How to Estimate Driveway Sealer Quantity
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Gallons = area × coats ÷ label coverage per gallon per coat. Divide by the pail size and round up. Use the low end of the label's range for rough or aged asphalt.
Sealer quantity is simple arithmetic once you have the right coverage figure — and that figure comes from your product, not a generic rule.
Run the numbers with the Driveway Sealing Calculator.
Worked example
The driveway is 60 × 12 ft = 720 sq ft. At 70 sq ft/gal: 1,440 ÷ 70 = 20.57 gal → 20.57 ÷ 4.75 = 4.33 → 5 pails. The coverage range in the caption is an example; read your own label.
Example label coverage 70–90 sq ft/gal; 4.75-gal pails
| Coverage used | Gallons (720 sq ft, 2 coats) | Pails |
|---|---|---|
| 70 sq ft/gal | 20.6 | 5 |
| 80 sq ft/gal | 18.0 | 4 |
| 90 sq ft/gal | 16.0 | 4 |
Common mistakes
- Using the best-case coverage on porous asphalt
- Forgetting the apron and parking pad
- Ignoring cure-temperature instructions on the label
Product type matters
Asphalt-emulsion, acrylic and coal-tar sealers have different coverage rates. USGS research identifies coal-tar-based sealcoat as a major source of PAH contamination, and several jurisdictions restrict it — check local rules.
Assumptions and limitations
Coverage is assumed constant per coat. Crack filler and patch material are separate quantities.