Asphalt Calculator
Asphalt paving requires precise material estimates to bid and order correctly. This asphalt calculator gives you cubic yards, tons, and cubic feet based on your project's length, width, and thickness — using a standard hot-mix asphalt density of 2.025 tons per cubic yard.
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Formula
Volume (cu yd) = L × W × (T/12) / 27; Tons = cu yd × 2.025
Length and width in feet, thickness in inches converted to feet. Dividing by 27 converts cubic feet to cubic yards. The average hot-mix asphalt density is approximately 2.025 tons per cubic yard (145 lbs per cubic foot).
How to use the Asphalt Calculator
- 1
Enter your length (ft)
Value should be in ft.
- 2
Enter your width (ft)
Value should be in ft.
- 3
Enter your thickness (in)
Value should be in in.
- 4
Read your results instantly
Results update in real time as you type.
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Asphalt Thickness Guidelines
Standard residential driveway asphalt is 2–3 inches of compacted hot-mix over a 4–6 inch compacted stone base. Commercial parking lots typically use 3–4 inches of asphalt. Roads require 4–6 inches or more depending on traffic load. Always install asphalt over a properly compacted aggregate base — asphalt laid over soft or unstable ground will fail quickly regardless of thickness.
Asphalt vs. Concrete Driveways
Asphalt driveways cost less upfront ($3–$7 per sq ft installed vs. $5–$10 for concrete) but require more maintenance — sealing every 3–5 years and potential resurfacing after 15–20 years. Concrete lasts longer (25–50 years) with less maintenance but costs more and is harder to repair. In cold climates, asphalt handles freeze-thaw cycles better than concrete. In hot climates, asphalt can soften and rut in extreme heat.
Tips & Insights
Seal Within the First Year
Apply a coal tar or asphalt-based sealcoat 6–12 months after installation. Sealing before the asphalt fully cures can trap gases and cause bubbling; waiting too long allows oxidation and UV damage to begin.
Prepare the Base First
The aggregate base is as important as the asphalt itself. A 4–6 inch layer of compacted #21A or crusher run gravel prevents settling, cracking, and pothole formation. Never skip or cheap out on the base.
Compact While Hot
Asphalt must be compacted with a roller immediately after laying while it's still hot (above 175°F). Cold asphalt doesn't compact properly, leaving voids that cause premature deterioration.
Worked Examples
Residential Driveway
17.78 cubic yards — approximately 36 tons of hot-mix asphalt for a standard two-car driveway.
Small Parking Lot
74.07 cubic yards — about 150 tons of asphalt for a compact parking area.
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Frequently Asked Questions
How many tons of asphalt do I need per square foot?
At 3-inch thickness, one square foot of asphalt requires approximately 0.05 tons. At 4 inches, about 0.066 tons per square foot. A 1,000-sq-ft driveway at 3 inches needs roughly 50 tons.
How long does an asphalt driveway last?
With proper installation and regular sealing, an asphalt driveway lasts 20–30 years. Regular crack repair and sealcoating every 3–5 years extends lifespan significantly.
Can I pave over an existing asphalt driveway?
Yes, if the existing asphalt is structurally sound with no major cracking or base failure. Mill or grind the surface first if adding more than 1.5 inches, to avoid raising drain levels and door thresholds.
What is the best time of year to pave?
Spring through fall (when ambient temperatures are above 50°F) is ideal. Hot-mix asphalt must be laid and compacted above 175°F — cold weather causes it to cool too quickly, preventing proper compaction.
How much does an asphalt driveway cost?
Residential asphalt driveways typically cost $3–$7 per square foot installed, including base preparation. A 600-sq-ft driveway runs $1,800–$4,200 depending on region and current asphalt prices.
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