Epoxy floor calculator: how many epoxy kits do I need for my garage floor?
1 × 2.5 Car Kit
2 pouches of EpoxyShield at 250 sq ft each for 400 sq ft, one coat · for a 20 × 20 ft floor
Run your own numbers
Enter it the way you measured it: 4.5, 4 1/2,
3/8 or 10' 6".
1 × 2.5 Car Kit
2 pouches of EpoxyShield at 250 sq ft each for 400 sq ft, one coat
Source: Rust-Oleum EpoxyShield Water-Based technical data sheet ESH-39 and RockSolid technical data sheet RSD-10, read October 26, 2026. Data sheet (PDF)
A 20 × 20 ft garage floor, 400 sq ft, takes 1 × 2.5 Car Kit of Rust-Oleum EpoxyShield: two pouches at about 250 sq ft each in one coat, the coverage its data sheet gives with 15% loss counted.
A worked example
A 23 by 13 1/2 ft one-car garage and workshop in RockSolid with a clear topcoat over it needs 2 pouches of RockSolid and 1 clear coat kit. 310.5 sq ft at 200 sq ft per pouch is 1.55, so 2 pouches; at 250 it would still be 2. The clear coat covers 500 sq ft over a coated floor: one kit.
How many square feet does a garage floor epoxy kit cover?
An EpoxyShield Water-Based pouch covers about 250 sq ft with 15% loss counted, and the 2.5 Car Kit holds two, labeled 450 to 500 sq ft. A RockSolid Polycuramine pouch covers 200 to 250 sq ft. EpoxyShield Clear covers 500 sq ft over a coated floor and 250 over bare concrete.
Does a garage floor need two coats of epoxy?
Not with these two: EpoxyShield's data sheet says only one coat is necessary under most circumstances, and RockSolid is sold as a one coat system. A clear topcoat is a separate kit, counted at 500 sq ft over the color.
What else it is called
Also searched as an epoxy floor coating calculator, garage floor epoxy calculator or epoxy floor coverage calculator. The kits carry their own etch and decorative chips, so the chips are not counted apart.
Kits by garage size
| Floor | Sq ft | EpoxyShield pouches (kits) | RockSolid pouches | Clear coat kits over the color |
|---|---|---|---|---|
| 12 × 20 ft | 240 | 1 (1 × 1 car) | 1-2 | 1 |
| 12 × 24 ft | 288 | 2 (1 × 2.5 car) | 2 | 1 |
| 20 × 20 ft | 400 | 2 (1 × 2.5 car) | 2 | 1 |
| 22 × 22 ft | 484 | 2 (1 × 2.5 car) | 2-3 | 1 |
| 24 × 24 ft | 576 | 3 (1 × 2.5 car + 1 × 1 car) | 3 | 2 |
| 30 × 24 ft | 720 | 3 (1 × 2.5 car + 1 × 1 car) | 3-4 | 2 |
| 36 × 24 ft | 864 | 4 (2 × 2.5 car) | 4-5 | 2 |
One coat. EpoxyShield Water-Based at about 250 sq ft per pouch, 15% loss included (TDS ESH-39), two pouches to the 2.5 Car Kit; RockSolid Polycuramine at 200 to 250 sq ft per pouch (TDS RSD-10); EpoxyShield Clear at 500 sq ft per kit over a coated floor.
Where the numbers come from
- EpoxyShield Water-Based Epoxy Garage Floor Coating, Rust-Oleum technical data ESH-39 (Rev. 072121): practical coverage «Approximately 250 sq. ft. … per pouch» at the recommended film thickness, assuming 15% material loss; «2.5 Car Kit contains two burst pouches»; «Only one coat is necessary under most circumstances». The 2.5 Car Kit label: covers up to 450-500 sq ft. Read October 26, 2026. EpoxyShield data sheet ESH-39 (PDF)
- RockSolid Polycuramine Garage Floor Coating Kit, Rust-Oleum technical data RSD-10 (Rev. 031417): «Each Polycuramine pouch covers up to 200-250 square feet», a one coat system. RockSolid data sheet RSD-10 (PDF)
- Clear topcoat: Rust-Oleum EpoxyShield garage floor sell sheet, Clear Finish Floor Coating, «Covers up to 500 Sq. Ft. over coated concrete; Covers up to 250 Sq. Ft. over bare concrete». EpoxyShield sell sheet (PDF)
- The rest is arithmetic: pouches = floor sq ft × coats ÷ coverage, rounded up; EpoxyShield pouches in pairs to 2.5 Car Kits and an odd one to a 1 Car Kit.
The coverage is for clean, etched concrete in sound condition, as both kits direct. RockSolid's sheet says rough or porous concrete takes more, which is why the count uses the low end, 200 sq ft per pouch.
By Javier Miralles · Last updated . How this site is made.
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