How Much Epoxy Do I Need? Coverage Guide for Garage and Concrete Floors
Figuring out how much epoxy to buy comes down to three things: the size of your floor, how thick you plan to pour, and whether you are running a full system with a primer and a topcoat. This guide walks through the math the way a floor contractor does it, using coverage figures straight from Latux Technical Data Sheets.
The short answer
Measure your floor in square feet, then match it to the coverage of the system you want. As a starting point:
- A solid-color garage floor at a standard build covers about 300 square feet per 3-gallon kit.
- A metallic floor, poured thicker for depth, covers about 160 square feet per 4-gallon kit.
- A full broadcast flake floor covers about 400 square feet on a 3-gallon epoxy base with 25 lb of flakes.
Always round up and add a cushion for waste. Running short in the middle of a pour is the one mistake you cannot fix cleanly.
Step 1: Measure your floor
Multiply length by width to get square feet. For odd shapes, break the floor into rectangles and add them together. Here are common garage sizes to size against:
| Garage | Typical dimensions | Square feet |
|---|---|---|
| 1 car | 12 x 20 ft | about 240 |
| 2 car | 20 x 20 to 24 x 24 ft | about 400 to 576 |
| 3 car | 30 x 22 ft | about 660 |
Measure your own slab. Builder "2-car" sizes vary, and a 40 square-foot difference can be a whole extra kit.
Step 2: Coverage and mils, explained
Epoxy coverage is driven by thickness, measured in mils. One mil is one thousandth of an inch. A 100% solids epoxy covers about 1,604 square feet per gallon at 1 mil. Floors go on much thicker than that, so the real coverage per gallon is far smaller.
The formula contractors use:
Coverage per kit (sq ft) = kit gallons x 1,604 divided by mils
Pour thicker and each kit covers less floor. Pour thinner and it covers more, but you give up depth and durability. That trade-off is why a metallic art pour uses several times more material than a thin garage coat.
Coverage by Latux system
These figures come from the product Technical Data Sheets at their standard build thickness.
| System | Kit | Standard build | Coverage per kit |
|---|---|---|---|
| Solid color / garage (EF-100, EF-150, EF-155) | 3 gal | 16 mils | about 300 sq ft |
| Metallic (EF-Masterflow) | 4 gal | 40 mils | about 160 sq ft |
| Full broadcast flake floor (EF-100 base plus floor flakes) | 3 gal + 25 lb | full broadcast | about 400 sq ft |
| Moisture vapor barrier (EF-160) | 3 gal | about 18 mils | about 264 sq ft |
| Polyaspartic topcoat (EF-290) | 2 gal | 8 mils | about 400 sq ft |
| Polyurethane topcoat (EF-301) | 1 gal | 5 mils | about 400 sq ft |
The EF-100 data sheet lists a thickness range: 600 to 800 square feet per kit as a thin primer coat at 6 to 8 mils, and 200 to 400 square feet as a wear coat at 12 to 24 mils. The 300 figure above is a middle garage build.
Step 3: Worked garage examples
Base coat only, before primer and topcoat:
| Floor | Solid color at 16 mils | Metallic at 40 mils |
|---|---|---|
| 1 car, about 250 sq ft | 1 kit | 2 kits |
| 2 car, about 500 sq ft | 2 kits | 4 kits |
| 3 car, about 700 sq ft | 3 kits | 5 kits |
These are base-coat counts. A finished floor usually adds a primer or moisture barrier underneath and a topcoat on top, each with its own coverage.
Add for waste and rough concrete
Keep a 10% waste cushion on a smooth, sound slab, and 15 to 20% on rough or freshly ground concrete. A porous or heavily profiled surface drinks up extra material on the first coat, so add it to the base or primer, not the topcoat.
Do not forget primer and topcoat
A durable floor is a system, not a single bucket:
- Primer or moisture vapor barrier on bare or damp concrete, for adhesion and moisture control.
- Base coat in your color or metallic finish.
- Topcoat, polyaspartic or polyurethane, for UV stability, gloss, and abrasion resistance.
Size each layer on its own coverage. They do not share the same number.
Get an exact takeoff
The table method gets you close. For a precise kit-by-kit list that accounts for film build, surface profile, color, and topcoat, Latux Pro members can log in and use the interactive Coverage Calculator in the dashboard.
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Frequently asked questions
How much epoxy do I need for a 2-car garage?
A typical 2-car garage runs 400 to 500 square feet. For a solid-color floor at a standard 16 mil build, plan on about 2 base kits plus a topcoat. For a metallic floor at 40 mils, plan on 4 EF-Masterflow kits. Measure your slab and round up.
How many square feet does a gallon of epoxy cover?
A 100% solids epoxy covers about 1,604 square feet per gallon at 1 mil. Real floors go on much thicker, so a gallon covers far less. At a 16 mil garage build, a gallon covers roughly 100 square feet.
How thick should an epoxy floor be?
Garage and solid-color floors are usually 12 to 24 mils. Metallic floors are poured thicker, around 32 to 50 mils, for depth and a poured-glass look. Thicker builds cover less area per kit.
Do I need a primer or moisture barrier?
On bare or high-moisture concrete, yes. A primer or moisture vapor barrier improves adhesion and blocks slab moisture that can lift a coating later. Size it as its own layer with its own coverage.
Does rough concrete use more material?
Yes. Freshly ground or porous concrete absorbs more on the first coat. Add material to the base or primer on a rough profile, and keep a 10% waste cushion, 15 to 20% on rough slabs.
Why does a metallic floor cover less than a solid color?
Metallic floors are poured thicker for depth, so each kit covers less floor. A 4-gallon EF-Masterflow kit covers about 160 square feet at 40 mils, compared with about 300 square feet for a standard solid garage build.