Asphalt Driveway Calculator — Tonnage, Base and Cost
Sized for residential work. Pick a standard driveway preset or enter your own dimensions, add a turning circle or apron as a second area, and get the asphalt tonnage, the aggregate base tonnage underneath it, and an installed cost.
Asphalt driveway calculator
Preset for residential work: it starts in imperial units at 3 inches, and the shape presets cover the common driveway layouts. Add a second area for a turning circle or a parking apron and it accumulates.
Standard driveway sizes
| Layout | Width | Length | Area | Tonnage at 3 in (+10%) |
|---|---|---|---|---|
| Single car, minimum | 10 ft | 20 ft | 200 sq ft | 4.0 t |
| Single car, comfortable | 12 ft | 25 ft | 300 sq ft | 6.0 t |
| Two cars side by side | 20 ft | 20 ft | 400 sq ft | 8.0 t |
| Two cars, standard | 20 ft | 30 ft | 600 sq ft | 12.0 t |
| Two cars + walkway | 24 ft | 30 ft | 720 sq ft | 14.4 t |
| Three cars | 30 ft | 30 ft | 900 sq ft | 18.0 t |
| Long suburban drive | 12 ft | 60 ft | 720 sq ft | 14.4 t |
| Rural drive | 12 ft | 150 ft | 1,800 sq ft | 35.9 t |
| Circular drive (outer 60 ft, inner 40 ft) | 10 ft ring | — | 1,571 sq ft | 31.3 t |
Planning guidance: allow 9–10 ft of depth per parked vehicle, 12 ft minimum width for a single lane, 20 ft for two vehicles abreast, and a 25 ft turning radius at any curve a car has to negotiate at walking pace.
How thick, and how many lifts
| Use | Compacted asphalt | Lifts | Base |
|---|---|---|---|
| Cars only, mild climate | 2–2.5" | 1 | 4–6" |
| Cars only, freeze-thaw climate | 3" | 1 | 6–8" |
| Occasional light truck | 3" | 1 or 2 | 8" |
| RV, boat trailer, work truck | 3–4" | 2 | 8–10" |
| Steep grade (over 10%) | 3" | 2 | 8" |
| Soft clay subgrade | 3" | 1 or 2 | 10–12" + geotextile |
Two lifts are better than one at the same total depth. A 3 inch pavement placed as 2 + 1.5 inches (loose) compacts far more uniformly than a single 3.5 inch loose pass, because roller energy does not reach the bottom of a thick mat. See the thickness guide for the aggregate-size rule behind this.
The base under the driveway
The stone base is where a driveway succeeds or fails, and it is usually a bigger tonnage than the asphalt.
| Subgrade | Base depth | Base tonnage per 1,000 sq ft | Notes |
|---|---|---|---|
| Well-drained sand or gravel | 4" | 17.5 t | Compact in one lift |
| Mixed loam | 6" | 26.3 t | Compact in two lifts |
| Silty clay | 8–10" | 35–44 t | Add separation geotextile |
| Heavy clay, poor drainage | 10–12" | 44–53 t | Geotextile essential; consider stabilisation |
| Organic soil | excavate and replace | — | No structure works over peat |
Compacted crushed stone runs about 105 lb/ft³, so a 6 inch base under a 600 sq ft driveway is roughly 16 tons of stone against 12 tons of asphalt. Budget for both.
Turning circles, aprons and irregular drives
Most real driveways are not one rectangle. Add an area per element:
| Element | Shape | Typical size | Area |
|---|---|---|---|
| Main run | Rectangle | 12 × 60 ft | 720 sq ft |
| Parking apron | Rectangle | 20 × 20 ft | 400 sq ft |
| Turning circle | Circle | 30 ft diameter | 707 sq ft |
| Half-circle turnaround | Half circle | 24 ft diameter | 226 sq ft |
| Flared road entrance | Trapezoid | 12 ft to 20 ft over 15 ft | 240 sq ft |
| Garage approach widening | Triangle | 8 ft base × 12 ft | 48 sq ft |
The road entrance flare is frequently forgotten and frequently the heaviest-loaded part of the whole driveway, because every delivery vehicle turns across it. Many municipalities have their own apron specification — check before you pour the base.
