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Work out asphalt tonnage for a driveway, car park or road. Enter the finished compacted thickness and this gives you the tons to order, the loose depth to spread so the paver is set correctly, plus truckloads, tack coat and cost.
Estimate from your inputs. Confirm mix density and layer thickness with your paving contractor or specification.
To calculate asphalt, multiply area in square feet × compacted thickness in feet, then multiply by 145 lb/ft³ and divide by 2,000 for US tons. A 12 × 50 ft driveway at 2 in needs about 7.3 tons. One ton covers roughly 80 ft² at 2 in. Spread loose at about 25% above the finished depth — 2″ compacted needs 2½″ loose.
Asphalt is estimated by weight, not volume — and always on the compacted in-place volume, which is where it differs from aggregate.
Tonnage is calculated on the compacted volume, not the loose volume. This is the opposite of aggregate, where you order loose material by volume. Asphalt is bought by weight from the plant, and the weight you need is fixed by the finished in-place volume — compaction changes the depth you spread, not the tonnage you buy.
Why this matters on site. Set the paver screed to the finished thickness and the layer rolls down to roughly three quarters of the specified depth. Every asphalt calculator online gives you tonnage; almost none tell you the loose depth to actually spread, which is the number the paving crew needs.
Worked example — a 12 × 50 ft driveway, 2 in surface course. Area = 600 ft². Compacted volume = 600 × 0.1667 = 100 ft³. At 145 lb/ft³ that is 14,500 lb = 7.25 tons, or 7.66 tons with 5% waste. Spread depth = 2 × 1.25 = 2½ inches loose. Tack coat at 0.10 gal/yd² = 600÷9 × 0.10 = 6.7 gallons. One truckload.
Real paving jobs with tonnage and truckloads, at the stated compacted thickness. Figures are before any waste allowance.
| # | Project | Mix | Area | Thickness | Surface | Tons | Loads |
|---|---|---|---|---|---|---|---|
| 1 | Residential driveway | Surface course | 12 × 50 ft | 2″ | 600 ft² | 7.25 t | 1 |
| 2 | Long driveway | Surface course | 12 × 120 ft | 2″ | 1,440 ft² | 17.39 t | 1 |
| 3 | Wide driveway | Surface course | 20 × 60 ft | 2.5″ | 1,200 ft² | 18.12 t | 1 |
| 4 | Driveway overlay | Surface course | 14 × 45 ft | 1.5″ | 630 ft² | 5.71 t | 1 |
| 5 | Parking pad | Surface course | 20 × 20 ft | 2″ | 400 ft² | 4.83 t | 1 |
| 6 | Small car park | Binder course | 40 × 60 ft | 3″ | 2,400 ft² | 44.11 t | 3 |
| 7 | Medium car park | Binder course | 60 × 100 ft | 3″ | 6,000 ft² | 110.26 t | 6 |
| 8 | Large car park | Base course | 100 × 150 ft | 4″ | 15,000 ft² | 374.57 t | 18 |
| 9 | Retail lot | Base course | 120 × 200 ft | 4″ | 24,000 ft² | 599.31 t | 28 |
| 10 | Truck yard | Base course | 80 × 120 ft | 6″ | 9,600 ft² | 359.59 t | 17 |
| 11 | Private road | Base course | 20 × 500 ft | 4″ | 10,000 ft² | 249.71 t | 12 |
| 12 | Rural lane | Base course | 16 × 800 ft | 4″ | 12,800 ft² | 319.63 t | 15 |
| 13 | Access road | Binder course | 18 × 300 ft | 3″ | 5,400 ft² | 99.24 t | 5 |
| 14 | Farm track | Cold mix / patch | 12 × 400 ft | 3″ | 4,800 ft² | 80.91 t | 4 |
| 15 | Walking path | Surface course | 6 × 200 ft | 2″ | 1,200 ft² | 14.50 t | 1 |
| 16 | Cycle path | Surface course | 10 × 500 ft | 2″ | 5,000 ft² | 60.40 t | 3 |
| 17 | Basketball court | Surface course | 50 × 84 ft | 2″ | 4,200 ft² | 50.74 t | 3 |
| 18 | Tennis court | Surface course | 60 × 120 ft | 2″ | 7,200 ft² | 86.97 t | 4 |
