Driveway Sealer Calculator
Sealing is not paving: this is for an existing asphalt driveway that needs a fresh coat, not a new driveway. Enter the size and coats to get gallons and buckets. Runs 100% in your browser.
Driveway Sealer Calculator
About this driveway sealer calculator
Sealer math is area times coats divided by coverage: gallons = length × width × coats ÷ coverage per gallon, then buckets = ceiling(gallons ÷ 5) because sealer is sold in 5-gallon buckets. A 600 sq ft driveway with 1 coat at 80 sq ft per gallon needs 7.5 gallons, or 2 buckets. Our driveway sealer guide covers coverage by surface condition and the prep that makes a coat last.
Coverage is where estimates go wrong. A smooth, previously sealed driveway takes about 100 sq ft per gallon; a rough, weathered, or never-sealed surface drinks sealer and drops toward 80 sq ft per gallon or less. If your driveway is rough, use 80 and buy the extra bucket — an unopened bucket returns, a half-sealed driveway does not. Two thin coats outlast one thick coat: a thick coat can skin over, trap moisture, and peel, while two thin coats cure properly and cover evenly.
This calculator is for sealing only. If the driveway has cracks wider than a pencil, potholes, alligator cracking, or standing water that never drains, sealer is cosmetic over a structural problem — those need crack filler, patching, or repaving first, and our asphalt calculator covers new asphalt quantities. Sealer also needs dry weather and a clean surface: sweep, pressure-wash, let it dry fully, and do not seal within 24 hours of rain.
How to use
- Measure the driveway length and width in feet (split L-shaped or curved drives into rectangles and add them).
- Choose coats — 1 for a maintenance reseal, 2 for a worn or first-time seal.
- Choose coverage — 80 sq ft/gal for rough or first-coat surfaces, 100 sq ft/gal for smooth reseals.
- Press Calculate for gallons and 5-gallon buckets.
Good to know
- Rectangular driveways only, or rectangles added together. Curved and irregular drives need the area measured in sections.
- Coverage is an estimate (80–100 sq ft/gal typical) — the coverage printed on your sealer bucket governs, and rough or porous asphalt can use more.
- Sealer only: it does not repair cracks, potholes, drainage, or base failure. Fix those before sealing, or the coat will fail over them.
Formula & standards
Formula: Gallons = length × width × coats ÷ coverage per gallon; buckets = ceiling(gallons ÷ 5).
Standard: None — coverage (80–100 sq ft/gal typical) comes from the product label; no code governs sealer quantity.
Waste allowance: Rough or never-sealed asphalt drinks sealer; two thin coats beat one thick coat that skins and peels.
Frequently asked questions
How much driveway sealer do I need for 600 square feet?
A 600 sq ft driveway with 1 coat at 80 sq ft per gallon needs 7.5 gallons, or 2 five-gallon buckets. At 100 sq ft per gallon it needs 6 gallons, still 2 buckets.
How many square feet does a gallon of driveway sealer cover?
Typically 80–100 sq ft per gallon per coat: about 80 on rough or first-coat surfaces, about 100 on smooth, previously sealed asphalt. Check your bucket — it governs.
Is one coat or two coats of driveway sealer better?
Two thin coats outlast one thick coat on worn or first-time seals: they cure properly and cover evenly. One coat is enough for a routine maintenance reseal.
How many 5-gallon buckets of sealer do I need?
Divide your gallons by 5 and round up. A 600 sq ft driveway at 1 coat needs 2 buckets; a 1,200 sq ft driveway at 2 coats needs about 6 buckets at 80 sq ft/gal.
Does driveway sealer fix cracks?
No — sealer is a protective topcoat, not a repair. Fill cracks and patch potholes first, or the sealer will fail over them.