How Much Crushed Stone for a 12x100 Driveway?

A 12 by 100 foot driveway is 1,200 square feet. How much crushed stone for a 12x100 driveway depends on depth: at 4 inches it is about 14.81 cubic yards or 20.7 tons. Suppliers usually sell by the ton, so the tonnage is the number to give them.

Volume and tonnage calculator →

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: × 1.4 = 20.7 tons.

The volume and tonnage calculator does this for any size.

Crushed stone needed by depth

Depth	Cubic yards	Tons (approx.)	Tons +10%
2 in	7.41	10.4	11.4
3 in	11.11	15.6	17.1
4 in	14.81	20.7	22.8
6 in	22.22	31.1	34.2

About crushed stone

Crushed stone has fractured faces, so the pieces interlock when compacted. That is why it holds a driveway or pad shape better than round stone of the same size. 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. This driveway sees car and truck traffic, so match the depth to that load rather than to the minimum.

Ordering tips

Round up. Compaction and uneven ground eat material. Adding about 10 percent is common.
Delivery size. 22.8 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.

When to choose crushed stone

Works well for:

Driveway top courses and parking pads
Shed and hot tub bases
Backfill behind walls when a clean size is used

Less suited to:

Barefoot areas, since angular stone is rough
Play areas
Places that need a smooth rolling surface for wheels

Quick reference numbers

Per inch over 100 sq ft: about 0.43 tons of crushed stone (0.31 cubic yards).
Per inch over 1,000 sq ft: about 4.3 tons.
Another size for comparison: a 15x30 area at 3 inches takes about 5.8 tons.
Weight used here: about 1.4 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.
Using inches as if they were feet. Depth has to be divided by 12 before you multiply; skipping that step inflates the order twelvefold.
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.

Questions people ask

How many tons of crushed stone for a 12x100 driveway?

About 20.7 tons at 4 inches deep, or 22.8 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 crushed stone weigh?

Usually around 1.35 to 1.5 tons, depending on stone size, fines and moisture.

How deep should crushed stone be for a driveway?

The table above shows 2 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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