Coverage rates for sealer
Concentrated coal-tar or asphalt emulsion sealer covers about 80–100 sq ft per gallon per coat after dilution, and driveways want two coats (three on traffic lanes). The calculator computes gallons from your area and coat count — most 5-gallon pails concentrate and get cut 10–30% with water on site.
Two thin coats beat one flood
Squeegee the first coat thin and let it fully dry — overnight if cool. The second coat goes faster and looks better. Spray systems cover fastest for big driveways; for a two-car pad, a squeegee and one afternoon are enough. Keep vehicles off for 48 hours after the final coat.
Sources and standards
Where these figures come from
Every formula on this page is implemented from the published reference material below. Where a value depends on a regional code, the calculator lets you override it rather than assuming one jurisdiction.
- National Asphalt Pavement Association — mix design, lift thickness and compaction guidance.
- Federal Highway Administration — pavement design and materials references.
Figures, formulas and reference tables last verified: 19 September 2026.