Asphalt Calculator

Extra material covers small dips, settling, spillage, and measurements that are not perfectly square. The calculated amount remains visible so you can compare both figures.

Both are shown. “Calculated” bags cover the measured volume; “Order” bags include the 10% allowance and round partial bags up to whole bags.

Volume comes directly from your dimensions. Weight is a range because moisture, particle size, composition, and compaction change bulk density.

Multiply the area in square feet by the compacted thickness in inches, divide by 12 for cubic feet, then multiply by 145 lb/ft³ and divide by 2,000 for tons. As a shortcut, square feet × inches × 0.006 ≈ tons of dense-graded hot mix. A 20 × 30 ft driveway at 3 in is 600 sq ft × 0.25 ft = 150 cubic feet, about 10.9 tons, or 5.6 cubic yards. Add roughly 10% for waste and edges.

Asphalt pavement is about 92–96% aggregate — crushed stone, gravel, and sand graded from coarse down to fine dust — bound by 4–8% asphalt binder (bitumen), the heavy residue left at the bottom of the crude oil distillation column. Recycled asphalt pavement, polymers, fibers, and anti-strip additives are commonly blended in. The binder is the glue; the stone carries the load.

At a hot-mix plant, aggregate is dried and heated to roughly 300 °F (150 °C) in a rotating drum, then mixed with heated liquid binder in precise proportions and held in an insulated silo. It is trucked hot, laid by a paver at 250–300 °F, and compacted by steel-drum and pneumatic rollers before it cools below about 175 °F. Warm-mix asphalt uses additives or foaming to do the same work 30–100 °F cooler; cold mix uses an emulsion and needs no heat at all.

By production temperature, the three types are hot-mix asphalt (HMA), warm-mix asphalt (WMA), and cold-mix asphalt. HMA is the standard for driveways, roads, and parking lots. WMA is produced and placed 30–100 °F cooler, saving fuel and extending the paving season. Cold mix is an emulsion-based repair material used for potholes and patches in cold or wet conditions. Within hot mix, the common sub-types are dense-graded, open-graded (porous), and stone matrix asphalt (SMA).

Type 7 is a New York State DOT mix designation — a fine-graded top (wearing) course with small aggregate, usually placed 1–1.5 in thick to give a smooth, tight surface. It is a common specification for residential driveways and thin overlays in the Northeast. Mix type numbers are state-specific: a Type 7 in New York does not mean the same thing as a numbered mix in another state, so check the local DOT specification.

Recycled asphalt millings — crushed asphalt ground off an existing road — are the cheapest option, commonly $10–$30 per ton against $100–$200 per ton for hot mix, and roughly $1–$3 per square foot installed. Cold mix is next cheapest for small repairs. The trade-off is finish and lifespan: millings compact into a firm, dark surface but never bind like a hot mat, and they are best on driveways, lanes, and parking areas rather than a street.

Stone matrix asphalt (SMA) is the strongest common mix — a gap-graded blend where coarse stone carries load through direct stone-on-stone contact, held together by a fiber-stabilized, polymer-modified binder. It is used on highways and airport runways for rut resistance. For driveways and lots, a polymer-modified dense-graded hot mix laid full depth over a well-compacted base gives most of the benefit at a realistic price.

A residential driveway needs 2–3 in of compacted surface course over 4–8 in of compacted aggregate base, or 4–5 in of asphalt placed in two lifts for a full-depth driveway with no stone base. A car-only parking lot takes 3–4 in over 6–8 in of base; truck lanes and dumpster pads take 4–6 in over 8–12 in. An overlay over sound pavement is 1.5–2 in. Anything thinner than about 2 in cannot be compacted properly and cracks early.

Asphalt does not dry — it cools, and it cures. A new mat is firm enough for foot traffic in a few hours and for cars in 24–72 hours, longer in hot weather. It keeps hardening for 6–12 months as the lighter oils in the binder oxidize off, which is why you avoid parking in one spot, sharp steering-wheel turns while stopped, motorcycle kickstands, and heavy trailer jacks for the first month, and why sealcoating waits 6–12 months.

Yes, upfront. Asphalt paving runs about $3–$7 per square foot installed against $6–$12 for concrete, and it can be driven on in days rather than a week. Concrete lasts longer — 30–40 years against 15–30 — and needs less routine work, while asphalt needs sealcoating every 2–4 years and crack filling. Asphalt is also easier to resurface and better in freeze-thaw climates and where de-icing salt is used. The concrete calculator prices the other side of that comparison.

Material alone is roughly $1.80–$3.60 per square foot at 3 in compacted, working from $100–$200 per ton. Installed, expect $3–$7 per square foot for a new residential driveway, $2–$4 for an overlay on sound pavement, $7–$13 for a commercial lot with full base work, and $1–$3 for recycled millings. Small jobs sit at the top of every range because of plant minimums and mobilization.

Dense-graded hot mix is roughly $100–$200 per ton delivered, moving with crude oil prices, haul distance, and mix design. Recycled millings run $10–$30 per ton, and bagged cold patch is $10–$25 per 50 lb bag. Most plants set a minimum load of 1–3 tons or charge a short-load fee, so the first ton on a small job is always the most expensive one.

