Epoxy Floor Calculator
Calculate how much epoxy primer, base coat, and top coat you need for any floor size. Get gallon counts, flake quantities, and a full material cost estimate.
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ft
Floor Area
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Primer (250 sq ft/gal) —
Base Coat (200 sq ft/gal) —
Top Coat (300 sq ft/gal) —
Extended More scenarios, charts & detailed breakdown ▾
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ft
Area
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Primer Gallons —
Base Coat Gallons —
Top Coat Gallons —
Professional Full parameters & maximum detail ▾
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ft
sq ft/gal
gal/100sqft
in
oz/gal
hrs
$
$
Total Area
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Acid Etch Gallons —
Self-Leveling Compound Bags (50 lb) —
Base Coat Gallons (all coats) —
Top Coat Gallons —
Anti-Slip Additive (oz) —
Total Dry Time Between Coats —
Total Project Cost —
Cost per Sq Ft —
How to Use This Calculator
- Enter your floor length and width in feet.
- Results show primer, base coat, and top coat gallons instantly.
- Use the Decorative tab to add metallic/flake quantities.
- Use the Cost Estimate tab to input your product prices per gallon.
- Switch to Professional for acid etch, self-leveling compound, anti-slip additive, and full project cost.
Formula
Primer gallons = Area ÷ 250 • Base coat = Area ÷ coverage rate × coats • Top coat = Area ÷ 300
Flake (lbs) = Area × broadcast rate (oz/sq ft) ÷ 16
Example
20 × 20 ft garage (400 sq ft): Primer = 1.6 gal, Base coat = 2.0 gal (2 coats at 200 sq ft/gal each), Top coat = 1.3 gal. At $45/$65/$75 per gallon: material cost ≈ $290.
Frequently Asked Questions
- A typical 2-car garage (20 × 20 ft = 400 sq ft) needs about 1.6 gallons of primer (at 250 sq ft/gal), 2 gallons of base coat (at 200 sq ft/gal), and 1.3 gallons of top coat (at 300 sq ft/gal).
- Yes — for most bare concrete floors, acid etching (or mechanical grinding) opens the pores so epoxy adheres properly. Use approximately 0.5 gallons of etching solution per 100 sq ft.
- Most residential floors need 2 coats of base coat plus a clear top coat. High-traffic commercial floors benefit from 3 base coats.
- Coverage varies by product viscosity. Typical ranges: primer 250–300 sq ft/gal, base coat 150–250 sq ft/gal, clear top coat 250–350 sq ft/gal. Always check your product label.
- Most water-based epoxies require 12–24 hours between coats at 70°F. Solvent-based products may need 24–48 hours. Temperature and humidity affect dry time significantly.