One Asphalt Estimator
Asphalt is sold by the ton but laid by the square foot. Enter the area and the compacted depth and get the tonnage to order — plus the reverse check nobody else shows: how many square feet one ton actually covers at your depth.
Depth is the compacted thickness, not the loose depth in the truck. A 4-in lift is usually placed as two 2-in courses. Most pavers round orders up to the nearest half ton — and a half-ton short on a Saturday costs far more than a half-ton extra.
Tip: dimensions accept tape-measure entries — try 6' 8 5/16" or 6.5.
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How it works
Volume first: area × compacted depth gives cubic feet, and cubic yards is that ÷ 27. Weight is where asphalt differs from gravel and soil: compacted hot mix runs about 145 lb per cubic foot, so tons = cubic feet × 145 ÷ 2,000. That works out to roughly 0.054 tons per sq ft per inch of depth — the paver's rule of thumb. The coverage line inverts the same math: at 4 in deep, one ton paves about 41 sq ft; at 2 in, about 83. If a quote claims far better coverage, the mat is thinner than promised.
Formula & worked example
Formula: Tons = (length × width × compacted depth in inches ÷ 12) × density ÷ 2,000, with hot-mix density at 145 lb per cu ft (about 0.054 tons per sq ft per inch of depth). Coverage per ton = 2,000 ÷ density × 12 ÷ depth.
Worked example: A 20 × 12 ft driveway at 4 in compacted: 240 sq ft × 4 in = 80 cu ft; 80 × 145 ÷ 2,000 = 5.80 tons, and one ton covers about 41 sq ft at that depth.
When to use this
- You are ordering hot mix for a driveway, pad or small lot and the plant sells by the ton.
- A paving quote claims generous coverage — you want the coverage-per-ton check before signing.
- You are comparing asphalt against concrete or pavers for the same footprint.
How to use it, step by step
- Measure the area in feet: length × width (add aprons and turnarounds).
- Pick the compacted depth for the job — 3 in residential, 4 in on new base.
- Leave density at 145 unless your plant specifies its mix.
- Read tons to order, then check the coverage-per-ton line against any quote.
What the inputs mean
| Input | What it is | Typical values |
|---|---|---|
| Length & width | The paved area in feet | 12 × 20 ft single drive; 20 × 20 two-car |
| Compacted depth | Finished thickness after rolling, not loose depth | 2 in overlay; 3–4 in new work; 6 in commercial |
| Mix density | Compacted hot-mix weight per cubic foot | 145 lb/ft³ standard; 140–150 normal band |
Another worked example
A contractor overlay: 16 × 40 ft at 3 in compacted. Area 640 sq ft, volume 160 cu ft (5.93 cu yd), weight 160 × 145 ÷ 2,000 = 11.60 tons — and at 3 in, one ton covers about 55 sq ft, so any quote promising the job in 9 tons is quietly planning a thinner mat.
Frequently asked questions
How many tons of asphalt do I need for a 20 × 12 ft driveway?
At 4 in compacted depth: 240 sq ft × 4 in = 80 cu ft, and 80 × 145 ÷ 2,000 = 5.80 tons. At 3 in the same drive takes 4.35 tons. Order 6 tons to be safe — plants sell in half-ton steps and the last strip is no place to run short.
How much area does 1 ton of asphalt cover?
It depends entirely on depth: about 83 sq ft at 2 in, 55 at 3 in, 41 at 4 in and 28 at 6 in, at the standard 145 lb/ft³ density. Anyone quoting coverage without a depth is quoting half a number.
Why is the depth "compacted"?
Loose hot mix fluffs up roughly 20–25% over its finished thickness; the roller squeezes it down. Ordering by loose depth overbuys by about a quarter. Contracts and this estimator both work in compacted inches.
Asphalt or concrete for a driveway?
Asphalt material is cheaper per square foot and can be driven on in days; concrete costs more up front, lasts longer between resurfacings and shrugs off fuel spills. The Driveway Cost Estimator prices both — installed — side by side.
How thick should a residential driveway be?
Three inches of asphalt over a solid compacted base suits cars and light trucks. Go to 4 in for heavy pickups, RVs or soft soil, and 2 in only for an overlay on sound existing pavement.
💲 What will the installed driveway cost?
Tonnage is the material question. The Driveway Cost Estimator prices the whole job — asphalt, concrete, gravel or pavers, tear-out included if you need it.
What is the difference between asphalt and blacktop?
Almost none in residential speech — blacktop is asphalt concrete with a slightly different aggregate emphasis in some regions. Plants quote and sell both by the ton at the same densities used here.
How long before I can drive on new asphalt?
Light foot traffic immediately, cars after 24–72 hours depending on temperature, and avoid sharp power-steering turns for the first weeks while the mat cures to full hardness.