How Much Asphalt Millings for a 20x70 Driveway?

A 20 by 70 foot driveway is 1,400 square feet. How much asphalt millings for a 20x70 driveway depends on depth: at 4 inches it is about 17.28 cubic yards or 22.5 tons. Suppliers usually sell by the ton, so the tonnage is the number to give them.

Volume and tonnage calculator →

The math for a 20x70 driveway

Area: 20 × 70 = 1,400 sq ft.
Depth in feet: 4 ÷ 12 = 0.333 ft.
Cubic feet: 1,400 × 0.333 = 466.7 cu ft.
Cubic yards: ÷ 27 = 17.28 yd³.
Tons: × 1.3 = 22.5 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	12.96	16.9	18.5
4 in	17.28	22.5	24.7
6 in	25.93	33.7	37.1

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. Weight per yard is a planning number; the scale ticket at the yard is the real one.

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. 24.7 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

Think twice 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 15x30 area at 4 inches takes about 7.2 tons.
Weight used here: about 1.3 tons per cubic yard.

Mistakes that throw off the order

Mixing up cubic yards and tons. Yards are volume, tons are weight; convert with the product’s weight per yard.
Ordering exactly the math. Uneven ground and spillage nearly always need a little more than the flat calculation.
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.

Questions people ask

How many tons of asphalt millings for a 20x70 driveway?

About 22.5 tons at 4 inches deep, or 24.7 tons with 10 percent extra.

How many cubic yards is a 20x70 driveway at 4 inches?

About 17.28 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 20x70?

1,400 square feet.

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