| 19 | Playground surface | Porous asphalt | 40 × 60 ft | 3″ | 2,400 ft² | 38.39 t | 2 |
| 20 | School yard | Surface course | 80 × 100 ft | 2.5″ | 8,000 ft² | 120.80 t | 6 |
| 21 | Pothole repair | Cold mix / patch | 3 × 3 ft | 3″ | 9 ft² | 0.15 t | 1 |
| 22 | Trench reinstatement | Base course | 3 × 80 ft | 4″ | 240 ft² | 5.99 t | 1 |
| 23 | Speed bump area | Surface course | 20 × 10 ft | 3″ | 200 ft² | 3.62 t | 1 |
| 24 | Bus stop pad | Base course | 12 × 40 ft | 5″ | 480 ft² | 14.98 t | 1 |
| 25 | Loading dock | Base course | 40 × 60 ft | 6″ | 2,400 ft² | 89.90 t | 5 |
| 26 | Fuel station forecourt | SMA | 60 × 80 ft | 4″ | 4,800 ft² | 122.36 t | 6 |
| 27 | Airport apron section | Base course | 100 × 200 ft | 6″ | 20,000 ft² | 749.14 t | 35 |
| 28 | Recycled overlay | Recycled (RAP) | 20 × 200 ft | 2″ | 4,000 ft² | 46.61 t | 3 |
| 29 | Driveway (metric) | Surface course | 3.5 × 15 m | 50 mm | 565 ft² | 6.72 t | 1 |
| 30 | Car park (metric) | Binder course | 20 × 30 m | 80 mm | 6,458 ft² | 124.61 t | 6 |
Truckloads assume a 22-ton tri-axle. Thicknesses are finished compacted depths — spread roughly 25% deeper loose.
Asphalt is bought by weight. This is the figure you give the supplier, and what the delivery ticket will show.
The loose depth to set the paver or screed to, so the layer finishes at your specified thickness after rolling.
Hot mix cools in transit and must be laid hot, so loads need to arrive steadily rather than all at once.
Square feet per ton at your thickness. Around 80 ft² per ton at 2 inches is the industry rule of thumb.
Part loads often carry a surcharge, and a short second load is disproportionately expensive. Trimming an area slightly can save a whole delivery.
Mix designs vary between plants and regions. A quick call gets you the actual figure rather than a generic 145.
An overlay without tack coat is two separate layers, not one pavement. It's cheap and it's what stops slippage cracking.
Hot mix needs a dry surface and ground temperature above roughly 50 °F. Cold or wet conditions mean poor compaction and early failure.
The layer rolls down about 25%, so you end up with 1½ inches where you specified 2. Spread loose, then compact.
Anything under about 1½ inches can't compact properly and ravels quickly. Thin does not mean cheap in the long run.
Fresh asphalt over a failed base cracks in the same places within a year or two. Fix the base first.
Porous asphalt and SMA differ by nearly 20%. On a large job that's several tons out.
Each swatch shows the typical aggregate texture for that mix, with its density and where it's used.
| Mix | lb/ft³ | kg/m³ | ft² per ton @2″ | tons per 1,000 ft² @2″ | Typical use |
|---|---|---|---|---|---|
| Porous / permeable | 128 | 2,050 | 94 | 10.7 | Car parks, SUDS, drainage surfaces |
| Cold mix / patching | 135 | 2,160 | 89 | 11.3 | Pothole repair, temporary work |
| Recycled (RAP) | 140 | 2,240 | 86 | 11.7 | Overlays, base layers, low-cost paving |
| Blacktop | 140 | 2,240 | 86 | 11.7 | General residential paving |
| Surface course (wearing) | 145 | 2,322 | 83 | 12.1 | Top layer — driveways, roads, car parks |
| Binder / intermediate | 147 | 2,355 | 82 | 12.3 | Layer beneath the surface course |
| Base course | 150 | 2,400 | 80 | 12.5 | Structural lower layer, heavy traffic |
| Stone mastic (SMA) | 153 | 2,450 | 78 | 12.8 | High-stress surfaces, forecourts, junctions |
Compacted in-place densities for estimating. Actual mix design density varies by plant, aggregate source and binder content — ask your supplier for their figure on anything large.
