How Much River Rock for 1,000 Square Feet?

How much river rock for 1,000 square feet depends on depth. At 3 inches you need about 9.26 cubic yards, roughly 12.5 tons at 1.35 tons per yard. Going to 4 inches raises it to 16.7 tons.

Volume and tonnage calculator →

River rock for 1,000 sq ft by depth

Depth	Cubic yards	Tons	Tons +10%
2 in	6.17	8.3	9.2
3 in	9.26	12.5	13.8
4 in	12.35	16.7	18.3

Working it out

1,000 sq ft × (3 ÷ 12) ft = 250.0 cubic feet.
÷ 27 = 9.26 cubic yards.
× 1.35 tons per yard = 12.5 tons.

About river rock

River rock is smooth, water-worn stone sold in sizes from about 3/4 inch to several inches. Larger sizes cover fewer square feet per ton at the same depth because the voids between stones are bigger. Typical weight: 1.25 to 1.45 tons per cubic yard.

Before the truck comes

Measure odd shapes in pieces. Split curves and L-shapes into rectangles and add them.
Add a margin. About 10 percent covers compaction and low spots.
Bulk or bags. Bulk delivery is the practical choice here.
Prep first. Remove sod, compact the subgrade and set edging before the stone arrives.

Use the volume and tonnage calculator for any other size.

Where river rock fits

Works well for:

Dry creek beds and drainage swales
Decorative borders and planting beds
Around downspouts to stop splash erosion

Less suited to:

Walking surfaces
Driveways
Bases under slabs or pavers

Quick reference numbers

Per inch over 100 sq ft: about 0.42 tons of river rock (0.31 cubic yards).
Per inch over 1,000 sq ft: about 4.2 tons.
Another size for comparison: a 20x25 area at 2 inches takes about 4.2 tons.
Weight used here: about 1.35 tons per cubic yard.

Common estimating mistakes

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.
Skipping drainage. Water sitting under any surface softens the base and leads to ruts and potholes.
Measuring only the main rectangle. Aprons, turnouts and curved edges add real square footage.

Questions people ask

How many tons of river rock for 1,000 square feet?

About 12.5 tons at 3 inches deep.

How many cubic yards of river rock for 1,000 square feet?

About 9.26 yards at 3 inches.

How much river rock for 1,000 square feet at 2 inches?

About 8.3 tons, or 6.17 cubic yards.

How much does a yard of river rock weigh?

About 1.25 to 1.45 tons.

Should I add extra?

Yes, about 10 percent is a common allowance.

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