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PaintingGarage Floor Epoxy Calculator — How Many Kits Do I Need?
Enter your garage floor’s length and width and the number of coats to estimate epoxy kits, based on about 250 sq ft of coverage per kit. Bare or porous concrete drinks up more.
How this calculator works
We multiply length × width by the number of coats and divide by about 250 sq ft per kit — typical for a single-car garage kit. Coverage varies by brand and how thirsty the concrete is, so check the label.
What changes how much you need
- A typical kit covers about 250 sq ft (1-car); larger 2.5-car kits cover ~500 sq ft.
- Bare, porous, or etched concrete soaks up the first coat — buy extra.
- A second coat or a clear topcoat adds durability but needs more product.
- Etch or grind and fully clean the floor first, or the epoxy won’t bond.
Frequently asked questions
How much epoxy for a 2-car garage?
A standard 20×20 ft (400 sq ft) two-car garage needs about 2 single-car kits, or one 2.5-car kit, for a single coat. Enter your size above for the exact count.
How much does a garage floor epoxy kit cover?
About 250 sq ft for a 1-car kit and roughly 500 sq ft for a 2.5-car kit, though bare concrete reduces coverage.
Do I need two coats of epoxy?
One coat works for light use; a second coat or a clear topcoat greatly improves durability and gloss for daily-driver garages.