How Much Crusher Run for a 18x40 Parking Pad?

How much crusher run for a 18x40 parking pad is a quick volume problem. 720 square feet at 4 inches comes to 8.89 cubic yards. Crusher run usually weighs about 1.5 to 1.7 compacted tons per cubic yard, so plan on roughly 13.8 tons.

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The math for a 18x40 parking pad

Area: 18 × 40 = 720 sq ft.
Depth in feet: 4 ÷ 12 = 0.333 ft.
Cubic feet: 720 × 0.333 = 240.0 cu ft.
Cubic yards: ÷ 27 = 8.89 yd³.
Tons: × 1.55 = 13.8 tons.

The volume and tonnage calculator does this for any size.

Crusher run needed by depth

Depth	Cubic yards	Tons (approx.)	Tons +10%
3 in	6.67	10.3	11.4
4 in	8.89	13.8	15.2
6 in	13.33	20.7	22.7
8 in	17.78	27.6	30.3

About crusher run

The fines in crusher run fill the gaps between stones, so it weighs more per yard than clean stone once compacted. Plan on rolling or plate-compacting it in lifts. Weight per yard is a planning number; the scale ticket at the yard is the real one.

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. For parked vehicles, 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. 15.2 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 parking pad as firm ground allows.

Where crusher run fits

Best suited to:

Base under asphalt, pavers or concrete
Gravel drives that need a firm, packed surface
Shed pads and equipment pads

Think twice for:

Drainage layers, since the fines slow water
Decorative beds
Spots where you want water to soak straight through

Quick reference numbers

Per inch over 100 sq ft: about 0.48 tons of crusher run (0.31 cubic yards).
Per inch over 1,000 sq ft: about 4.8 tons.
Another size for comparison: a 14x28 area at 2 inches takes about 3.8 tons.
Weight used here: about 1.55 tons per cubic yard.

Mistakes that throw off the order

Assuming every supplier uses the same weight. Two yards selling the same product name can quote different tons per yard.
Using inches as if they were feet. Depth has to be divided by 12 before you multiply; skipping that step inflates the order twelvefold.
Skipping drainage. Water sitting under any surface softens the base and leads to ruts and potholes.
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 crusher run for a 18x40 parking pad?

About 13.8 tons at 4 inches deep, or 15.2 tons with 10 percent extra.

How many cubic yards is a 18x40 parking pad at 4 inches?

About 8.89 cubic yards.

How much does a cubic yard of crusher run weigh?

Usually around 1.5 to 1.7 compacted tons, depending on stone size, fines and moisture.

How deep should crusher run be for a parking pad?

The table above shows 3 to 8 inches. Shallower depths suit top dressing; deeper depths suit new installs and heavier use.

How many square feet is 18x40?

720 square feet.

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