Concrete Coating Coverage and Cost Calculator
Estimate the amount of concrete coating (paint, epoxy, sealer, or stain) required and the total material cost for your project based on surface area, product spread rate, number of coats, and price per unit.
Check product label — typical range: 200–400 sq ft/gal
Recommended: 10% for smooth surfaces, 15–20% for textured
Formulas Used
1. Surface Area
Area (sq ft) = Length × Width
2. Net Gallons Required
Gallonsnet = (Area × Number of Coats) ÷ Spread Rate
3. Gallons with Waste Factor
Gallonstotal = Gallonsnet × (1 + Waste% ÷ 100)
4. Gallons to Purchase
Gallonsbuy = ⌈ Gallonstotal ⌉ (ceiling — always round up)
5. Total Cost
Cost ($) = Gallonsbuy × Price per Gallon
6. Cost per Square Foot
Cost/sq ft = Total Cost ÷ Area
Assumptions & References
- Surface area is calculated as a simple rectangle (Length × Width). For irregular shapes, calculate each section separately and add the areas together.
- Spread rate (coverage rate) is taken from the product label and assumes a single coat applied to a smooth, properly prepared surface. Rough, porous, or previously uncoated concrete absorbs more product and will reduce effective coverage.
- A 10% waste factor is standard for smooth, interior slabs. Use 15–20% for textured, broom-finished, or exterior concrete (PDCA Industry Standards).
- Gallons are always rounded up to the nearest whole gallon to ensure full coverage — partial gallons are not typically sold.
- Typical concrete coating spread rates: Epoxy floor paint 200–300 sq ft/gal; Concrete sealer 300–400 sq ft/gal; Concrete stain 200–300 sq ft/gal; Polyurea/polyaspartic 250–350 sq ft/gal (manufacturer data).
- Two coats are recommended for most concrete coatings to achieve full opacity, durability, and moisture resistance (Sherwin-Williams, Rust-Oleum product guidelines).
- This calculator covers material cost only. Labor, surface preparation (grinding, etching, patching), primer coats, and topcoats are separate cost items.
- Prices vary by region and product tier. Always verify current pricing with your local supplier.