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Concrete & MasonryConcrete Sealer Calculator — How Much Sealer Do I Need?
Estimate sealer for a concrete patio, driveway, or garage floor. Coverage varies a lot by sealer type, so treat this as a starting point and trust the product label.
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How this calculator works
We multiply length × width by the number of coats and divide by about 250 sq ft per gallon — a mid-range figure. Penetrating sealers cover more (≈300–400 sq ft); film-forming and decorative sealers cover less (≈150–250). The label is the final word.
What changes how much you need
- Coverage swings widely by product type — always check the can.
- Bare or porous concrete soaks up the first coat; the second goes further.
- Two thin coats outperform one thick coat and avoid a cloudy finish.
- Most sealers need reapplying every 1–3 years depending on traffic and exposure.
Frequently asked questions
How much sealer for a 2-car driveway?
A typical 20×20 ft driveway (400 sq ft) at two coats needs roughly 3 gallons at 250 sq ft/gallon — but check your sealer’s rated coverage.
How many coats of concrete sealer?
Two thin coats is standard. One thick coat can trap solvent and cloud or peel.
How often should I reseal concrete?
Every 1–3 years for most patios and driveways; sooner in harsh climates or heavy traffic.