How this calculator works
Asphalt sealer covers roughly 80 sq ft per gallon per coat. The calculator multiplies your driveway area by the number of coats and divides by that coverage.
480 sq ft ÷ 80 = 6 gallons → 2 five-gallon pails.
Use the label to plan the purchase
Coverage is a planning estimate: use the coverage and coat count on your exact product label, because porous asphalt, rough texture, and repairs can change yield. If your label gives a different coverage rate, divide total coat-area by that label rate and round each container purchase up. Round the estimate up to the container size you are buying — often 5-gallon pails. Fill cracks with a compatible crack filler and let repairs cure as the label directs before sealing; sweep and clean the surface first. Plan a second thin coat as a separate application after the first coat has dried for the label’s stated recoat time. Do not seal concrete with an asphalt driveway sealer; use a coating specifically labeled for concrete instead. If the pavement is failing rather than just faded, estimate a replacement with the asphalt calculator instead of resealing.
Frequently asked questions
How many gallons of sealer for a two-car driveway?
A typical 40×20 ft two-car pad is 800 sq ft. At 80 sq ft per gallon that is about 10 gallons for one coat or 20 gallons for two coats.
How many 5-gallon buckets do I need?
Divide the gallons by 5 and round up. Twenty gallons is four 5-gallon pails; 6 gallons is two pails.
How much does a gallon of driveway sealer cover?
About 80 sq ft per coat on older, porous asphalt; a bit more on smooth surfaces.
How often should I seal my driveway?
Every 2–3 years is typical, once the surface starts to fade or crack.
How much does it cost to seal a driveway?
Multiply the gallons or buckets needed by the product price, then add preparation, crack repair, delivery, or labor if applicable.
How many coats of driveway sealer should I apply?
Many asphalt sealers use two thin coats, but follow the product label for coverage, drying time, and application limits.