3-tab asphalt shingles last about 15–20 years; architectural or dimensional shingles last 25–30 years; premium designer shingles reach 30–50 years. Steep pitch, good attic ventilation, and a mild climate push a roof to the top of its range, while heat, hail, and poor ventilation cut it short. Note that shingles are a roofing product — the calculator above is for asphalt paving, measured by the ton, not by the square.

A properly built asphalt driveway lasts 15–30 years. What decides where in that range it lands is the base underneath, the compacted thickness, drainage at the edges, and maintenance: crack filling before winter and sealcoating every 2–4 years. A thin mat over a weak base can fail in under 10 years; 4 in over a well-compacted 8 in base, kept sealed, comfortably passes 25.

A typical 600 sq ft residential driveway (about 20 × 30 ft) costs roughly $1,800–$4,200 installed, and a longer 1,000 sq ft drive runs $3,000–$7,000. Removing old pavement adds $1–$3 per square foot, new aggregate base adds $1–$2, and a millings driveway lands at $600–$1,800 for that 600 sq ft drive. Resurfacing an existing driveway that still has a sound base costs about half of a full rebuild.

An asphalt shingle roof lasts 15–30 years depending on the shingle grade — about 15–20 for 3-tab, 25–30 for architectural — with manufacturer warranties often quoted longer than real-world service life. Ventilation, decking condition, and storm exposure matter more than the warranty. Asphalt paving, by contrast, is on a 15–30 year cycle with resurfacing at roughly the halfway point.

Wait 24–72 hours before driving on a newly paved driveway, and longer in hot weather — a fresh mat is still soft enough to scuff and rut. For the first 30 days, avoid parking in the same spot, turning the wheel while stopped, and point loads such as kickstands, jack stands, and trailer tongues. On a road, crews reopen a lane once the mat has cooled below about 140 °F, which is often within an hour or two of rolling.

Hot-mix asphalt leaves the plant at 275–325 °F (135–163 °C), is laid by the paver at 250–300 °F, and must be compacted before it drops below roughly 175–185 °F. Once in service, the story changes: a black asphalt surface in direct summer sun reaches 125–150 °F when the air is only 90 °F, which is hot enough to burn a dog’s paws and soften the surface under a parked tire.

Measure the area in square feet, decide the compacted thickness, and convert with square feet × inches × 0.006 ≈ tons — or use the calculator above, which does it for each mix type. Then price three things separately: the mix by the ton, the aggregate base by the ton or cubic yard, and the crew’s mobilization, which does not scale down for a small job. Add 5–10% to the tonnage for waste and edge wedges, and confirm the plant’s minimum load before ordering.

Work it in four lines. Tonnage: square feet × inches × 0.006, times $100–$200 per ton. Base: 4–8 in of compacted aggregate, priced with the crushed stone calculator. Removal and excavation: $1–$3 per square foot for tear-out of an existing surface. Labor and mobilization: the fixed cost of getting a paver, roller, and crew on site, which is why a 400 sq ft driveway rarely costs half of an 800 sq ft one. Cross-check the total against $3–$7 per square foot installed.

Roofing is measured in squares, where one square is 100 sq ft of roof surface. Take the building footprint, multiply by a pitch factor (about 1.05 for a 4/12 roof, 1.12 for 6/12, 1.20 for 8/12) to get the true sloped area, divide by 100 for squares, and add 10–15% for waste, hips, and valleys. Three bundles of standard shingles cover one square. This is a different calculation from the paving one above, which works in tons of mix.

At the dense-graded hot-mix benchmark of 145 lb/ft³ compacted, one ton covers about 80 sq ft at 2 in, 55 sq ft at 3 in, 41 sq ft at 4 in, and 27 sq ft at 6 in. In square yards, that is roughly 18 sq yd per ton at 1 in — the 110 lb per square yard per inch spread rate the paving trade quotes. Lighter mixes such as millings or porous asphalt cover more ground per ton.

Crushed asphalt — asphalt millings, recycled asphalt pavement, or RAP — is old pavement ground off a road and screened to size. Relaid and compacted, it makes a firm, dark, dust-free driveway or lane at a fraction of hot-mix cost, and residual binder helps it knit together in warm weather. Choose the millings option in the calculator above: compacted RAP is lighter than a hot mat, so the same area takes fewer tons.

Sealcoat every 2–4 years, starting 6–12 months after paving — sealing sooner traps the oils that still need to oxidize off and leaves a soft surface. Crack filling matters more than sealing: fill anything wider than about 1/4 in before freeze-thaw season, because water in a crack is what destroys the base. Sealcoating is cosmetic and protective, not structural, and it will not hold a failing pavement together.

Both. The calculator defaults to US customary units — square feet, inches, tons, and cubic yards — which is what American asphalt plants quote by, and the unit toggle switches the whole page to meters, centimeters, tonnes, and cubic meters. The density figures are printed in lb/yd³ either way so you can check them against a supplier’s own spread rate.