| Application | Surface | Binder / base | Aggregate base | Notes |
|---|---|---|---|---|
| Footpath / cycle path | 1½–2 in | — | 4 in | Light foot and cycle traffic only |
| Resurfacing overlay | 1½–2 in | — | existing | Only over a sound base — tack coat essential |
| Residential driveway | 2 in | — | 6–8 in | Single course over compacted stone |
| Heavy-use driveway | 2 in | 2 in | 8 in | For RVs, boats or frequent heavy vehicles |
| Car park (cars only) | 2 in | 2 in | 8 in | Total 4 in asphalt over base |
| Car park (with lorries) | 2 in | 3–4 in | 10–12 in | Thicker where delivery vehicles turn |
| Private road | 2 in | 3 in | 10 in | Crown or fall for drainage |
| Public road | 2 in | 4–6 in | 12 in | DOT specification governs |
| Loading dock / truck yard | 2 in | 4–6 in | 12+ in | Consider concrete at dock faces |
| Tennis / basketball court | 1½–2 in | 2 in | 6 in | Tight tolerance — laser screed for flatness |
Most pavements are built in courses — base, binder, then surface — each with its own mix and thickness. Add each layer for a combined tonnage over the same area, using the area from the calculator above.
| Vehicle | Typical load | Covers @2″ | Notes |
|---|---|---|---|
| Small tipper | 5–8 tons | 400–650 ft² | Tight access, small driveways, patching |
| 10-ton truck | 10 tons | ~830 ft² | Typical residential driveway delivery |
| 16-ton truck | 16 tons | ~1,330 ft² | Larger driveways and small car parks |
| Tri-axle dump | 20–22 tons | ~1,800 ft² | The standard paving delivery vehicle |
| Semi trailer | 25 tons | ~2,080 ft² | Highway and large commercial work |
Asphalt concrete is a composite of mineral aggregate bound together with bitumen, a viscous petroleum product. By weight it is roughly 95 percent aggregate and 5 percent binder, which means asphalt is mostly crushed stone held together by a black glue. That ratio explains most of its behaviour: the aggregate provides strength and the binder provides flexibility and waterproofing.
It is called asphalt in North America, tarmac or bitmac colloquially in Britain and Ireland, and blacktop in casual use everywhere. The materials are essentially the same. True tarmacadam — aggregate bound with coal tar — has not been in general use for decades, though the word stuck.
Asphalt is also the most recycled material in the world by tonnage. Old pavement is milled off, crushed, and blended back into new mix, which is why recycled asphalt pavement appears as its own mix type on this page.
Hot mix asphalt is produced at around 300 °F and must be laid and compacted while still hot. It is the standard for driveways, roads and any permanent paving, and it gives the best durability and finish. The constraint is the temperature window: it has to get from plant to paver and be rolled before it cools below roughly 185 °F.
Warm mix asphalt uses additives or foaming to produce workable mix at 30 to 50 °F lower, which cuts fuel use and emissions, extends the haul distance, and lengthens the paving season into cooler weather. Performance is comparable to hot mix and it has become mainstream on larger contracts.
Cold mix uses emulsified binder and stays workable at ambient temperature. It is a repair material — pothole patching, temporary reinstatement, remote work where a plant is too far away. It is not a substitute for hot mix on a driveway, however convenient the bagged product looks.
Surface course, also called the wearing course, is the top layer you drive on. It uses smaller aggregate for a smooth, dense, weather-tight finish. Binder course sits beneath it with slightly larger aggregate, providing most of the load spreading. Base course is the structural bottom layer with the largest aggregate, used where traffic is heavy.
