Concrete & garage floor calculator
Floor coatings cover less per gallon than wall paint — concrete is porous and the formulations are thicker. Pick your coating type and slab dimensions below. Concrete floor paint runs about $15 to $30 a gallon, so a DIY 2-car garage stays under a few hundred dollars in materials.
Coverage drops on concrete
Bare concrete is porous and absorbs the first coat unevenly. Plan for ~225 sq ft/gal with a proper concrete paint like Kompozit STRONG. Granite-grip and similar anti-slip textured coatings cover even less (75 sq ft/gal) because the formulation includes aggregate that builds the slip-resistant surface.
Prep matters more than the paint
On previously sealed concrete, etch with muriatic acid or use a TSP substitute and rough up the surface. On bare slabs cured 28+ days, sweep clean and pressure-wash. Any oil stain has to come off first — paint won't bond through oil.
Coating types and how much they cover
The calculator picks a coverage rate from the coating you choose, then multiplies by your slab area and number of coats. The big swing is the product type, not the brand:
- Garage / driveway / patio paint: about 225 sq ft per gallon on bare concrete; an acrylic floor paint that holds up to foot and vehicle traffic.
- Porch & patio floor paint: around 350 sq ft per gallon; thinner film for light-duty walking surfaces.
- Concrete dye / stain: roughly 250-300 sq ft per gallon; colors the slab rather than coating it.
- Granite-grip / anti-slip textured: as low as 75 sq ft per gallon because the aggregate that builds the non-slip surface uses up a lot of material.
Two coats, always
Even concrete paints rated as one-coat want two for hot-tire pickup resistance and uniform appearance. The first coat soaks in unevenly; the second is what you actually see and walk on. Hot-tire pickup is the classic failure mode: tires warmed on summer asphalt soften thin or poorly cured paint and peel it up when you park. A properly etched slab plus two coats is the fix.
What it costs to coat a garage floor
Plain acrylic concrete floor paint is the budget option at about $15 to $30 a gallon. A 2-car garage of roughly 440 sq ft needs about 4 to 5 gallons for two coats, so paint plus rollers, an etch kit, and a moisture test usually runs $100 to $300 done yourself. Granite-grip and other anti-slip textured products cost more per gallon and cover far less, which pushes a textured floor toward the high end.
- Concrete floor paint: $15 to $30 a gallon.
- DIY 2-car garage (paint + prep + supplies): about $100 to $300.
- DIY epoxy kit upgrade: $100 to $600.
- Pro-installed coating, 2-car garage: $1,600 to $4,300; national average near $2,400.
Acrylic paint is the cheapest path and works fine on a properly etched home garage. Paying a pro mostly buys slab grinding and labor, not better paint. For a paint-plus-labor estimate on any project, use thepaint cost calculator.