Driveway Sealer Calculator
Pails of asphalt sealer for a driveway, by coats and coverage.
Input sheet
DIY at your own risk. Calcora's calculators and guides are general estimates and information only — not professional, engineering, legal, or safety advice. Always verify local building codes and permit requirements, and hire a licensed pro for electrical, gas, plumbing, structural, or any work you're not fully comfortable doing yourself.
Asphalt sealer is bought in 5-gallon pails, and the coverage number on the pail assumes a surface your driveway may not have. This calculator turns area, coats, and honest coverage into a pail count.
How it works
Driveway area × coats ÷ coverage per 5-gallon pail, rounded up. A pail covers roughly 250–400 sq ft per coat depending on surface porosity.
Coverage per pail runs 250–400 sq ft per coat. Fresh, smooth, previously-sealed asphalt hits the high end; aged, gray, porous asphalt drinks sealer and lands near the low end — especially on the first coat, which is why the default sits at 350 with a note to drop it for old surfaces.
Two thin coats outlast one thick one. Thick sealer skins over, stays soft underneath, and tracks into the garage; the second thin coat also typically covers further than the first because the surface is already sealed.
Pails = driveway area × coats ÷ coverage per pail, rounded up.
Worked examples
A 50 × 12 ft driveway, two coats at 350 sq ft per pail. → 4 pails.
600 sq ft × 2 = 1,200; ÷ 350 = 3.4, rounded up to 4 pails.
A 400 sq ft parking pad, two coats. → 3 pails.
400 × 2 = 800 ÷ 350 = 2.3 → 3 pails.
Tips & gotchas
- Fill cracks with crack filler and let it cure before sealing — sealer is a surface coat, not a crack repair.
- Seal when daytime temps hold above 50°F with no rain for 24–48 hours; cool, damp cures fail early.
- Never seal asphalt younger than about 6 months — new pavement needs to oxidize and harden first.
FAQ
How often should I seal?
Every 2–3 years. Sealing fresh asphalt too soon is the classic mistake — wait at least 6 months after paving.
How often should I re-seal?
Every 2–3 years. Annual sealing builds up a layer that cracks and flakes; sealing only when the surface grays keeps the film thin and bonded.
Coal tar or asphalt emulsion?
Asphalt-emulsion sealers are the widely available, lower-odor option; coal-tar products are more durable but banned in a growing list of states and municipalities.
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