How Much Epoxy Do I Need? Garage Floor Coverage Guide (With Chart)
It's the first question every floor starts with, and the one that's easiest to get wrong: how much epoxy do I actually need? Order too little and you're stuck mid-pour waiting on a second shipment while your resin kicks off. Order too much and you've tied up cash in product you'll never open. This guide gives you the real math, a size-by-size chart, and the adjustments the big-box coverage numbers never mention.
The one number that matters: mils, not gallons
Epoxy coverage is really measured in mils of film thickness (one mil = 1/1000 of an inch), not in square feet per gallon. The industry rule for a 100% solids epoxy is simple:
1 gallon of 100% solids epoxy = 1,604 sq ft at 1 mil thick.
Spread that same gallon thicker and it covers less floor. So the honest answer to "how many square feet per gallon?" is always: it depends how thick you're building the floor. A skim-thin sealer coat and a heavy self-leveling base coat use wildly different amounts of the same product.
Real-world coverage for a garage floor
For a standard garage floor over properly prepared concrete, our Everflow EF-100 3-gallon kit covers roughly 350-400 sq ft in a single base coat. That's the number to plan around. Rough, porous, or freshly ground concrete drinks up more product, so lean toward the low end (350) when your slab is thirsty, and always round up to the next full kit.
Coverage chart by garage size
| Garage size | Approx. floor area | EF-100 kits (one base coat) |
|---|---|---|
| 1-car | 200-250 sq ft | 1 kit |
| 2-car | 400-500 sq ft | 2 kits |
| 2.5-car | 500-600 sq ft | 2 kits |
| 3-car | 600-750 sq ft | 2-3 kits |
Not sure of your square footage? Measure length × width in feet. A typical 2-car garage runs about 20 × 20 (400 sq ft), but many are deeper, so measure rather than assume.
Metallic and flake floors use more, and here's why
A single-color garage floor is essentially prep + one base coat + topcoat. A metallic epoxy floor is a layered system, and each layer is more product:
- Base coat: a solid pigmented coat (often white or grey) that hides the concrete.
- Metallic coat: the pigmented epoxy you actually manipulate for the marble effect, applied over the base.
- Topcoat: a clear polyaspartic or polyurethane that seals and protects the finish.
As a rule of thumb, budget roughly double the base-coat quantity for a full metallic system, plus your topcoat. For a fast single-day metallic build, many pros reach for EF-155, which is formulated for metallics and cures fast enough to recoat the same day.
Three adjustments that change your number
- Surface porosity. A ground, open-pore slab absorbs the first coat. Add 10-15% for hungry concrete.
- A second color/base coat. Coverage issues over dark or stained concrete? A second base coat doubles that layer's product.
- Waste and mixing loss. Always plan for 5-10% you'll leave in the bucket, on the roller, and in the corners.
Don't skip the prep and the topcoat
Coverage math only holds if the concrete is prepped right. An unprofiled slab wastes product and invites failure. Read how to prepare concrete for epoxy before you order, and if your slab shows any moisture, price in a moisture vapor barrier too.
Frequently asked questions
How many square feet does a gallon of epoxy cover?
A 100% solids epoxy covers about 1,604 sq ft per gallon at 1 mil thick. At a normal garage floor build, our 3-gallon EF-100 kit covers roughly 350-400 sq ft in one base coat.
Does a metallic epoxy floor use more product than a solid color?
Yes. A metallic floor is a layered system (base coat + metallic coat + clear topcoat), so plan for roughly double the base-coat quantity plus your topcoat.
Do I need a second coat of epoxy on a garage floor?
Often, yes, especially over dark, stained, or very porous concrete where one coat won't fully hide the slab. A second base coat effectively doubles that layer's product, so factor it in when ordering.
How do I calculate my garage's square footage?
Multiply length × width in feet. Measure the actual slab rather than assuming a standard size, since garage depths vary a lot.
Ready to order? Start with the EF-100 flooring kit and browse the full Latux epoxy system. Round up, prep right, and you'll never get caught short mid-pour.