How much epoxy for a 3-car garage floor?
You need 7 kits of garage floor epoxy rated at 250 square feet for two coats on a 32 × 24 ft three-car garage (768 square feet), because two coats with a 10% margin come to 1,690 square feet.
How to work it out
- 32 ft × 24 ft = 768 sq ft × 2 coats + 10% = 1,690 sq ft
- 1,690 sq ft ÷ 250 sq ft per kit = 6.76 → 7 kits
- Section per kit: 250 sq ft ÷ 1.1 = 227 sq ft
Three-car garages are commonly around 30–36 ft wide and 22–26 ft deep; 32 × 24 is a typical middle. At this size a two-coat system takes a lot of boxes, so it’s worth pricing kits against buying a coating by the gallon — see the floor coating calculator.
Adjust for your project
More options: waste · $/kit
- Floor area
- 768 sq ft
- Coverage needed (all coats + waste)
- 1,690 sq ft
- Spare coverage in the last kit
- 60.4 sq ft
- Area one kit covers per coat
- 1 kit ≈ 227 sq ft per coat — chalk-line the floor into sections this size
- Kit coverage assumes clean, properly prepared concrete. Old, porous or etched floors can drink noticeably more of the first coat.
Kits for a 24 ft deep, three-bay garage by width (two coats, 250 sq ft kits)
| Garage width | Floor area | Coverage needed (all coats + waste) | Kits to buy |
|---|---|---|---|
| 30 × 24 ft | 720 sq ft | 1,584 sq ft | 7 kits |
| 32 × 24 ft | 768 sq ft | 1,690 sq ft | 7 kits |
| 34 × 24 ft | 816 sq ft | 1,795 sq ft | 8 kits |
| 36 × 24 ft | 864 sq ft | 1,901 sq ft | 8 kits |
What to know about a 3-car garage floor
Seven kits means seven separate batches per job, and each one starts its pot life (the time the mixed coating stays usable in the bucket) the moment it’s mixed. Don’t mix the next kit until the previous one is nearly on the floor. With two people — one mixing and cutting in the edges, one rolling — a floor this size is a long but manageable day per coat.
The last kit is well used: 6.76 kits’ worth of coverage is needed, so only about 60 sq ft is left in the seventh box. Count the unopened boxes against the plan before you start the second coat, and keep them from the same batch so the color matches bay to bay.
The third bay is often a workshop or storage space with shelving along the walls. Leaving out a strip under fixed shelving can save a kit, but coat under anything you might move later — a bare stripe of concrete is obvious once the shelves come out.
By the gallon, two 10-mil coats on this floor come to roughly 11 gallons of 100%-solids coating with 15% waste; the epoxy floor coating calculator does that math for your own film thickness. Two-bay floors are covered in How much epoxy for a 24×24 garage floor, and How much epoxy for a 1-car garage floor covers a single bay.
Different size? Use the full Garage Floor Epoxy Calculator.
What you’ll need
- Garage floor epoxy kitPremium price
Boxed kits usually include the base coat and sometimes etch and flakes. Check coverage per coat and what’s actually in the box.
See options on Amazon (opens in a new tab) - Epoxy roller kit (3/8 in nap)Budget price
Shed-resistant roller covers, frame and tray. Have spare covers — a roller that starts to gel is done.
See options on Amazon (opens in a new tab) - Half-face respirator (organic vapor + particulate)Mid-range price
For fumes in poorly ventilated spaces and dust when sanding. Check the product SDS for the protection it recommends.
See options on Amazon (opens in a new tab)
As an Amazon Associate we earn from qualifying purchases. Links to products are affiliate links — they cost you nothing extra and help keep these calculators free.
Frequently asked questions
How many kits for one coat on a 3-car garage floor?
4 kits rated at 250 square feet: one coat on 768 square feet with a 10% margin needs 845 square feet.
How many 500 sq ft kits for two coats on a 32 × 24 garage?
4 kits — two coats need 1,690 square feet of coverage with the margin.
Other common sizes
Sources
- Garage Flooring LLC — Garage Floor Epoxy Coating Instructions (opens in a new tab) — Plastic-sheet moisture test, grinding or etching, light traffic after about 72 hours and about a week before parking.
- Spartan Epoxies — Purchase epoxy by layer (opens in a new tab) — Floor-coating coverage per gallon at a given mil thickness.
- Concrete Floor Supply — Epoxy flake calculator (opens in a new tab) — Full coverage: about 0.10 lb/sq ft for 1/4 in flakes, about 0.20 lb/sq ft for 1/8 in flakes.
- WALT Tools — Flake flooring (opens in a new tab) — Vinyl chips planned at about 8 sq ft per lb for a full broadcast; real-world use about 5–10 sq ft per lb depending on chip size and throwing.
- Legacy Industrial — ColorFlake decorative chips (opens in a new tab) — Chips sold in 10, 20, 30 and 40 lb quantities; custom blends in 40 lb increments.
- US EPA — Volatile Organic Compounds’ Impact on Indoor Air Quality (opens in a new tab) — Increase ventilation when using products that emit VOCs.