How Much Asphalt Millings for a 18x45 Driveway?

A 18 by 45 foot driveway is 810 square feet. How much asphalt millings for a 18x45 driveway depends on depth: at 4 inches it is about 10.00 cubic yards or 13.0 tons. Suppliers usually sell by the ton, so the tonnage is the number to give them.

Volume and tonnage calculator →

The math for a 18x45 driveway

Area: 18 × 45 = 810 sq ft.
Depth in feet: 4 ÷ 12 = 0.333 ft.
Cubic feet: 810 × 0.333 = 270.0 cu ft.
Cubic yards: ÷ 27 = 10.00 yd³.
Tons: × 1.3 = 13.0 tons.

The volume and tonnage calculator does this for any size.

Asphalt millings needed by depth

Depth	Cubic yards	Tons (approx.)	Tons +10%
3 in	7.50	9.8	10.7
4 in	10.00	13.0	14.3
6 in	15.00	19.5	21.5

About asphalt millings

Asphalt millings are ground-up old pavement. When compacted and warmed by sun they bind into a fairly firm surface, which is why they are popular for rural drives and lots. Ask your supplier for their own tons-per-yard figure, since stone source and moisture shift it.

Preparing the driveway

Strip sod and soft topsoil, grade for drainage and compact the subgrade before any stone goes down. Gravel drives last longer with a compacted base layer under the top stone and a slight crown so water runs off. Since the driveway carries car and truck traffic, a little extra depth is cheap insurance.

Ordering tips

Round up. Compaction and uneven ground eat material. Adding about 10 percent is common.
Delivery size. 14.3 tons may take more than one typical dump truck load; small loads may carry a delivery fee. See how many tons of gravel in a dump truck.
Bulk vs bags. At this size bulk delivery is usually the practical choice.
Where it drops. Have the truck dump as close to the driveway as firm ground allows.

Where asphalt millings fits

Works well for:

Rural driveways and farm lanes
Parking areas where a dust-free surface is wanted
Low-cost base under a future paved surface

Less suited to:

Areas near wells or streams where local rules limit them
Decorative or barefoot areas
Jobs needing a uniform, clean look

Quick reference numbers

Per inch over 100 sq ft: about 0.40 tons of asphalt millings (0.31 cubic yards).
Per inch over 1,000 sq ft: about 4.0 tons.
Another size for comparison: a 20x25 area at 2 inches takes about 4.0 tons.
Weight used here: about 1.3 tons per cubic yard.

Where estimates go wrong

Mixing up cubic yards and tons. Yards are volume, tons are weight; convert with the product’s weight per yard.
Using inches as if they were feet. Depth has to be divided by 12 before you multiply; skipping that step inflates the order twelvefold.
Forgetting that compaction shrinks loose material. A loose 4-inch spread of a dense-graded stone may finish closer to 3 inches after rolling.
Ignoring the base. A thin surface layer over soft soil fails early no matter how much material is on top.

Questions people ask

How many tons of asphalt millings for a 18x45 driveway?

About 13.0 tons at 4 inches deep, or 14.3 tons with 10 percent extra.

How many cubic yards is a 18x45 driveway at 4 inches?

About 10.00 cubic yards.

How much does a cubic yard of asphalt millings weigh?

Usually around 1.2 to 1.4 loose tons, depending on stone size, fines and moisture.

How deep should asphalt millings be for a driveway?

The table above shows 3 to 6 inches. Shallower depths suit top dressing; deeper depths suit new installs and heavier use.

How many square feet is 18x45?

810 square feet.

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