Asphalt Sealcoat Calculator
Estimate driveway sealer gallons or liters and the number of whole containers from pavement area, coats, and the coverage rate on the product label.
Driveway sealer inputs
Starting values are an example. Replace the coverage rate and container size with the product label values.
Asphalt sealcoat estimate
Calculated sealer
20.00 gal
before allowance
Order volume
20.00 gal
before container rounding
Whole containers
4
5 gal each
Purchased volume
20.00 gal
0.00 gal above order volume
Driveway sealer calculator formula
The result is first calculated as liquid volume, then rounded upward to the selected container size. The optional planning allowance is applied before container rounding so the two effects remain visible.
Worked asphalt sealing example
For an illustrative 1,000 sq ft driveway, two coats, and a label rate of 100 sq ft per gallon per coat: 1,000 × 2 ÷ 100 = 20 gallons. With 5-gallon pails, that is four whole containers before any allowance. This is a math example, not a universal coverage recommendation.
Measure the surface area before sealcoating
For a rectangular driveway, multiply length by width. Split curved or irregular pavement into smaller rectangles and circles, total those areas, and subtract large uncoated sections. Use the measured pavement area—not the property area—in the calculator.
Use the product coverage rate
Asphalt sealer coverage can change between products and between coats. Surface texture, porosity, preparation, application equipment, and permitted dilution also affect use. Read the technical data and label, then enter the stated square feet per gallon or square meters per liter for one coat.
Sealcoat does not replace asphalt repair
Surface coating is not a structural repair and should not be counted as crack filler or pothole patch material. Estimate localized failures with the asphalt patch calculator, read the cold patch asphalt guide, and use this tool only for the surface sealer quantity.
Related driveway planning tools
For new pavement or resurfacing, estimate compacted material with the asphalt driveway cost calculator. For a reclaimed surface or base, compare the asphalt millings calculator. Return to the core asphalt tonnage calculator for general paving quantities.