How Much Asphalt for a 20 Space Parking Lot?
How much asphalt for a 20 space parking lot: about 118 tons at 3 inches thick, assuming roughly 325 square feet per space including drive aisles, or about 6,500 square feet total.
Asphalt tonnage calculator →Tons by thickness
| Asphalt thickness | Tons (at ~325 sq ft/space) |
|---|---|
| 2 in | 79 |
| 3 in | 118 |
| 4 in | 157 |
| 5 in | 196 |
Tons use about 145 lb per cubic foot of compacted hot mix. Use the asphalt calculator with your actual measured area for a firm number.
Related: How Much Asphalt for a 100 Space Parking Lot?
Layout changes the total
Stall size, aisle width, one-way vs two-way traffic, angled vs 90-degree parking, islands and the entrance all change the area per space. Tight lots may run under 300 square feet per stall; lots with landscaping and wide aisles run well over 350. See parking spaces per acre.
Section design
Light-duty lots commonly use a 2 to 3 inch surface on a compacted stone base; drive lanes and dumpster pads get heavier sections. Local code and soil conditions drive the final design. The asphalt base calculator sizes the stone layer.
Related: How Much Asphalt for a 30 Space Parking Lot?
Finishing the lot
Lots need a cross slope, often around 1 to 2 percent, toward inlets or the edge. Plan striping, wheel stops and ADA spaces before paving so the layout works.
Waste and yield
Hand work around islands, curbs and drains uses more material than machine paving across open areas. Many estimators add a few percent to the computed tons, then adjust with the paving crew based on the base grade.
Permits and planning
Before finalizing tons, confirm parking requirements, accessible space counts and drainage rules with the local jurisdiction. Stormwater rules in particular can change the layout or require inlets and detention.
Getting an accurate area
Once you have a site plan, measure the paved outline rather than relying on a per-space estimate. Include the entrance apron, drive lanes, loading zones and any dumpster pad. Subtract islands and planting areas that will not be paved.
Questions people ask
How many tons of asphalt for 20 parking spaces?
About 118 tons at 3 inches, assuming about 325 sq ft per space.
How many square feet is a 20-space parking lot?
Roughly 6,500 square feet including aisles.
How thick is parking lot asphalt?
Often 2 to 3 inches for car lots, more for heavy traffic, over a compacted stone base.
How many square feet per parking space?
About 300 to 350 square feet per stall including aisles.
Related guides
- Asphalt Parking Lot Cost: Build the Budget From Square Feet and Tons
- How Thick Is a Parking Lot Asphalt Overlay?
- Cross Slope for a Parking Lot
- How Many Parking Spaces Fit on an Acre of Asphalt?
- How Much Asphalt for a 10 Space Parking Lot?
- How Much Asphalt for a 15 Space Parking Lot?
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