded in published 2026 data from HomeGuide, HomeAdvisor, Angi, Bob Vila, ProjectCalcs, D and G Flooring, and Homewyse. I cross-checked per-sqft outputs against four other online calculators and the spread averages within 5 to 8 percent across coating types. Regional factors are calibrated against Bob Vila's city-level 2026 data (NYC runs about 1.27 over Dallas on the same job, our factor is 1.25 for high-cost zones).

You can see the full formula and assumptions on the guide page. I believe in showing the work, not hiding it.

Who this is for

Homeowners planning a garage, basement, or workshop epoxy floor who want to know what it should actually cost before they call contractors. If you're a commercial spec writer or a contractor pricing a 40,000 sqft warehouse, this isn't your tool, the economics are different at that scale. If you're planning to epoxy 400 to 1,200 square feet of residential concrete and want a realistic budget before you get quoted, this is for you.

What's next

I'm adding more calculators as the utility-site network grows. If there's a home improvement cost you want a transparent estimator for, drop a note on the contact page and I'll prioritize it.

About the ads

This site runs Google AdSense. The ads fund the hosting and let me keep the calculator free. If you'd like to support the site directly, sharing a link with a friend who's about to quote out their garage helps more than you'd think. Thank you.