Epoxy Floor Calculator
Calculate epoxy floor coating coverage from floor area and coat count.
Returns kits or gallons needed for garages, basements, and commercial flooring.
Epoxy floor coating coverage depends on the product viscosity, surface porosity, and the number of coats applied. Getting the estimate right prevents costly mid-project shortages.
Gallons per coat = Floor Area (sq ft) / Coverage Rate (sq ft/gal)
Total = Gallons per coat × Number of coats × 1.10 (waste)
This calculator assumes about 250 sq ft per gallon per coat, a typical water-based epoxy rate. High-solids products cover less (160–200 sq ft/gal), so buy more if you are using them.
Typical coverage rates by product type:
| Product | Coverage per Gallon |
|---|---|
| 100% solids epoxy (1 coat) | 160–200 sq ft |
| Water-based epoxy (1 coat) | 250–400 sq ft |
| Self-leveling epoxy | 100–160 sq ft |
| Epoxy primer coat | 250–300 sq ft |
Most floors require 2 coats. Porous or previously uncoated concrete requires a primer coat first.
Worked example: A 2-car garage floor: 20 ft × 22 ft = 440 sq ft, with 2 coats plus a topcoat (3 coats):
- Per coat at 250 sq ft/gal: 440 / 250 = 1.76 gallons
- Three coats: 1.76 × 3 = 5.28 gallons
- Plus 10% for waste and roller absorption: 5.28 × 1.10 = 5.8 → 6 gallons (six 1-gallon kits)
Always buy 10–15% extra to account for waste, roller absorption, and mixing losses.
Surface prep factor: Raw or porous concrete absorbs significantly more product on the first coat. Reduce coverage expectations by 20–30% for uncoated concrete.
Temperature requirements:
- Ideal application: 60–85°F (15–29°C)
- Below 50°F: epoxy cures too slowly and may not harden properly
- Above 90°F: pot life shortens dramatically; work in small sections
How we build and check this calculator
This calculator runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
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