Stone mastic asphalt is a gap-graded mix with a high proportion of coarse aggregate in a rich binder mortar, giving excellent rut resistance. It costs more and is used where stress is concentrated — junctions, roundabouts, forecourts, bus stops. Porous asphalt is deliberately open-graded so water drains through it into a reservoir below, used for sustainable drainage. It is noticeably lighter than dense mixes because of the void space.
Standard hot mix asphalt has a compacted density of about 145 pounds per cubic foot, or 2,322 kilograms per cubic metre. That figure is the basis of nearly every asphalt estimate, and it is where the familiar rule of thumb comes from: one ton covers roughly 80 square feet at two inches thick.
Mix type moves this meaningfully. Base course runs nearer 150 pounds per cubic foot, stone mastic 153, while porous asphalt drops to around 128 because of its designed void space — a spread of nearly 20 percent from lightest to heaviest. Using a single generic density across mixes, as most calculators do, introduces error that grows with the size of the job. Some calculators default to 2,400 kg/m³ and describe it as conservative, which is another way of saying it over-estimates on most residential work.
The important structural point is that tonnage is calculated on the compacted in-place volume. Asphalt is bought by weight from the plant, and that weight is determined by the finished pavement, not by how bulky the material is coming off the truck.
Hot mix arrives loose and is rolled to its final density, losing roughly 20 to 30 percent of its depth in the process. A layer spread at two and a half inches finishes at about two inches after compaction.
This is why the paver screed is set above the specified thickness. Set it to the finished depth and the pavement comes out a quarter thinner than the drawing calls for, which matters both structurally and contractually. The spread depth panel on this page gives that loose figure directly, which is the number the paving crew actually needs and which almost no online calculator provides.
Compaction has to happen while the mix is hot. Rolling patterns typically use a breakdown roller immediately behind the paver, an intermediate roller, and a finish roller to remove marks. Once the mix cools below roughly 185 °F, further rolling achieves nothing and can damage the surface.
A pavement is a layered system in which each course spreads load onto the one below, so that by the time the load reaches the natural soil it is diffuse enough for the ground to carry. From the top: surface course, binder course, base course, then a compacted aggregate sub-base, then the prepared subgrade.
Domestic driveways compress this to a single asphalt course over aggregate. Highways use all of it. The principle is the same either way, and it explains why simply adding asphalt thickness is an inefficient way to strengthen a pavement — the sub-base and subgrade do most of the work.
A residential driveway typically takes two inches of surface course over six to eight inches of compacted aggregate. Two inches is a practical minimum for a driveway surface: thinner layers cannot compact properly, cool too fast to roll well, and ravel early.
Car parks for cars generally use four inches of asphalt in two courses over eight inches of base. Anywhere lorries turn or park needs more — six inches of asphalt over ten to twelve inches of base is common, and concrete is often better at dock faces and bin stores where point loads are static. Public roads follow the local transport department specification, typically six to eight inches of asphalt in multiple courses over twelve inches of sub-base.
Most asphalt failures are base failures. Cracking, potholes, rutting and depressions usually indicate that something below the asphalt is moving, not that the asphalt itself was inadequate. Fresh surfacing laid over a failed base reproduces the same cracks within a year or two.
Good practice is to excavate to the required depth, remove soft or organic material, proof-roll the subgrade to find weak spots, lay geotextile separation fabric, then place and compact aggregate in four to six inch lifts. Fixing a base costs more than surfacing it, and is the difference between a pavement lasting five years and twenty.
Water is the enemy of every pavement. It softens the subgrade, strips binder from aggregate, and expands in freeze-thaw cycles to break the surface apart. Every asphalt surface therefore needs positive drainage — a minimum fall of about 1 to 2 percent, either a crown down both sides or a single cross fall to a channel or gully.
Ponding is the visible warning sign. Standing water on a new pavement means the falls are wrong, and it will become a pothole. Where surface drainage is not achievable, porous asphalt over a storage layer is a legitimate alternative and increasingly used for sustainable drainage compliance.
