Garage Floor Epoxy Calculator
Calculate how many gallons or liters of epoxy coating you need for your garage floor.
Includes primer and topcoat estimates.
Epoxy garage floor coating is one of the most popular DIY home improvement projects. It protects concrete from stains, chemicals, and abrasion while creating an attractive, easy-to-clean surface. Getting the quantity right is important — running out mid-project creates visible seams and color differences.
Understanding epoxy coverage: Epoxy coverage is listed on the product as “square feet per gallon” or “square meters per liter.” Typical coverage rates:
- Penetrating primer / sealer: 200–250 sq ft / gallon (5–6 m² / liter)
- Epoxy base coat (100% solids): 100–160 sq ft / gallon (2.5–4 m² / liter)
- Water-based epoxy: 150–200 sq ft / gallon (3.7–5 m² / liter)
- Polyaspartic / polyurea topcoat: 200–250 sq ft / gallon (5–6 m² / liter)
The concrete porosity factor: Fresh or very porous concrete absorbs more product. Old, sealed, or smooth concrete requires less. Porous surfaces can increase consumption by 20–30%.
A complete epoxy system typically includes:
- Acid etch or grinding (surface preparation — not purchased by volume)
- Primer coat (optional but recommended — improves adhesion)
- Base coat (the main color epoxy — may require 1–2 coats)
- Decorative flakes (optional vinyl color chips — typically broadcast at 200g–600g per m²)
- Topcoat / sealer (for durability and UV resistance)
Two-car garage reference: A standard 2-car garage is approximately 57 m² (600 sq ft). A full system would require approximately:
- Primer: 2 gallons (7.6L)
- Base coat: 4–5 gallons (15–19L)
- Topcoat: 2 gallons (7.6L)
Temperature matters: Epoxy should be applied when both the air and concrete temperatures are between 10°C–30°C (50°F–85°F). Avoid applying if rain is expected within 24 hours. Very hot concrete causes epoxy to bubble and cure too quickly.