What a driveway costs
| Driveway | Area | Material only | Installed (2026) |
|---|---|---|---|
| Single car | 300 sq ft | $480 – $1,200 | $1,350 – $2,600 |
| Two car | 600 sq ft | $960 – $2,400 | $2,100 – $4,400 |
| Two car + apron | 1,000 sq ft | $1,600 – $4,000 | $3,200 – $7,000 |
| Long suburban | 1,440 sq ft | $2,300 – $5,700 | $4,600 – $9,500 |
| Rural, 150 ft | 1,800 sq ft | $2,900 – $7,200 | $5,400 – $11,700 |
| Circular | 1,571 sq ft | $2,500 – $6,300 | $5,000 – $10,500 |
Detailed line-item breakdown in the driveway paving cost guide.
Installation timeline
| Day | Work | Notes |
|---|---|---|
| Day 1 morning | Demolition and excavation | Old surface out, cut to subgrade level |
| Day 1 afternoon | Grade and proof-roll subgrade | Soft spots found and remediated now |
| Day 2 | Place and compact aggregate base | Two lifts if over 6 inches |
| Day 2 or 3 | Base settles / cures | Some contractors allow traffic on the base for a week |
| Day 3 | Prime coat, then asphalt lifts | Both lifts on the same day where possible |
| Day 3 | Compaction and edge work | Rolling continues until the mat cools |
| Day 4–5 | Cure before use | Cars after 24–48 hours |
| Month 6–12 | First seal coat | Not before six months |
Caring for a new driveway
- First 48 hours: no vehicles. The mat is still cooling and takes an impression easily.
- First 30 days: avoid turning the wheel while stationary, avoid parking in exactly the same spot every day, and keep motorcycle and trailer jack stands off it or put a plywood square underneath.
- First summer: the surface will soften on hot afternoons. This is normal and it re-hardens overnight.
- Edges: unsupported asphalt edges crumble. Back-fill against them with soil or stone within the first few weeks, or install an edge restraint.
- Drainage: keep the low edge clear so water leaves. Standing water at the edge is the most common cause of premature edge failure.
- Fuel and oil spills: clean promptly. Petroleum products dissolve the binder.
- Snow removal: plastic-edged blades or rubber-shod plough edges. A steel blade dropped hard on new asphalt gouges it.
Frequently asked questions
How much asphalt do I need for a driveway?
A standard two-car driveway of 600 sq ft at 3 inches needs about 12 tons including a 10% buffer. A single-car drive of 300 sq ft at the same depth needs about 6 tons.
What is a standard driveway size?
Single car: 10–12 ft wide. Two cars side by side: 20–24 ft. Length varies, but 9–10 ft of parking depth per vehicle plus turning space is the usual planning figure. A 20 × 30 ft rectangle is the most common two-car layout.
How thick should a driveway be?
2–3 inches of compacted asphalt for cars over 4–8 inches of crushed stone. 3–4 inches in two lifts if you park an RV, boat or work truck.
How much does an asphalt driveway cost?
$3–$7 per square foot installed in 2026, so $1,800–$4,200 for a 600 sq ft two-car driveway. See the driveway cost guide.
How long before I can drive on a new asphalt driveway?
24 to 48 hours for cars. Wait 3–5 days before parking heavy vehicles, and avoid turning the steering wheel while stationary for the first few weeks — that is what causes the scuff marks people complain about.
When should I seal a new driveway?
6 to 12 months after installation, not sooner. New asphalt needs time for the lighter fractions of the binder to cure off. Sealing too early traps them and softens the surface. After the first seal, every 3–5 years is typical.
Can I pave over an existing driveway?
Yes, if the existing surface is structurally sound — no alligator cracking, no settlement, adequate drainage. A 1.5–2 inch overlay costs roughly half of a full reconstruction. If the base has failed, the overlay will reflect the cracking within two years.
What slope does a driveway need?
A minimum of 1% fall away from the house, 2% preferred. Never pitch water toward a foundation or a garage door. On steep sites, a level landing at the garage of at least 10 ft is worth designing in.
Sources and further reading
Related calculators and guides
Thickness guide
How deep and how many lifts.
Asphalt vs concrete
Which material for your driveway.
Cost calculator
Full installed cost.
Tonnage calculator
Material quantity only.