Driveway Sealer Coats Calculator
Estimate the sealer for an asphalt driveway — gallons and 5-gallon pails for one or more coats from the driveway size and coverage rate.
How it works
Area = length × width · Gallons = area × coats ÷ coverage-per-gallon · Pails = ⌈gallons ÷ 5⌉
Asphalt driveway sealer is quoted per gallon per coat, usually around 70–100 sq ft depending on how rough and porous the surface is. Multiply the driveway area by the number of coats and divide by that rate to get gallons, then round up to whole 5-gallon pails since that is how sealer is sold. Two thin coats almost always outlast one heavy coat, and a weathered, cracked surface soaks up noticeably more on the first pass.
Worked example
A 40 × 12 ft driveway is 480 sq ft. Two coats at 80 sq ft/gal is 480 × 2 ÷ 80 = 12 gal, which rounds up to 3 five-gallon pails; at $30 a pail that is $90.
Frequently asked questions
How many coats of driveway sealer?
Two thin coats is the standard recommendation — the first fills and primes the porous surface and the second builds the protective, uniform film. One coat may look fine at first but wears through faster, especially in tire tracks.
Why does the first coat use more?
Old, dry, or cracked asphalt is porous and drinks up the first coat, so real first-coat coverage can fall toward the low end of the range. The second coat goes onto an already-sealed surface and covers closer to the rated figure.
Is this the same as an asphalt-paving estimate?
No — this is for surface sealer (a coating), not for laying or resurfacing asphalt itself. Use an asphalt tonnage calculator when you are actually paving or adding a new layer of material.
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This calculator is for educational purposes. Double-check important results before acting on them.