This sealcoat calculator tells you how much driveway sealer to buy. Most sealer calculators use one fixed coverage figure. This one starts from the coverage rates manufacturers actually print on their data sheets, which change with the type of sealer and how rough or porous your asphalt is. It also adds a second coat, waste, crack filler and a DIY vs pro cost check.
Quick answer: gallons = square feet × coats ÷ coverage per gallon. Ready-to-use asphalt emulsion sealer typically covers about 65 to 105 sq ft per gallon per coat, depending on the surface.
A 20 × 24 ft two-car driveway (480 sq ft) needs about 13 gallons for two coats at 75 sq ft per gallon, which is 3 pails of 4.75 gallons.
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How Far Does a Pail of Driveway Sealer Go?
Coverage depends mostly on the surface. Smooth asphalt that has been sealed before soaks up little, so a pail goes further. Rough, open-textured or never-sealed asphalt absorbs the first coat, and coarse "road-grade" mixes with large stone use even more. The figures below come straight from manufacturer data sheets and are per coat.
| Sealer and surface | Per container | Sq ft per gallon |
|---|---|---|
| Asphalt emulsion, smooth or previously sealed (4.75 gal) | 400–500 sq ft | 84–105 |
| Asphalt emulsion, rough or unsealed (4.75 gal) | 300–400 sq ft | 63–84 |
| Heavy-duty asphalt emulsion, average condition (5 gal) | 380 sq ft | 76 |
| Filler-sealer, smooth to rough (5 gal) | 250–400 sq ft | 50–80 |
| Pro sand-filled emulsion or coal tar, mixed material | n/a | 70–82 |
| Acrylic, good / moderate / poor (3.4 gal, two coats) | 400 / 300 / 200 sq ft | 235 / 176 / 118 |
Sq ft per gallon = coverage per container ÷ gallons in the container. The acrylic sheet quotes coverage for two coats, so its per-coat figure is twice the area divided by 3.4 gallons. Sources are listed at the bottom of the page.
The calculator's built-in defaults sit at the conservative end of these ranges (85, 75 and 65 sq ft per gallon for retail emulsion), so you are more likely to have a little left over than to run out halfway down the driveway. If your product's label gives a different number, type it into the coverage box.
The Sealcoat Formula, Step by Step
- Measure the area. Length × width in feet. Split L-shaped driveways and turnarounds into rectangles and add them. A 12 × 60 ft driveway is 720 sq ft.
- Multiply by the number of coats. Two coats on 720 sq ft is 1,440 sq ft of coverage.
- Divide by the coverage rate. At 65 sq ft per gallon (rough, first-time seal): 1,440 ÷ 65 = 22.2 gallons.
- Add waste. 5% for overlap, edges and what stays in the pail: 22.2 × 1.05 = 23.3 gallons.
- Round up to whole containers. 23.3 ÷ 4.75 = 4.9, so buy 5 pails.
For crack filler, the volume is length × width × depth. One gallon is 231 cubic inches, so 100 ft of crack that is 1/2 inch wide and 1/2 inch deep holds 100 × 12 × 0.5 × 0.5 = 300 cubic inches, or about 1.3 gallons.
When to Sealcoat: Cure Time, Temperature and Rain
New asphalt needs time for its lighter oils to work out before it is sealed. Labels disagree on how long: the data sheets we checked ask for at least six months or a full summer season, and one asks for twelve months. A simple test from one manufacturer: if water still beads up on the pavement, it has not cured. Patches and filled cracks also need to cure first (24 hours for crack repairs on one sheet, 30 to 90 days for a cold patch).
