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PAINT CALCULATOR

Epoxy floor calculator

Two-part epoxy for garage floors covers about 250 sq ft per gallon — significantly less than acrylic concrete paint. Honest take: most homeowners don't actually need epoxy. Kompozit STRONG acrylic concrete paint covers the same use case with way less hassle and roughly half the cost. We'll show you both numbers below.

HOW IT WORKS

How the epoxy math works

Epoxy coverage is driven by film thickness, not paint quality. The calculator multiplies your floor area by two coats, then divides by the coverage rate for the system you pick. Thicker, higher-solids systems cover less ground per gallon:

  • Standard 2-part epoxy: about 250 sq ft per gallon; the common water-based DIY kit at $30-50 a gallon.
  • High-build 100% solids epoxy: around 200 sq ft per gallon at typical DIY thickness, dropping toward 80 sq ft if you build it to 20 mils; $126-150 a gallon.
  • Polyurea / polyaspartic topcoat: roughly 120 sq ft per gallon; fast-curing, UV-stable clear over a base coat.
  • Moisture-seal primer: about 175 sq ft per gallon when your kit specifies a primer step.

When epoxy is worth the hassle

2-part epoxy makes sense for commercial garages, mechanic shops, or floors that take real chemical exposure (battery acid, brake fluid, hydraulic oil). The film is harder, more chemical-resistant, and will not soften under hot tires the way cheap concrete paints do. For DIY garages, basements, patios, and home workshops, acrylic concrete paint is much easier to apply (no mixing, no pot-life clock, fewer fumes), costs roughly half as much per square foot, and lasts years on a properly prepped slab.

Prep is everything

Acid etch or grind the slab. Test for moisture by taping a 2-foot plastic square down for 24 hours and checking for condensation. Vacuum, repair cracks, and let everything dry. The single biggest reason garage floor coatings fail is rushed prep, regardless of whether you used epoxy or acrylic.

What it costs to epoxy a garage floor

Material is the cheap part. Water-based epoxy runs about $30 to $50 a gallon, solvent-based $40 to $55, and 100% solids epoxy $45 to $150. A boxed DIY kit covering a 1- or 2-car garage is usually $100 to $600 depending on the system and whether it includes flake, primer, and a topcoat. Add $50 to $150 for an etch or grinder rental, rollers, and a moisture test, and a DIY 2-car floor lands around $500 to $1,000 all in.

  • DIY epoxy kit: $100 to $600 for a 1- to 2-car garage.
  • DIY total (2-car, materials + prep + supplies): about $500 to $1,000.
  • Pro-installed 2-car garage: $1,600 to $6,000; national average near $2,400.
  • Pro-installed 1-car garage: starts around $2,800 for a solid-epoxy system.

A pro charges $3 to $12 a square foot because grinding the slab and labor are most of the cost — a professional floor lasts 10 to 20 years, while a thin DIY kit on poorly prepped concrete may peel in 1 to 3. For a paint-plus-labor estimate on any surface, use thepaint cost calculator.

Frequently asked questions

How much does it cost to epoxy a garage floor?+
For a 2-car garage (about 400-450 sq ft), a DIY kit runs roughly $100 to $600 and the full job lands around $500 to $1,000 once you add primer, supplies, and a topcoat. A pro-installed epoxy floor costs about $1,600 to $6,000 — national average near $2,400 — because labor and slab grinding are most of the bill. A 1-car garage starts near $1,000 DIY or $2,800 installed.
How much epoxy do I need for a 2-car garage?+
A typical 20-by-22-foot 2-car garage is about 440 sq ft. At roughly 250 sq ft per gallon for two coats of standard water-based epoxy, plan on close to 4 gallons, plus primer if your kit calls for it.
How much does a garage floor epoxy kit cost?+
Water-based DIY epoxy runs about $30 to $50 per gallon, while 100% solids epoxy starts near $126 and can top $150 per gallon. A full DIY kit for a 2-car garage usually lands between $150 and $600 depending on the system.
What is the difference between water-based and 100% solids epoxy?+
100% solids epoxy leaves behind nearly all of what you apply, so it builds a thicker, tougher film and lasts 10 to 20 years, but it costs more and gives you very little working time. Water-based epoxy is thinner, cheaper, and far more forgiving to roll.
Is epoxy waterproof?+
The cured film resists water, but it does not stop moisture rising through the slab. Hydrostatic vapor will lift epoxy just like it lifts acrylic, so you have to confirm the slab is dry before coating.
Can I roll epoxy or do I have to spray it?+
Roll it with a 9-inch, 3/8-inch nap roller. Spraying epoxy is a pro job because the short pot life clogs tips before an amateur can manage it.
Do I really need epoxy, or is acrylic floor paint enough?+
For most home garages, acrylic concrete paint covers the same use case at roughly half the cost and far less hassle. Save epoxy for commercial floors, mechanic shops, or slabs that see real chemical exposure.
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