Calculation details
Planning estimate only. Verify dimensions, waste, coverage, product specifications, and local requirements before purchasing materials.
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Use this result
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What does this calculator estimate?
A 20 x 10 foot driveway compacted 2 inches deep holds about 33.3 cubic feet of asphalt, roughly 2.4 tons at 145 pounds per cubic foot, or about 2.5 tons with 5 percent waste. Tons = length x width x depth in feet x density / 2,000 x (1 + waste).
- Compacted asphalt density runs about 145 pounds per cubic foot.
- Depth must be the compacted depth, which is thinner than the loose depth.
- Ordering 5-10 percent waste covers compaction loss and edges (NIST).
How asphalt quantities are estimated
Asphalt is sold by the ton, so driveway estimates convert the paved volume to weight using the material's density (~145 lb/ft³ for compacted asphalt). The estimate covers the paving layer only — base gravel is separate.
Limitations to watch for
The estimate assumes a uniform thickness and typical density; compaction, mix design, and surface irregularities shift real quantities. Order ~10% extra for waste and edge trimming. The tool doesn't include base layers or labor.
How to use it in practice
Measure the area and decide the layer thickness (2–3 inches is typical for driveways). Compute the tons, add 10%, and use it to get quotes — suppliers price per ton delivered.
['Enter the length and width.', 'Enter the thickness in inches.', 'The tool computes tons and suggests adding waste.']
How asphalt is measured
Asphalt is sold by the ton; volume = length × width × depth ÷ 27 cubic yards, then × density (about 2 tons per cubic yard). A 10×20-foot driveway at 3 inches is 1.85 yards ≈ 3.7 tons. The calculator converts dimensions into tons and cost.
Depth by use
Driveways typically get 2–3 inches of surface over 4–6 inches of base; walkways 1.5–2 inches; commercial lots 3–4 inches. The depth input drives the tonnage more than the area.
Density and compaction
Compacted asphalt weighs roughly 2 tons per cubic yard; loose material can weigh less before compaction. Ordering 5–10 percent extra covers compaction and waste. The calculator applies a standard density with an adjustable factor.
A worked example
A 12×30-foot driveway at 3 inches: 12×30×0.25 = 90 cu ft = 3.33 yards ≈ 6.7 tons. At $120 per ton, the material runs about $800 before base and labor. The calculator returns tons and cost.
The full paving budget
Asphalt material is part of the cost: base preparation, grading, and paving labor often exceed the material. The calculator gives the tonnage; the quote comparison uses the full installed price per ton.
How this calculator works
Formula
Volume = length × width × thickness. Tons = volume (ft³) × density (≈145 lb/ft³) ÷ 2,000. The tool converts thickness to feet and reports tons needed.
Worked example
A 100 ft² driveway at 2 inches: volume ≈ 16.7 ft³, weight ≈ 1.2 tons of asphalt.
Assumptions to verify
- Compacted asphalt density ≈ 145 lb/ft³.
- Uniform thickness across the area.
- Base layers and compaction testing are separate.
Frequently asked questions
How do I estimate asphalt?
Volume = length × width × thickness; tons = volume × 145 lb/ft³ ÷ 2,000. A 100 ft² driveway at 2" needs about 1.2 tons.
How thick should a driveway be?
2–3 inches of asphalt over a compacted base is typical for residential driveways.
How much asphalt is a ton?
A ton covers roughly 80 ft² at 2 inches thick — the tool computes your exact number.
Should I order extra?
Yes — add about 10% for waste, trimming, and compaction differences.
Does this include the base layer?
No — the estimate is for the asphalt surface only. Gravel base is priced separately.
What is asphalt density?
Compacted asphalt weighs about 145 lb per cubic foot — the tool uses this standard figure.
Can I estimate in metric?
The tool works in feet and inches; for metric, convert measurements first.
How much asphalt do I need?
Length × width × depth ÷ 27 = cubic yards; × ~2 tons/yard for tonnage.
How deep should asphalt be?
2–3 inches for driveways over a 4–6-inch base.
How much does a yard of asphalt weigh?
About 2 tons when compacted.
Cite this tool
BoringToolsKit. “Asphalt Calculator.” boringtoolskit.com/asphalt-calculator/ (reviewed 2026-08-25). Free to reference in articles, syllabi, and answer posts with a link.
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