How Much Asphalt Millings for a 12x100 Driveway?

How much asphalt millings for a 12x100 driveway is a quick volume problem. 1,200 square feet at 4 inches comes to 14.81 cubic yards. Asphalt millings usually weighs about 1.2 to 1.4 loose tons per cubic yard, so plan on roughly 19.3 tons.

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The math for a 12x100 driveway

Area: 12 × 100 = 1,200 sq ft.
Depth in feet: 4 ÷ 12 = 0.333 ft.
Cubic feet: 1,200 × 0.333 = 400.0 cu ft.
Cubic yards: ÷ 27 = 14.81 yd³.
Tons: × 1.3 = 19.3 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	11.11	14.4	15.9
4 in	14.81	19.3	21.2
6 in	22.22	28.9	31.8

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. 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. 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. 21.2 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.

Good and poor uses for asphalt millings

Good uses:

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

Poor fit for:

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 8x16 area at 4 inches takes about 2.1 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.
Assuming every supplier uses the same weight. Two yards selling the same product name can quote different tons per yard.
Ordering exactly the math. Uneven ground and spillage nearly always need a little more than the flat calculation.
Forgetting that compaction shrinks loose material. A loose 4-inch spread of a dense-graded stone may finish closer to 3 inches after rolling.

Questions people ask

How many tons of asphalt millings for a 12x100 driveway?

About 19.3 tons at 4 inches deep, or 21.2 tons with 10 percent extra.

How many cubic yards is a 12x100 driveway at 4 inches?

About 14.81 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 12x100?

1,200 square feet.

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