How Much Driveway Sealer Do I Need?
Divide the driveway's square footage by the sealer's coverage per gallon, then multiply by the number of coats. With about 100 square feet per gallon for a sprayed coat on smooth asphalt, a 1,000 sq ft driveway needs about 10 gallons per coat, or two 5-gallon pails. Worn or porous pavement takes about 25–70% more.
The formula
gallons = length (ft) × width (ft) ÷ coverage (ft² per gallon) × coats
Round up to a whole gallon, then to pails. The coverage figure is the one that matters most, and it depends on your product, how it's mixed, how you apply it and how thirsty the pavement is. Use the number on your pail's label when you have it.
Gallons and pails by driveway size
| Area | Smooth (100 ft²/gal) | Average (80) | Rough (60) |
|---|---|---|---|
| 400 ft² | 4 gal / 1 | 5 gal / 1 | 7 gal / 2 |
| 600 ft² | 6 gal / 2 | 8 gal / 2 | 10 gal / 2 |
| 800 ft² | 8 gal / 2 | 10 gal / 2 | 14 gal / 3 |
| 1,000 ft² | 10 gal / 2 | 13 gal / 3 | 17 gal / 4 |
| 1,500 ft² | 15 gal / 3 | 19 gal / 4 | 25 gal / 5 |
| 2,000 ft² | 20 gal / 4 | 25 gal / 5 | 34 gal / 7 |
For two coats, double the gallons: a 1,000 sq ft driveway on average pavement takes 25 gallons, or 5 pails. Applying by squeegee or brush, use about 75 square feet per gallon on smooth pavement: 14 gallons for one coat on that same 1,000 square feet.
Step by step
- Measure the area. Length × width for a rectangle. Split an L-shape or a turnaround into rectangles and add them.
- Judge the surface. Smooth or recently sealed asphalt takes the least. Gray, gritty or cracked pavement that hasn't been sealed in years soaks up much more.
- Read the coverage on your product. Labels give a range; use the low end for rough pavement. If your sealer is a concentrate, check whether the figure is per gallon of concentrate or of mixed sealer.
- Pick the number of coats. Two is the usual recommendation, and almost always needed on worn pavement.
- Divide and multiply: area ÷ coverage × coats. 1,000 ÷ 80 × 2 = 25 gallons.
- Round up to pails: 25 ÷ 5 = 5 pails.
Common mistakes
- Using the best-case coverage. The top of a label's range assumes smooth pavement and a thin, even coat.
- Forgetting the second coat. Most of the protection, and most of the cost, is in coat two.
- Mixing up pail sizes. Many retail pails hold 4.75 gallons, not 5. On a big job, that's an extra pail.
- Skipping crack filling. Sealer doesn't fill cracks. Fill them first, or the sealer just runs into them.
Coverage figures here are planning assumptions: 100 ft² per gallon sprayed on smooth asphalt, lower for squeegee and worn surfaces. Your sealer's label and the pavement in front of you decide the real number.
Questions
How much sealer for a 1,000 square foot driveway?
About 10 gallons for one sprayed coat on smooth asphalt, 13 on average pavement and 17 on rough or porous pavement. Two coats double it: 20 to 34 gallons, or 4 to 7 five-gallon pails.
Do I need one coat or two?
Two coats wear better, and SealMaster recommends two coats of its mixed sealer for best results. Rough, porous or long-neglected asphalt soaks up the first coat, so it almost always needs a second.
Does squeegee or spray use more sealer?
In this calculator, squeegee or brush assumes 75 square feet per gallon against 100 for spray, because hand application works more material into the surface. Your product's label is the better guide.
Should I buy extra?
Buy enough for the full job plus a little. Running out halfway leaves a visible line where the second batch starts.