Concrete Driveway Sealer Calculator
Estimate the gallons of sealer a concrete driveway needs from its size, coats and coverage rate, with a cost estimate for the job.
How it works
Area = L × W · Sealed = area × coats · Gallons = ceil(sealed ÷ coverage) · Cost = gallons × price
Concrete sealer protects a driveway from water, salt and freeze-thaw damage, and most acrylic sealers cover about 200–300 ft² per gallon per coat. Two thin coats outperform one thick one, so plan on multiplying the slab area by two. Older, porous or broom-finished concrete absorbs more and sits at the low end of the coverage range; smooth, previously sealed surfaces go further. Always divide by the rate on your specific product.
Worked example
A 40 × 20 ft driveway is 800 ft². Two coats means covering 1,600 ft². At 250 ft² per gallon that is 1,600 ÷ 250 = 6.4 gallons, rounded up to 7 gallons to finish the job without running short.
Frequently asked questions
How often should I reseal a concrete driveway?
Most acrylic sealers last two to three years before they wear thin in the tyre tracks. Reseal when water stops beading on the surface, which is the clearest sign the coating has broken down.
One thick coat or two thin ones?
Two thin coats. A single heavy coat can trap solvent, bubble, or turn white (blush), and it wears unevenly. Two thin, even coats bond better and give more uniform protection.
Does new concrete need to cure first?
Yes. Fresh concrete should cure for about 28 days before sealing so the surface moisture and alkalinity have settled; sealing too early can cause adhesion failure and a cloudy finish.
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This calculator is for educational purposes. Double-check important results before acting on them.