| Product type | Minimum temperature | Dry weather needed | New asphalt wait |
|---|---|---|---|
| Asphalt emulsion (retail) | 55 °F and rising (ground and air) | No rain likely for 36 hours | 12 months / one full season |
| Cold-weather emulsion | 40 °F and rising | No rain for 36 hours | One full season |
| Heavy-duty asphalt emulsion | 60 °F and rising, below 90 °F | No rain for 24–36 hours | 6 months or a full summer |
| Filler-sealer | 50 °F | No rain, frost or sub-50 °F for 48 hours | 6 months |
| Acrylic | 50 °F and rising | No rain for 36 hours | 12 months |
| Pro sealer (commercial spec) | 50 °F surface and air | No drop below 50 °F for 24 hours | Per contractor |
How often to reseal depends on traffic, sun and winter salt. One sealer manufacturer recommends resealing about every three years, sooner with heavy traffic or harsh winters, and contractors commonly quote two to three years for driveways. Sealing much more often than needed builds up excess sealer that can peel.
Coal Tar Sealer Bans
Coal-tar-based sealer has been commonly used in the central, southern and eastern US, while asphalt-based sealer dominates in the West. The US Geological Survey reports that coal-tar sealcoat contains about 1,000 times more PAHs (polycyclic aromatic hydrocarbons, some of which are classified as probable human carcinogens) than asphalt-based sealcoat, and that its worn particles end up in house dust and runoff. Several states now restrict it:
- Washington: sale and application banned under a 2011 law (RCW 70.295).
- Minnesota: state law prohibits selling or applying coal tar sealant on asphalt surfaces (Minn. Stat. 116.202).
- New York: sale banned from November 8, 2022 and use from November 8, 2023.
- Maryland: since October 1, 2023, high-PAH coal tar sealant may not be sold or applied to driveways and parking areas.
Many cities and counties elsewhere have their own bans, and other states have considered or passed bills since. Check your local rules before buying, and if you hire a contractor, ask which product they use. Asphalt emulsion and acrylic sealers are available everywhere.
Squeegee vs Spray Application
Homeowners almost always use a squeegee or brush. It works the sealer into the surface pores and is the method retail labels are written for; one manufacturer specifically warns that rollers are the wrong tool for its emulsion sealer (its acrylic product, on the other hand, is applied with a roller). Contractors use spray rigs or mechanical squeegee units. The commercial spec we cite allows either, but calls for the same 70 to 82 sq ft per gallon of mixed material per coat whichever way it goes on. In other words, the quantity is set by the coverage rate, not by the tool. Two thin coats beat one heavy coat: heavy coats cure unevenly and track.
Worked Examples
Example 1: Two-car driveway, second time sealing
20 × 24 ft = 480 sq ft. Two coats of retail asphalt emulsion at 75 sq ft per gallon (average condition): 480 × 2 ÷ 75 = 12.8 gallons, plus 5% = 13.4 gallons. That is 13.4 ÷ 4.75 = 2.8, so 3 pails.
Example 2: Long, rough driveway, first seal, DIY vs pro
12 × 60 ft = 720 sq ft, never sealed, so 65 sq ft per gallon. Two coats: 720 × 2 ÷ 65 = 22.2 gallons, plus 5% = 23.3 gallons, or 5 pails. At $30 a pail the sealer costs $150. At the $1.05 per sq ft that cost guides quote as typical, a contractor would charge about $756. Add 100 ft of 1/2 × 1/2 inch cracks and you need about 1.3 gallons of crack filler as well.
Example 3: Small commercial lot, contractor mix
9,000 sq ft, two coats of sand-filled mixed sealer at 76 sq ft per gallon: 9,000 × 2 ÷ 76 = 236.8 gallons, plus 5% = 248.7 gallons of mixed material, or 5 drums of 55 gallons (4.5 drums, rounded up). Because the mix includes water and sand, the amount of concentrate is lower. The spec we cite puts concentrate coverage at 100 to 120 sq ft per gallon per coat once mixed.
Tips for Getting the Quantity Right
- Use the label, not the marketing. The coverage on the front of a pail is often the best case. Use the data sheet's figure for your surface condition.
