Asphalt Sealer Calculator

An asphalt sealer calculator returns the gallons of driveway sealcoat needed. It multiplies area by the number of coats, divides by the coverage rate, and rounds up to a whole gallon. A 500 sq ft driveway with one coat at 70 sq ft per gallon needs 8 gallons. A second coat raises the total to 15 gallons.

Last reviewed September 2026Method & sources Report an error

Not to scale.

Sealer Needed

8 gal

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Asphalt sealer8 gallons

Breakdown
Sealer Needed	8 gal
Driveway Area	500 sq ft
Total Coverage Needed (area × coats)	500 sq ft
Estimated Cost

How to Calculate Asphalt Sealer

Driveway area times the number of coats gives the total coverage needed. A 500 sq ft driveway with 2 coats needs 1,000 sq ft of coverage, not 500. Dividing by the product's coverage rate (commonly 50-100 sq ft per gallon per coat, printed on the container) and rounding up gives the gallons to buy.

Example: 50 ft × 10 ft driveway, 1 coat, 70 sq ft/gal coverage

A 50 ft × 10 ft driveway, 1 coat, 70 sq ft/gal coverage: 1. Area: 50 × 10 = 500 sq ft 2. Total coverage needed: 500 × 1 = 500 sq ft 3. Gallons needed: 500 ÷ 70 = 7.14, rounded up to 8 gallons Applying a second coat on the same driveway would double the coverage needed to 1,000 sq ft, requiring 15 gallons instead of 8.

Asphalt Sealer: Compare Scenarios

Scenario	Sealer Needed	Driveway Area	Total Coverage Needed (area × coats)
Small (20×10 ft single-car driveway)	3 gal	200 sq ft	200 sq ft
Medium (50×10 ft driveway)	8 gal	500 sq ft	500 sq ft
Large (100×16 ft long double driveway)	23 gal	1,600 sq ft	1,600 sq ft

What Is Asphalt Sealer?

An asphalt sealer calculator converts a driveway's area, coat count, and a product's coverage rate into the gallons of sealcoat needed to protect and refresh an asphalt driveway's surface. Sealcoat is applied noticeably thicker than paint, so its coverage rate per gallon runs lower. Always check your specific product's label, since coverage varies with the driveway's texture and porosity.

Asphalt Sealer: Pros and Cons

Pros

Rounds up to a whole gallon automatically, matching how sealer is actually sold
Coverage rate is a direct, adjustable input, since it varies meaningfully by product and by how porous or textured the asphalt surface is
Separates total coverage from gallons needed, making it clear why a second coat roughly doubles material cost

Cons

Doesn't measure your driveway's area for you. An irregular shape needs its area estimated separately or broken into rectangular sections
Doesn't account for cracks needing crack filler before sealing, which is a separate product and step from the sealer coverage calculated here
A new asphalt driveway typically needs to cure for a period (often 90 days or more) before its first sealcoat. This calculator estimates material only, not timing

Asphalt Sealer: What a Pro Checks

Let new asphalt cure before its first sealcoat. Waiting at least 90 days (some sources suggest up to a full year) gives volatile oils time to evaporate, and sealing too early can trap them and keep the coat from bonding properly.
Fill cracks with a dedicated crack filler before you sealcoat. Sealer alone isn't designed to bridge a crack or stop water from getting underneath it.
Plan on resealing every 2-3 years for most driveways. A faded, gray, dry-looking surface instead of a rich black one is a common sign it's due.

Frequently Asked Questions

How many gallons of driveway sealer do I need?

Divide your driveway's area by the sealer's coverage rate (commonly 50-100 sq ft per gallon per coat) and round up. A 500 sq ft driveway with one coat at 70 sq ft/gal needs about 8 gallons.

How often should I seal my asphalt driveway?

Every 2-3 years is a commonly recommended interval for most residential driveways, though climate, sun exposure, and traffic all affect how quickly a sealcoat wears. A driveway showing a faded, gray, or dry appearance rather than a rich black color is often due for resealing.

How long does asphalt need to cure before sealing?

New asphalt is commonly recommended to cure for at least 90 days (some sources suggest up to a full year) before its first sealcoat, to let volatile oils in the asphalt evaporate. Sealing too early can trap those oils and prevent proper adhesion.

Do I need one coat or two coats of sealer?

One coat is standard maintenance for a driveway in reasonably good condition. Two coats are sometimes recommended for a driveway that hasn't been sealed in a long time, shows more wear, or is being sealed for the first time. Check your specific product's recommendation.

Should I fill cracks before sealing my driveway?

Yes. Cracks are typically filled with a separate crack filler product before sealcoating, since sealer alone isn't designed to bridge a crack and won't stop water intrusion through it. Crack filler material is a separate calculation from the sealer coverage estimated here.

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