How it works
The calculator multiplies the driveway area by the number of coats, divides by the area one pail covers and rounds up to whole pails. Crack filler is counted separately from the length of the cracks.
Driveway area = Length × Width
Pails = ⌈ Driveway area × Coats × (1 + Extra ÷ 100) ÷ Coverage per pail ⌉
Crack filler = ⌈ Crack length ÷ Length per container ⌉
⌈ ⌉ means rounding up to the next whole number: you can’t buy part of a pail. In “known driveway area” mode the area you enter replaces length × width.
The worked example
A 40 × 12 ft driveway has 480 sq ft. Black Jack’s data sheet for Drive-Maxx 1000 gives 300 sq ft per 4.75 gallon pail per coat on rough or worn driveways and requires two coats, so the driveway takes 480 × 2 ÷ 300 = 3.2 pails – four pails to buy. If the blacktop is smooth, the sheet gives 350 sq ft per pail and the result is 960 ÷ 350 = 2.7, or three pails.
Rough or smooth blacktop
How far a pail goes depends on the driveway more than on the sealer. Coarse, worn, never-sealed asphalt is open and absorbs sealer; a smooth or previously sealed surface takes less. Both data sheets used here give two figures, and the “Blacktop surface” choice starts on rough, the more conservative option. Latex-ite adds that road-grade asphalt with larger aggregate can give lower than normal coverage – an extra allowance makes sense there.
Coats and pails
Sealer is applied in thin coats with a squeegee. Black Jack calls two uniform coats mandatory for Drive-Maxx 1000, applied at right angles; Latex-ite says thin coats are recommended because thick coats cause uneven coverage, tracking and curing problems. The pail count scales directly with the coats you enter. Both products come in 4.75 gallon pails – Black Jack lists the fill as 4.75 gal / 18 L – so the coverage figures are per pail, not per gallon.
Crack filler
Cracks are filled before sealing, and the filler must cure first. Black Jack’s Speed-Fill tube fills cracks up to 1 in wide and gives about 32 linear feet of a 1/4 in bead per 10 oz tube; wider or deeper cracks take more. Enter the total length of the cracks and the length one container fills to count containers.
Measurements are converted to one internal unit before calculating, so you can enter the driveway in feet or meters; in metric the coverage per pail is shown in m².
Worked example
Inputs
- Measure by
- Driveway length × width
- Driveway length
- 40 ft
- Driveway width
- 12 ft
- Number of coats
- 2
- Driveway sealer
- Black Jack Drive-Maxx 1000 (4.75 gal) – 300 sq ft rough, 350 smooth per pail per coat (≈ 27.9 / 32.5 m²)
- Blacktop surface
- Rough, worn or never sealed
- Extra sealer
- 0 %
- Crack filler per container
- 32 ft
Result
- Driveway area
- 480 sq ft
- Coverage per pail used
- 300 sq ft
- Pails of sealer
- 4
Common mistakes
- Using the smooth-surface coverage on an old, rough or never-sealed driveway. Both data sheets used here give about 300 sq ft per pail on rough blacktop against 350–400 on smooth or previously sealed blacktop.
- Putting on one thick coat to save time. Black Jack and Latex-ite both say thick coats lead to uneven coverage, tracking and curing problems; two thin coats are the norm on their sheets.
- Sealing over open cracks. The sealer doesn’t fill them; fill them first and let the filler cure.
- Mixing pails from different batches mid-driveway. Black Jack says to match the manufacturer’s codes and blend the end of one pail with the next.
- Forgetting the apron at the street, a walkway or a parking pad that is sealed at the same time.
Assumptions and limits
- The driveway is a rectangle of length × width, or the area you enter.
- Coverage per pail is the documented figure of the product you pick for the surface you choose – the low end of the range – or the figure you type, and it applies to every coat.
- Pails are rounded up to whole pails. Both products are sold in 4.75 gallon (18 L) pails.
- Crack filler is counted only when you enter the crack length, by dividing it by the length one container fills.
- Cleaning, oil-stain treatment and patching of potholes are not included.
Frequently asked questions
How many square feet does a 5 gallon pail of driveway sealer cover?
Driveway sealer pails usually hold 4.75 gallons. Black Jack gives 350 sq ft per pail per coat on smooth driveways and 300 on rough or worn ones for Drive-Maxx 1000. Latex-ite gives 400–500 sq ft per pail on smooth and previously sealed driveways and 300–400 on rough and unsealed ones for Airport Grade. The calculator uses the low end.
How many coats of driveway sealer do I need?
Follow the pail. Black Jack says two thin coats are mandatory for Drive-Maxx 1000, applied at right angles once the first has cured. Latex-ite recommends thin coats and a second coat 24 hours after the first where needed.
How much crack filler do I need?
Add up the length of the cracks and divide by the length one container fills, which is on its label and depends on the crack width. Black Jack’s Speed-Fill 10 oz tube, for example, fills about 32 linear feet as a 1/4 in bead.
Can I use this for a concrete driveway?
No. Asphalt driveway sealers are for blacktop; for concrete use the concrete sealer calculator with a concrete sealer’s coverage.
Sources
- Black Jack Drive-Maxx 1000 Premium Filler & Sealer (6455) – Technical Data Sheet — Gardner-Gibson (Black Jack). "Approximate Coverage Rate (per coat) for 4.75 gallon pail: 350 sq/ft on smooth driveways, 300 sq/ft. on rough/worn driveways"; fill level 4.75 gal / 18 L; 2 uniform coats required.
- Latex-ite Airport Grade Driveway Sealer (73066) – Technical Data Sheet (rev. 09/28/16) — Dalton Enterprises (Latex-ite). "Smooth & previously sealed driveways will average 400-500 square feet per one 4.75 gallon pail. Rough & unsealed surfaces will average 300-400 sq. ft." (preset: 400 smooth, 300 rough).
- Black Jack Speed-Fill Blacktop Filler (6439) – Technical Data Sheet — Gardner-Gibson (Black Jack). 10 fl oz (296 mL) tube: "Provides approx. 32 linear feet of 1/4" bead"; cracks and joints up to 1 in wide (US example default 32 ft per tube).
- NIST Handbook 44, Appendix C – General Tables of Units of Measurement — National Institute of Standards and Technology. Exact unit definitions: 1 in = 2.54 cm, 1 yd³ = 27 ft³, 1 US gal = 231 in³, 1 lb = 0.45359237 kg.
Method reviewed November 5, 2026