How much rock per square foot?

At 2 in deep, about 15–17 lb per sq ft.

How deep should landscape rock be?

1½–2 in to hide the base fully.

For more than a ton, bulk is usually cheaper.

Which landscape rock stays clean longest?

Mid-tone grays and tans hide dirt better than white.

Rock or mulch in beds?

Rock doesn't break down; mulch feeds the soil and holds moisture.

Decorative stone calculator

Area, depth and bag size: you get the weight of decorative stone, river rock or marble chips and the number of bags to buy.

Purchase quantity

1.033 yd³

Net measurement: 0.981 yd³ · Waste 5 %

Bags of decorative stone62 bag
Stone weight1.345 ton

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How it's calculated (visible formula)

weight = area × depth × (1 + waste) × density; bags = ceil(weight ÷ bag weight)

Net geometric measurement, no waste.
Adjustable waste % for cuts and breakage.
Purchase rounded up to sellable units (boxes, bags, buckets, boards).

See methodology and formula versions

How to calculate it, step by step

Measure the bed or decorative area.
Pick a depth: 1½–2 in to hide the base.
Work out the volume and add 5% waste.
Convert to weight with the stone's density.
Divide by bag weight, or order a bulk bag over a ton.

Worked example: 160 sq ft bed with 2 in of river rock

160 sq ft × 2 in ≈ 1 yd³ with waste
≈ 2,700 lb (1,220 kg)
÷ 44 lb bags = 62

→ About 62 bags of 44 lb.

Common mistakes

A single layer of stone over soil shows the dirt below.
Forgetting weed fabric.
Using very fine white stone in walkways — it stains.

Pro tips

Always lay weed fabric first — without it weeds appear within weeks.
Light stone reflects heat; avoid it beside sun-sensitive plants.
Rinse dusty stone before spreading.
Use edging to separate rock from lawn.

From calculation to quote

Add labor, overhead and your margin, and generate the professional PDF.

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FAQs

How much rock per square foot?: At 2 in deep, about 15–17 lb per sq ft.
How deep should landscape rock be?: 1½–2 in to hide the base fully.
Bags or bulk?: For more than a ton, bulk is usually cheaper.
Which landscape rock stays clean longest?: Mid-tone grays and tans hide dirt better than white.
How many pounds of rock per square foot?: About 15–17 lb at 2 in deep.
Rock or mulch in beds?: Rock doesn't break down; mulch feeds the soil and holds moisture.

Sources and standards

Maintained by Srikanta M · Formula v1.0.0 · Verified 2026-09-10 · Updated 2026-09-10 · Limits: quantity estimation, not structural design or site supervision.