Asphalt Calculator
Calculate how much asphalt you need in tons and cubic yards for driveways, parking lots, and overlays. Based on 145 lbs/cu ft density.
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How to Use This Calculator
- Enter the length and width in feet.
- Enter the depth in inches (typical: 2–4 inches for driveways).
- Results show square footage, cubic yards, and tons needed.
Formula
Volume (cu ft) = Length × Width × (Depth ÷ 12)
Cubic yards = Volume ÷ 27 | Tons = Volume × 145 ÷ 2000
Example
Example: 20 ft × 50 ft, 3 inch depth → 250 cu ft → 9.26 yd³ → 18.1 tons.
Frequently Asked Questions
- Use the formula: Tons = Length (ft) × Width (ft) × Depth (in) ÷ 12 × 145 lbs/cu ft ÷ 2000. This converts length and width to cubic feet (depth must be converted from inches to feet first by dividing by 12), multiplies by the density of hot mix asphalt (approximately 145 lbs per cubic foot), and then divides by 2000 to get short tons. For example, a 20 × 50 ft driveway at 3 inches deep: 20 × 50 × (3÷12) × 145 ÷ 2000 = 18.1 tons. This calculator handles the full conversion automatically.
- Residential driveways for passenger vehicles typically need 2–3 inches of compacted hot mix asphalt over a 4–6 inch compacted gravel base. A total pavement structure of 6–9 inches (gravel base + asphalt) is sufficient for most homes. Driveways serving heavy vehicles — delivery trucks, RVs, trailers — should have 3–4 inches of asphalt over a 6–8 inch base. Commercial parking lots typically require 4 inches of asphalt. The compacted base is critical: asphalt will crack and sink quickly over an unstable or poorly compacted sub-base regardless of asphalt thickness.
- At a density of 145 lbs per cubic foot, one cubic yard (27 cubic feet) of hot mix asphalt weighs 27 × 145 = 3,915 lbs = 1.96 tons. So one ton of asphalt covers approximately 0.51 cubic yards. Asphalt density can range from 140–150 lbs/cu ft depending on the aggregate type and mix design, with dense-graded mixes being heavier. Some suppliers quote coverage in square yards per ton at a given compacted depth — for a 2-inch layer, one ton covers about 80–85 sq ft.
- Hot mix asphalt (HMA) is produced at 250–325°F at an asphalt plant and must be laid and compacted immediately while hot. It is the standard material for new driveways, parking lots, and road surfaces, providing a durable long-lasting finish when properly installed. Cold patch (cold mix asphalt) is a pre-mixed product available in bags or buckets that can be applied at ambient temperatures for pothole repairs and utility cut patches. Cold patch is slower to cure and less durable than hot mix, but it is convenient for small repairs when a hot mix plant is not accessible.
- Asphalt is applied in loose form and then compacted by a roller, which reduces the thickness by approximately 20–25%. This means if you want a final compacted depth of 3 inches, you must apply about 3.75–4 inches of loose asphalt before rolling. The compaction factor depends on the mix type, aggregate size, and roller type. This calculator can optionally add a compaction factor to the tonnage estimate, since the volume (and thus tons) needed is based on the loose pre-compacted depth. Always confirm the compaction factor with your asphalt supplier for the specific mix being used.