THE BASICS
1. Epoxy comes in kits, not paint cans
A garage floor kit bundles resin, hardener and often a decorative chip pack. The key figure printed on the box is total coverage for the full system — usually one coat over the stated area. Buying by that number, not by paint-gallon intuition, is the whole trick.
FIGURES
2. Coverage per gallon of epoxy
Most 100%-solids or water-based epoxy floor products cover roughly 250–350 sq ft per gallon per coat at typical film builds. Manufacturer sheets vary with solids content, so the printed figure on your kit always wins — treat these ranges as a sanity check, not a spec.
| Floor area | One coat | Two coats |
|---|---|---|
| 1-car garage (~250 sq ft) | 1 × 1-car kit | 2 kits or 1 large kit |
| 2-car garage (~400–500 sq ft) | 1 × 2-car kit | 2 × 2-car kits |
| 3-car garage (~600–750 sq ft) | 2 × 2-car kits | 3–4 × 2-car kits |
Ranges reflect common retail kits; always size with the printed coverage of your specific product.
MEASURING
3. Measuring the floor honestly
Measure length × width and subtract nothing for the workbench you will move anyway — but do subtract built-ins you will paint around. A standard two-car garage bay is about 20×20 ft: 400 sq ft per bay, 380 after the odd pillar.
Concrete that has never been sealed drinks more: on a bare, porous slab budget the low end of the coverage range for the first coat.
SYSTEM
4. One coat or two
One full-system coat hides well; two thin coats last longer and even out pinholes. If you plan two coats, buy the kit size for double your area — most garages need a 2-car kit for one coat, or two kits for a durable two-coat build.
Ready to skip the math?
Open the paint calculator