Resin Calc

Epoxy Garage Floor Cost Calculator

Enter your garage size and coating to see how many gallons of epoxy to buy, what it costs to do yourself, and what a professional typically charges.

Garage floor estimate

Garage size
ft
ft
Coating
$

Flakes, crack repair, grinder or tool rental. Anything not covered above.

Professional finish

Your estimate

Do it yourself

$272–$841

$0.76–$2.33 per sq ft

Hire a professional

$1,080–$4,320

$3.00–$12.00 per sq ft

DIY saves about $2,144 at mid-range prices

Epoxy to buy

4.94gal

Floor area

360sq ft

Coverage: 160.4 sq ft per gallon per coat

DIY breakdown

Epoxy$222–$741
Prep supplies$50–$100

DIY covers epoxy and basic prep supplies. Add a topcoat, flakes and tool rental above to compare like for like with a professional quote, which includes all of them plus labor.

How to estimate what an epoxy garage floor costs

The cost comes down to how much floor you have, which coating you choose, and whether you do the work. This calculator follows the same steps a contractor would, using published US price ranges.

  1. 1

    Measure the floor

    Multiply length by width in feet. Typical footprints are about 12 × 20 ft for a 1-car garage, 18 × 20 ft for a 2-car and 32 × 22 ft for a 3-car, according to Angi. Measure your own: the cost scales directly with the area.

  2. 2

    Choose the coating

    Water-based kits are the cheapest at about $30–$50 a gallon. 100% solids epoxy builds a thicker, tougher film and costs about $45–$150 a gallon (This Old House). It is also harder to apply, which is why many professionals use it and many DIY kits do not.

  3. 3

    Work out the gallons

    A US gallon is 231 cubic inches, so spread 1 mil thick it covers 1,604 sq ft. Divide that by your thickness in mils for the coverage per gallon: about 160 sq ft at 10 mils. Multiply by the number of coats and add 10–15% for porous concrete and what stays in the bucket.

  4. 4

    Add prep and finish

    Budget about $50–$100 for cleaning and etching supplies, $25–$250 to patch cracks, and $0.85–$1.15 per sq ft for an acrylic topcoat (This Old House). Prep decides how long the floor lasts more than anything else.

  5. 5

    Compare a professional quote

    Installed epoxy typically runs $3–$12 per sq ft, materials and labor included, and $5–$12 for metallic finishes (This Old House, Inch Calculator). A quote at the low end usually means minimal prep; ask what it includes.

Epoxy garage floor cost by garage size

Worked out with this calculator at two coats and 10% extra. DIY runs from a water-based kit at its lowest price to 100% solids at its highest, epoxy and prep supplies only. Pro is $3–$12 per sq ft.

GarageEstimated cost
1-car (12 × 20 ft, 240 sq ft)DIY $119–$594 · Pro $720–$2,880
2-car (18 × 20 ft, 360 sq ft)DIY $154–$841 · Pro $1,080–$4,320
3-car (32 × 22 ft, 704 sq ft)DIY $253–$1,548 · Pro $2,112–$8,448

DIY figures leave out topcoat, flakes and tool rental. Broader DIY estimates, such as This Old House’s $2–$5 per sq ft, include them.

What changes the price

The state of the concrete

Oil stains, cracks, old sealers and moisture all need dealing with before epoxy will stick. Grinding or acid etching, crack repair and degreasing are where cheap jobs cut corners, and where peeling floors come from.

The coating system

A one-coat water-based kit and a multi-coat 100% solids system with a topcoat are different products at different prices. Thicker systems use more material per square foot and cost more to install.

Decorative finishes

Flake broadcasts add material and labor, and metallic floors are priced higher again, at about $5–$12 per sq ft installed.

Where you live

Labor makes up much of a professional price, so local rates matter. National averages put a typical job at about $2,400–$2,500 (Angi, HomeAdvisor); get two or three local quotes that list prep, coats and topcoat separately.

Epoxy garage floor cost questions

How much does it cost to epoxy a 2-car garage floor?

For a typical 2-car garage of about 360 sq ft, a professional job runs about $1,080–$4,320 at $3–$12 per sq ft. National averages from Angi and HomeAdvisor put a typical project at about $2,430–$2,520. Doing it yourself, the epoxy and prep supplies come to about $154–$841 before a topcoat and extras.

How much epoxy do I need for a garage floor?

Divide 1,604 by the film thickness in mils to get square feet per gallon, then multiply out by your area and coats. A 360 sq ft 2-car garage needs about 4.9 gallons of 100% solids epoxy at 10 mils for two coats with 10% extra, or about 3.5 gallons of a water-based kit. For metric units or kilograms, use the epoxy coverage calculator.

Is it cheaper to epoxy a garage floor yourself?

Usually, by a wide margin, because labor is most of a professional price. The catch is preparation: a floor that is not properly cleaned and profiled can peel within a year, and fixing that costs more than doing it right. Broader DIY estimates of $2–$5 per sq ft (This Old House) include the topcoat, flakes and tools this calculator lists separately.

Should I use a water-based kit or 100% solids epoxy?

Water-based kits are cheaper and easier to apply, but need recoating every few years. 100% solids epoxy goes on thicker and lasts longer but sets faster and is harder to work, which is why it may call for a professional installer (This Old House).

How many coats of epoxy does a garage floor need?

Most systems use a base coat and a second coat or clear topcoat. This calculator defaults to two coats of epoxy, which errs on the side of buying enough. Your product’s instructions give the exact number and thickness.