How Much Asphalt Millings for a 18x100 Driveway?

How much asphalt millings for a 18x100 driveway is a quick volume problem. 1,800 square feet at 4 inches comes to 22.22 cubic yards. Asphalt millings usually weighs about 1.2 to 1.4 loose tons per cubic yard, so plan on roughly 28.9 tons.

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The math for a 18x100 driveway

Area: 18 × 100 = 1,800 sq ft.
Depth in feet: 4 ÷ 12 = 0.333 ft.
Cubic feet: 1,800 × 0.333 = 600.0 cu ft.
Cubic yards: ÷ 27 = 22.22 yd³.
Tons: × 1.3 = 28.9 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	16.67	21.7	23.8
4 in	22.22	28.9	31.8
6 in	33.33	43.3	47.7

About asphalt millings

Millings vary by source: some loads are fine and uniform, others carry chunks. Ask the supplier for a screened product if you want a smoother finish, and check local rules, since some areas restrict their use near water. If the yard sells by the cubic yard instead of the ton, use the cubic-yard column directly.

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. For car and truck traffic, the depths in the table above are a reasonable starting range.

Ordering tips

Round up. Compaction and uneven ground eat material. Adding about 10 percent is common.
Delivery size. 31.8 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

Good uses:

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 4 inches takes about 8.0 tons.
Weight used here: about 1.3 tons per cubic yard.

Common estimating mistakes

Forgetting that compaction shrinks loose material. A loose 4-inch spread of a dense-graded stone may finish closer to 3 inches after rolling.
Ordering exactly the math. Uneven ground and spillage nearly always need a little more than the flat calculation.
Skipping drainage. Water sitting under any surface softens the base and leads to ruts and potholes.
Using inches as if they were feet. Depth has to be divided by 12 before you multiply; skipping that step inflates the order twelvefold.

Questions people ask

How many tons of asphalt millings for a 18x100 driveway?

About 28.9 tons at 4 inches deep, or 31.8 tons with 10 percent extra.

How many cubic yards is a 18x100 driveway at 4 inches?

About 22.22 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 18x100?

1,800 square feet.

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