How many gallons of epoxy do I need for a 2-car garage?

Construction & MaterialsPolymer Coating Sizing

Epoxy Resin & Hardener Calculator

Calculate exact Part A resin and Part B hardener volumes for garage floor coatings, countertops, and deep-pour epoxy river tables.

Construction & Materials Field StandardsPolymer Coating Sizing

Engineering formulations calibrated to IPC, UPC & NEC specificationsSub-Zero Cold Climate Tolerances

Quick Summary & Key Answer

At 100% solids, one gallon of epoxy covers exactly 1,604 square feet at 1 mil thickness (or 160 sq ft at a standard 10-mil garage floor roll-on thickness). For a standard 2-car garage (400 sq ft) at 10 mils, you need 2.5 gallons of mixed epoxy (1.67 gallons resin and 0.83 gallons hardener at a 2:1 ratio).

1 mil = 1/1,000 of an inch.
100% solids epoxy does not shrink as it cures; solvent-based epoxies shrink by 40-50%.
Never alter the resin-to-hardener ratio; off-ratios result in sticky, uncured surfaces.

Interactive Calculator

Adjust inputs for real-time results

Surface Areasq ft

sq ft

Coating Thickness

Resin-to-Hardener Mix Ratio

Calculated OutputEpoxy Volume Sized

Total Mixed Epoxy Required

2.49 Galgallons

Part A (Resin) Needed: 1.66 gal (213 fl oz)
Part B (Hardener) Needed: 0.83 gal (106 fl oz)
Total Volume in Fluid Ounces: 319 fl oz
Coverage Rate at Selected Thickness: 160 sq ft / gal

Note: 100% solids epoxy yields 1,604 sq ft per gallon at 1 mil thickness. Order 10% extra for roller nap absorption and mixing bucket cling.

Concrete Surface Preparation

Epoxy will peel if applied to smooth concrete; diamond grind or acid-etch concrete to CSP-2 or CSP-3 profile before coating.

Frequently Asked Questions

Common questions regarding this calculation and code compliance

A typical 400-500 sq ft 2-car garage requires 2.5 to 3.5 gallons of 100% solids epoxy for a durable 10-to-12 mil base coat.