Concrete Sealer Calculator
Enter the size of the slab, the finish and the sealer type to get gallons, how many one-gallon containers to buy, and a planning material cost. Coverage starts from typical rates for broom, stamped and exposed-aggregate surfaces; replace them with the number on your product data sheet. Do not seal until the concrete has cured and is dry.
Concrete Sealer Calculator — ConcreteNear.com
| Area | 480 ft² |
| Coverage used (per coat) | 175 ft² · typical starting rate |
| One-gallon containers | 4 |
⚠️ Do not seal new concrete until it has cured and the surface is dry. A sealer is not a repair for already-scaled concrete.
Cost estimate U.S. average prices
| Penetrating sealer (material) 4 gal × $45.00 | $180.00 |
| Estimated total | $180.00 |
| Cross-check: Installed sealer, cross-check 480 ft² × $0.75 | $360.00 |
- Do not seal until the slab has cured and is reasonably dry. NRMCA CIP 2 says late summer after a few dry days is an ideal time; follow your product data sheet.
- Silane and siloxane penetrating sealers are breathable and are the type NRMCA cites for deicer and freeze–thaw resistance on exterior slabs.
- Coverage here is a typical starting rate for this finish. Porous, dry, or heavily textured concrete takes more product — use the number on the can if you have it.
| Inputs | |
| Length | 24 ft |
| Width | 20 ft |
| Surface | Broom / plain |
| Sealer type | Penetrating (silane / siloxane) |
| Number of coats | 1 |
| Coverage per coat (0 = typical for this finish) | 0 ft² |
| Extra for waste & texture | 10% |
Planning estimate only — confirm with your supplier or contractor.
Prices used — edit any price to match your local quote
| Item | Unit price | Basis & source |
|---|---|---|
| Penetrating silane/siloxane sealer, per gallon per gal | starting estimate Starting retail estimate for a silane or siloxane penetrating sealer. Product grade changes the price a lot — replace with a local price. | |
| Sealer per ft² | starting estimate Starting estimate. |
How to use this calculator
- Measure the length and width of the area you will seal.
- Pick the surface (broom, stamped or exposed aggregate) and the sealer type.
- Enter the number of coats from the data sheet. Penetrating sealers are often one coat; acrylics are often two.
- If the can lists coverage, enter it. Otherwise the calculator uses a typical starting rate for that finish.
- Read gallons and cost, then confirm with the product and a local supplier.
Formulas
Area (ft²) = length × widthGallons = coats × area ÷ coverage (ft²/gal per coat) × (1 + waste %)Containers = gallons, rounded up to the next gallon
Questions
How much sealer do I need for a driveway?
A 24 × 20 ft driveway is 480 ft². One coat of a penetrating sealer at a typical 175 ft²/gal on a broom finish, plus 10% waste, is about 3.0 gallons — buy three 1-gallon containers. Stamped and exposed-aggregate surfaces take more product per gallon.
When can I seal new concrete?
After it has cured and the surface is reasonably dry. NRMCA CIP 2 says the concrete should be reasonably dry before a sealer is applied, and that late summer after a few dry days is an ideal time. Follow the manufacturer’s data sheet, and see first-winter care before you seal a new driveway.
Penetrating or acrylic?
Silane and siloxane penetrating sealers soak in and stay breathable; NRMCA cites them for deicer and freeze–thaw resistance on exterior slabs. Acrylics form a film, change the sheen, and usually need more frequent recoating. Use what the installer or the data sheet specifies.
Sources & assumptions
Prices checked 2026-11-10. State pricing multiplies national figures by the U.S. Bureau of Economic Analysis regional price parities (goods for materials, services for labor and services). RPPs compare general consumer price levels (U.S. = 100). They are not construction-specific; we use RPP Goods for materials and RPP Services: Other (excludes rents) for labor and services.
Starting estimates No public price series was found for: Penetrating silane/siloxane sealer, per gallon; Sealer; Acrylic concrete sealer, per gallon. These defaults are editable placeholders — replace them with a local quote.
Results are planning estimates, not quotes or engineering advice. Codes, specifications and your supplier's numbers govern.
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