Asphalt Sealer Calculator

Sealing an asphalt driveway or parking area takes more product than most people expect, and running short mid-job means visible lap marks and uneven coverage. Enter your area's length and width, then select your surface condition, application method, and number of coats into the Asphalt Sealer Calculator to find exactly how many gallons of sealer you need. Secondary outputs include total area, coverage rate, and estimated material cost.

ft

Length of the area to be sealed

ft

Width of the area to be sealed

Surface condition affects sealer absorption rate

Application method affects coverage rate

Double coat recommended for driveways in poor condition

Results

Sealer Needed

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Total Area

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Coverage Rate

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Estimated Material Cost

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Frequently Asked Questions

How do I calculate the square footage of my driveway?

Measure the length and width of your driveway in feet, then multiply them together. For irregular shapes, break the area into rectangles and add them up.

What's the difference between spray and hand application coverage?

Spray application typically covers 100 square feet per gallon, while hand/brush application covers 50-60 square feet per gallon due to thicker application and less even distribution.

When should I apply two coats of sealer?

Two coats are recommended for driveways in poor condition with cracks and weathering. The second coat typically requires about 1/3 less product than the first coat.

How does surface condition affect sealer coverage?

Poor condition surfaces with cracks and porosity absorb more sealer, reducing coverage. Good condition surfaces provide better coverage rates since they're less porous.

Can I use this calculator for extremely porous asphalt?

This calculator is not recommended for extremely porous asphalt situations, as coverage will be significantly lower than even the 'poor condition' calculation shows.

What's the average cost of asphalt sealer per gallon?

Asphalt sealer typically costs between $25-40 per gallon, depending on the brand and quality. Premium sealers may cost more but often provide better durability.

How often should I seal my driveway?

Most driveways should be sealed every 2-3 years, depending on traffic, weather conditions, and the quality of the previous sealcoat application.

What factors can reduce sealer coverage?

Factors that reduce coverage include surface porosity, temperature during application, multiple coats, and application method. Always order 10-15% extra sealer for contingencies.