SettingsSettings for this calculationUS
The total asphalt surface area to seal.
Measure the driveway's length x width.
1 coat is standard for routine maintenance; 2 coats for a driveway that hasn't been sealed in years.
Applying more than 2 coats generally doesn't add much protection and risks a slippery, flaking surface.
Sealcoat needed
6 gallons
Rougher or more porous asphalt absorbs more sealer than a smooth, well-maintained surface — check your specific product's coverage rating.
- Area to seal (all coats)
- 430 sq ft
They open the calculator with your figures already in it
Asphalt Sealcoat Calculator: 6 gallons — shown in imperial, US market. The link sets both, so the result they see is the one on your screen.
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How this was calculated
Formula source(s)
- Squeegee-applied asphalt sealcoat typically covers about 70-80 sq ft per gallon per coat; spray application covers more area per gallon but is less common for DIY driveways
Inputs used
- Driveway Area
- 430 sq ft
- Number of Coats
- 1
Intermediate steps
- Area to seal (all coats)
- 430 sq ft
Confidence note: Rougher or more porous asphalt absorbs more sealer than a smooth, well-maintained surface — check your specific product's coverage rating.
What this calculation does not cover
- Coverage is held at a single constant of 80 sq ft (7.5 m²) per US gallon (3.8 L) per coat, the thin end of the 70-80 sq ft range this page cites, so a pail rated nearer 70 leaves you roughly a gallon short for every seven this returns.
- The second coat is charged at exactly the same rate as the first, because the arithmetic is only area multiplied by the number of coats, drawing no distinction between the pass that soaks into bare asphalt and the one laid over sealer already down.
- No waste allowance is folded in: the gallon count covers the measured surface and nothing else, so sealer left in the pail and on the squeegee, the overlap pulled past the driveway edges, and any separate oil-spot primer all sit outside the number.
- Whole gallons are what come back, since the fractional figure is rounded up, but sealer is sold in fixed container sizes and the result still has to be rounded a second time to what your supplier actually stocks.
- Both the headline number and the breakdown are reported in US gallons and square feet whatever units you type, because the area is converted to square feet before the coverage rate is applied to it.
- Entries are capped at two coats and at an area of roughly 10,800 sq ft (1,000 m²), so a third build-up pass or a full parking lot has to be split across more than one run.
Estimated cost — your price
This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.
Part of a bigger job
Or plan the space itself: measure it once, doors and windows included, and this figure comes back worked out on that space, with what goes with it.
Computed in your browser — nothing you enter is uploaded. Presented in US customary units and US trade terminology. Where a formula follows a published standard, that standard and its edition are cited beside it on this page; where none governs, the page says so. Local amendments override model codes — verify against the code in force where you build.
Sources checked 2026-09-05 · in the site-wide review of 2026-09-06 · v1.0.1
Regulatory standards & verification citations1
- Squeegee-applied asphalt sealcoat typically covers about 70-80 sq ft per gallon per coat; spray application covers more area per gallon but is less common for DIY driveways
Cite this page
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