Calculate how many gallons of concrete sealer you need. Enter surface area and sealer type to get coverage and cost estimates.
Sealing concrete protects it from moisture penetration, staining, freeze-thaw damage, and UV degradation. Different sealer types have different coverage rates, and choosing the right one for your application is just as important as calculating the right quantity.
This calculator helps you determine how many gallons of concrete sealer you need based on your surface area and sealer type. Penetrating sealers (silane/siloxane) typically cover 150–300 square feet per gallon, while film-forming sealers (acrylic, epoxy, polyurethane) cover 200–400 square feet per gallon.
Most sealers require two coats for full protection, and this calculator accounts for multi-coat applications. It also estimates cost based on per-gallon pricing to help you budget for the sealing portion of your concrete project.
Precise calculations are essential for meeting regulatory requirements, passing inspections, and ensuring the long-term structural integrity and safety of the completed project. This data-driven approach helps contractors minimize rework, avoid delays caused by material shortages, and deliver projects on time and within the agreed budget.
Concrete sealers are sold by the gallon, and coverage rates vary widely by type and concrete surface condition. Rough or broom-finished concrete absorbs more sealer than smooth troweled surfaces. This calculator gives you accurate gallon counts so you purchase the right amount without multiple store trips. This quantitative approach replaces rule-of-thumb estimates with precise calculations, minimizing material waste and reducing the likelihood of costly change orders during construction.
Gallons per coat = Surface area ÷ Coverage rate (sq ft/gal) Total gallons = Gallons per coat × Number of coats Coverage rates: Penetrating=200, Acrylic=300, Epoxy=250, Polyurethane=350
Result: 4 gallons, $180
600 sq ft with acrylic sealer at 300 sq ft/gal: 2 gallons per coat × 2 coats = 4 gallons. At $45/gallon = $180 total sealer cost.
Penetrating sealers (silane, siloxane, siliconate) soak into the concrete and repel water from within. They don't change the appearance and are ideal for exterior flatwork. Film-forming sealers (acrylic, epoxy, polyurethane) create a coating on the surface that adds sheen and color enhancement.
Penetrating sealers are best applied with a pump sprayer in one or two flood coats. Film-forming sealers can be sprayed or rolled. Always back-roll sprayed coatings to ensure even coverage. Work in sections to maintain a wet edge.
Before recoating, check adhesion by applying a small test area. If the new sealer peels, the old sealer must be stripped first. Acrylic sealers can usually be recoated directly; epoxies and polyurethanes may require scuffing or chemical stripping.
Penetrating silane/siloxane sealers are best for driveways because they repel water and deicing salts without changing the surface appearance. They last 5–10 years and don't peel or flake like film-forming sealers.
Penetrating sealers last 5–10 years. Acrylic sealers last 1–3 years. Epoxy and polyurethane coatings last 3–5 years. High-traffic areas may need more frequent resealing.
Yes, stamped concrete should always be sealed with an acrylic sealer to protect the color and texture. Apply 2–3 coats for best results. Reapply every 1–2 years to maintain the appearance.
Film-forming sealers (especially glossy acrylics and epoxies) can be slippery when wet. Add a non-skid additive (fine sand or polymer beads) to the final coat for exterior surfaces and pool decks.
New concrete should cure for at least 28 days before applying most sealers. Some penetrating sealers can be applied after 7–14 days. Always check the sealer manufacturer's instructions for minimum cure time.
Rough or broom-finished concrete absorbs 20–40% more sealer than smooth concrete. Reduce the coverage rate by 25% (e.g., use 225 sq ft/gal instead of 300) for textured surfaces.