A tack coat is a light spray of bitumen emulsion applied between asphalt layers, or between old and new pavement, to bond them into a single structure. Typical rates are 0.05 to 0.15 gallons per square yard depending on surface texture and condition. It is cheap, quick, and skipping it is a common cause of slippage cracking where a new overlay slides on the old surface.
A prime coat serves a similar function between an unbound aggregate base and the first asphalt layer, penetrating the base surface and binding the top of it. Not every specification calls for one, but where the base is dusty or the first layer is thin it makes a measurable difference.
The usual build is two inches of compacted surface course over six to eight inches of compacted aggregate, with geotextile beneath. Edges should be supported — either by a haunched shoulder of compacted stone, a concrete edging, or a kerb — because unsupported asphalt edges crack and crumble under wheel loads.
New asphalt takes time to cure fully. It is drivable within a day or so but stays soft for weeks in warm weather, so avoid parking on stands, turning wheels while stationary, and placing heavy static loads early on. Sealcoating, where used, is normally applied several months after laying rather than immediately.
Design car parks around where the load actually is. Parking bays for cars are lightly loaded and can be thinner; aisles, entrances and delivery routes carry every vehicle that uses the site and need the full section. Bin collection routes and delivery bays are frequently the first areas to fail because they were paved to bay specification.
Falls matter more here than anywhere, because a large flat area with poor drainage ponds everywhere. Plan the gullies first, then set the levels to suit them.
Public road construction is governed by transport department specifications covering mix design, layer thicknesses, compaction targets and testing regimes. Layers are placed and compacted in sequence, with density verified by nuclear gauge or core sampling against a percentage of laboratory maximum density.
For this kind of work a calculator is a preliminary quantity check only. The governing specification, the pavement design and the engineer's requirements take precedence over any general figure on this page.
An overlay — one and a half to two inches of new surface course over the existing pavement — is far cheaper than reconstruction and works well when the base is sound and the existing surface is simply worn. It requires a tack coat, and often milling at edges and around gullies so levels stay correct.
It does not work over a failed base. If there is alligator cracking, rutting, or areas that move underfoot, the problem is below and an overlay will crack through within a couple of years. Milling and inlaying the affected areas, or full-depth reconstruction, is the honest answer even though it costs more.
Reclaimed asphalt pavement is milled from existing roads, crushed and screened, and blended into new mix. It reduces both virgin aggregate and binder demand, and modern mixes commonly incorporate substantial proportions of it without performance loss. Its density sits slightly below virgin hot mix at around 140 pounds per cubic foot.
Loose RAP is also sold as a low-cost surfacing for tracks and rural driveways, where it is spread and compacted without heating. It performs better than gravel and worse than hot mix, and it is a reasonable middle option where budget is the constraint.
Give the plant your tonnage, the mix specification, and the delivery window. Because hot mix cools, scheduling matters more than for any other material: loads should arrive as the crew is ready to lay them, not stockpiled on site. Confirm the plant's actual mix density if the job is large enough for the difference to matter.
Weather governs the schedule. Hot mix wants a dry surface and ground temperature above roughly 50 °F. Paving in cold or wet conditions compromises compaction, and a pavement that was not compacted properly cannot be fixed afterwards.
Sealing cracks early is the single most cost-effective maintenance action, because open cracks admit water to the base. Fill anything wider than about a quarter inch. Potholes should be cut back to sound material, squared, tacked and filled with hot mix where possible — cold mix is a temporary measure.
Sealcoating protects the surface from oxidation and fuel spills and is typically reapplied every few years, though its value is debated and it does nothing structural. Kept drained, crack-sealed and free of standing water, a well-built asphalt pavement lasts fifteen to twenty-five years before it needs resurfacing.
Asphalt mix design, testing and construction are covered by established standards and guidance, with the Asphalt Institute and the National Asphalt Pavement Association publishing practice guides, AASHTO and ASTM setting test methods and material specifications, and state transport departments issuing binding requirements for public work. Federal Highway Administration guidance covers design and performance.
For domestic paving these matter mostly as shared vocabulary and as the source of the density and thickness figures used here. For any public, commercial or inspected work, the governing specification applies and this calculator is an estimating aid rather than a design tool.