How Much Crushed Stone for a 24x40 Parking Pad?

How much crushed stone for a 24x40 parking pad: at 4 inches deep you need about 11.85 cubic yards, which is roughly 16.6 tons at 1.4 tons per yard. The parking pad covers 960 square feet, so every inch of depth adds about 2.96 yards.

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The math for a 24x40 parking pad

Area: 24 × 40 = 960 sq ft.
Depth in feet: 4 ÷ 12 = 0.333 ft.
Cubic feet: 960 × 0.333 = 320.0 cu ft.
Cubic yards: ÷ 27 = 11.85 yd³.
Tons: × 1.4 = 16.6 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	5.93	8.3	9.1
3 in	8.89	12.4	13.7
4 in	11.85	16.6	18.3
6 in	17.78	24.9	27.4

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. Ask your supplier for their own tons-per-yard figure, since stone source and moisture shift it.

Preparing the parking pad

Dig out organic soil, compact the subgrade and set an edge so the stone does not migrate onto the lawn. A pad that holds parked weight for long periods benefits from a dense base under the surface stone. This parking pad sees parked vehicles, 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. 18.3 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 parking pad as firm ground allows.

Where crushed stone fits

Works well for:

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

Think twice for:

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 12x24 area at 2 inches takes about 2.5 tons.
Weight used here: about 1.4 tons per cubic yard.

Common estimating mistakes

Using inches as if they were feet. Depth has to be divided by 12 before you multiply; skipping that step inflates the order twelvefold.
Ordering exactly the math. Uneven ground and spillage nearly always need a little more than the flat calculation.
Measuring only the main rectangle. Aprons, turnouts and curved edges add real square footage.
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 crushed stone for a 24x40 parking pad?

About 16.6 tons at 4 inches deep, or 18.3 tons with 10 percent extra.

How many cubic yards is a 24x40 parking pad at 4 inches?

About 11.85 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 parking pad?

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 24x40?

960 square feet.

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