Concrete Sealer Calculator
Calculate sealer gallons, cost, and recoat schedule based on sealer type, surface texture, and number of coats.
About this calculator
Sealer coverage isn't just a function of area — it depends on what kind of sealer you're applying and how textured the surface underneath it is, and this calculator combines both before landing on a gallon count. Seven sealer types each carry their own base coverage rate (150-300 sq ft per gallon on a smooth surface), cost per gallon ($35 for basic acrylic cure-and-seal up to $90 for polyaspartic), and recoat interval, which ranges from as little as a year for cure-and-seal to five years for penetrating silane/siloxane or epoxy sealers — meaning the cheapest sealer up front is often the most expensive over a five-year horizon once reapplication labor is counted. Surface texture then multiplies effective coverage downward: this calculator applies a 30% coverage-rate penalty for a stamped or heavily textured surface relative to a smooth troweled one, which works out to roughly 43% more sealer needed to cover the same footprint, since it's the reciprocal of the reduced coverage rate that determines how much extra material the texture actually soaks up.
Solvent-based acrylic and epoxy sealers trigger an automatic xylene cleanup-solvent estimate at roughly one gallon of xylene per three gallons of sealer, since those two types require solvent cleanup that water-based products don't. Dry time between coats varies by sealer chemistry too — from as little as an hour for fast-curing polyaspartic up to twelve hours for epoxy — which matters for scheduling a same-day multi-coat application.
Inputs
Results
Total sealer (gallons)
5.18
How to Use This Calculator
- Enter the total concrete surface area in sq ft to be sealed.
- Select the sealer type (1–7): acrylic, solvent acrylic, water-based acrylic, penetrating, epoxy, polyurethane, or polyaspartic.
- Choose surface texture (1=smooth, 2=broom-finished, 3=stamped/heavy texture) — rougher surfaces absorb more sealer.
- Set the number of coats (typically 2; penetrating sealers often need only 1).
- Read Total Sealer (gallons) and Total Material Cost to finalize your material purchase.
- Note Recoat Interval (years) and Dry Time Between Coats (hrs) for scheduling the application.
How the result changes with Surface area (sq ft)
| Surface area (sq ft) | Total sealer (gallons) |
|---|---|
| 250 | 2.59 |
| 375 | 3.88 |
| 750 | 7.76 |
| 1,250 | 12.94 |
What each input means
- Surface area (sq ft)
- Total concrete surface area to seal.
- Sealer type (1-7)
- 1=acrylic cure&seal, 2=solvent acrylic, 3=water acrylic, 4=penetrating, 5=epoxy, 6=polyurethane, 7=polyaspartic.
- Surface texture (1-3)
- 1 = smooth/troweled, 2 = broom-finished, 3 = stamped/heavy texture.
- Number of coats
- Most sealers need 2 coats. Penetrating sealers often need just 1.
- Waste factor (%)
- Material waste from overspray, drips, and roller absorption.
What each result means
- Total sealer (gallons)
- Gallons of sealer to purchase for all coats plus waste.
- Gallons per coat
- Sealer needed for a single coat (before waste factor).
- Total material cost ($)
- Sealer plus solvent/cleanup costs.
- Cost per sq ft ($)
- Material cost per square foot of sealed area.
- Sealer cost ($)
- Cost of the sealer product alone.
- Xylene / solvent (gal)
- Cleanup solvent needed for solvent-based products (0 for water-based).
- Recoat interval (years)
- Typical lifespan before re-sealing is needed.
- Dry time between coats (hrs)
- Minimum dry time between coats at 70degF.
- Total cure/dry time (hrs)
- Total inter-coat drying time for all coats.
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersSurface area (sq ft) = 500, Sealer type (1-7) = 3, Surface texture (1-3) = 2, Number of coats = 2 = 5 input(s) provided
- Calculate Total sealerTotal sealer = gallonsPerCoat * numCoats * (1 + wastePct / 100)5.18 = 5.18
- Calculate Gallons per coatGallons per coat = areaSqFt / max(1, effectiveCoverage)2.35 = 2.35
- Calculate Total material costTotal material cost = sealerCost + xyleneCost232.94 = $232.94
Engine last updated . Checked against 3 independently-derived tests — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.
Frequently Asked Questions
Why might a cheaper sealer cost more money over time?
Because recoat interval varies a lot by sealer chemistry — acrylic cure-and-seal is the cheapest per gallon but typically needs reapplying every year, while penetrating silane/siloxane or epoxy sealers cost more up front but can last five years between coats. Over a five-year span, the cheap sealer applied five times can easily cost more in labor and material than the expensive one applied once.
Why does surface texture change how much sealer I need?
A stamped or heavily textured surface has more actual surface area within the same footprint than a smooth troweled surface does — all those grooves and ridges add up. This calculator applies roughly a 30% coverage penalty for heavy texture and about 15% for broom-finished surfaces relative to smooth, so the same square footage needs meaningfully more sealer once texture is added.
Which sealer types need xylene for cleanup?
Solvent-based acrylic and epoxy sealers both trigger an automatic xylene estimate at roughly one gallon of xylene per three gallons of sealer used, since their solvent carriers need a matching solvent for tool and equipment cleanup. Water-based acrylic, penetrating, polyurethane, and polyaspartic sealers in this calculator don't add any xylene requirement.
How long should I wait between coats?
It depends heavily on sealer type — fast-curing polyaspartic can be recoated in about an hour, water-based acrylic in around two, most acrylics in four, polyurethane in eight, and epoxy needs roughly twelve hours between coats. Recoating before the prior coat has set enough can trap solvent or cause the layers to blend improperly instead of curing as distinct coats.
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