- Mix pails together. Labels recommend "boxing" (blending) pails so the color and solids stay even across the driveway.
- Buy one extra pail for rough surfaces. Unopened pails can usually be returned, and running out mid-coat leaves a visible lap line.
- Fix holes first. Sealer does not fill potholes. Patch them with the cold patch calculator and let the patch cure before sealing.
- Budget the whole job. If you are paving new, the driveway cost calculator includes future sealcoat in the lifetime cost, and the asphalt calculator works out the tons for the paving itself.
Related Calculators
Frequently Asked Questions
How much driveway sealer do I need?
Multiply your driveway's square footage by the number of coats and divide by the coverage per gallon on the label. Ready-to-use asphalt emulsion usually covers about 65 to 105 sq ft per gallon per coat, so a 500 sq ft driveway needs roughly 10 to 15 gallons for two coats, or 2 to 4 pails of 4.75 gallons.
How many square feet does a 5 gallon bucket of driveway sealer cover?
Typically 250 to 500 sq ft per coat, depending on the product and surface. Manufacturers list 400 to 500 sq ft per 4.75-gallon pail on smooth or previously sealed asphalt and 300 to 400 sq ft on rough or unsealed asphalt. Filler-type sealers can drop to about 250 sq ft.
Is one coat of sealer enough?
One coat is common for resealing a driveway in good condition, and some filler-sealers are labeled for one coat only. Two thin coats give better coverage and durability on worn or porous asphalt, and commercial specifications generally call for two coats.
How long should new asphalt cure before sealcoating?
Product labels ask for at least six months or a full summer season, and some ask for twelve months. If water beads up on the surface, the asphalt is not ready.
What temperature do you need to seal a driveway?
Most labels require ground and air temperatures of at least 50 to 55 °F and rising, with no rain expected for 24 to 48 hours. Some cold-weather formulas are rated down to 40 °F, and at least one heavy-duty emulsion requires 60 °F.
How often should you sealcoat a driveway?
About every two to three years is the usual guidance; one major sealer maker says every three years, sooner with heavy traffic or harsh winters. Sealing too often builds up excess sealer that can peel.
Is coal tar sealer banned?
In some places. Washington, Minnesota, New York and Maryland restrict the sale or use of coal tar sealant statewide, and many cities and counties have their own bans. Asphalt emulsion and acrylic sealers are the usual alternatives.
Sources
- Dalton Enterprises, Latex-ite asphalt emulsion driveway sealer data sheet (400–500 sq ft per 4.75 gal pail smooth, 300–400 rough; 55 °F and rising; 12-month cure), cold-weather formula data sheet (40 °F) and acrylic sealer data sheet (400/300/200 sq ft per 3.4 gal pail for two coats).
- Black Jack, heavy-duty asphalt emulsion sealer data sheet (CAS-73: 380 sq ft per 5 gal, 76 sq ft per gallon; 60–90 °F; 6 months or a full summer).
- Henry, HE200 driveway sealer data sheet (250–400 sq ft per 5 gal; 50 °F; 48 hours dry; 6 months).
- SealMaster, MasterSeal Concentrate specification (70–82 sq ft per gallon of mixed material per coat; two coats; 50 °F minimum) and FAQ (reseal about every 3 years).
- Quikrete, Asphalt Cold Patch data sheet (cure 30 days, preferably 90, before sealing).
- US Geological Survey, Fact Sheet 2011–3010 and Fact Sheet 2016–3017 on coal-tar-based sealcoat and PAHs.
- Minnesota Statutes section 116.202; Washington Department of Ecology, New Law Affects Coal Tar Sealants; New York Governor's Office, coal tar pavement product ban; Maryland Chapter 709 of 2022.
- Fixr, cost to seal an asphalt driveway ($0.88–$2.10 per sq ft, about $1.05 typical) and Inch Calculator, cost to seal an asphalt driveway (about $1.10 per sq ft average).
Last updated: October 2026 · How we calculate