How much river rock do I need for a 10x10 area?

A 10×10 ft area at 3-inch depth: 10 × 10 × (3/12) ÷ 27 = 25/27 = 0.93 cubic yards ≈ 1 cubic yard. At a typical weight of 1.35 tons/cu yd, that's about 1.3 tons. Order 1 cubic yard (about 1.3–1.4 tons) to cover this area at 3-inch depth with a bit of excess.

How many bags of river rock do I need?

A standard 50-lb bag of river rock covers about 0.5 cubic feet (0.019 cubic yards) at 2-inch depth. For a 100 sq ft area at 2-inch depth: 100 × (2/12) = 16.7 cu ft ÷ 0.5 cu ft/bag = 33 bags. Bulk delivery becomes cheaper at approximately 1.5–2 cubic yards (about 80 bags).

How deep should river rock be for landscaping?

2–3 inches for decorative ground cover and mulch replacement. 3–4 inches for dry creek beds and drainage. 6–9 inches for playground safety compliance. Around trees and shrubs: 2–3 inches maximum — deeper rock traps heat and moisture in ways that can harm roots.

What is the difference between river rock and crushed stone?

River rock is naturally smooth and rounded from water erosion — decorative, doesn't compact well. Crushed stone is angular from quarrying — better for drainage, structural base, and pathways since it locks together when compacted. River rock is primarily decorative; crushed stone is more versatile structurally.

River Rock Calculator: How Much River Rock Do You Need?

Calculate cubic yards and tons of river rock needed for any landscaping project. Covers depth recommendations, weight conversions, and typical river rock costs in 2026.

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River Rock Coverage Formula

Cubic Yards = Length (ft) × Width (ft) × Depth (inches) ÷ 12 ÷ 27

Or equivalently: Cubic Yards = Length (ft) × Width (ft) × Depth (ft) ÷ 27

Tons = Cubic Yards × 1.35 (river rock is lighter than crushed stone)

Recommended Depths by Application

Application	Recommended Depth
Decorative mulch replacement	2–3 inches
Dry creek bed	3–4 inches
French drain	Fill full trench width
Erosion control on slopes	3–5 inches
Playground ground cover	6–9 inches (ASTM F1292 safety standard)
Around trees and shrubs	2–3 inches (no deeper — can harm roots)

Worked Example

A dry creek bed: 35 ft long × 4 ft wide × 4 inches deep: - Volume: 35 × 4 × (4/12) ÷ 27 = 35 × 4 × 0.333 ÷ 27 = 46.7 ÷ 27 = 1.73 cubic yards - Weight: 1.73 × 1.35 = 2.3 tons

A landscaping bed: 25 ft × 12 ft × 2.5 inches: - Volume: 25 × 12 × (2.5/12) ÷ 27 = 6.25 cu ft ÷ 27 = 0.23 cubic yards — very small, likely purchased in bags - Bags needed: 0.23 cu yd × 27 ÷ 0.5 (standard 50-lb bag covers ~0.5 cu ft) = ~13 bags

River Rock Sizes

Size Category	Diameter	Best Use
Pea gravel	3/8 in	Pathways, ground cover
Small river rock	1–2 in	Around plants, walkways
Medium river rock	2–4 in	Dry creek beds, drainage
Large river rock	4–8 in	Decorative focal points
Boulders	8 in+	Accent, erosion control

River Rock Cost (2026)

Purchase Method	Typical Price
Bulk (delivery, per cubic yard)	$45–$150
Per ton (bulk delivery)	$65–$200
Bagged (50 lb bag, 0.5 cu ft)	$4–$8 per bag
Bagged (large 0.5 cu yd bag)	$30–$65

Bulk is significantly cheaper for large projects. Above approximately 3 cubic yards (2 tons), bulk delivery beats bagged pricing even including delivery fees.

Weed Barrier Recommendation

For decorative river rock applications where weed prevention matters: - Install landscape fabric before placing rock - Use 3 oz or heavier woven weed barrier (non-woven fabric breaks down faster) - Overlap fabric sections by 6 inches - Do NOT use plastic sheeting — it prevents water from reaching plant roots and kills soil biology

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Frequently Asked Questions

How much river rock do I need for a 10x10 area?: A 10×10 ft area at 3-inch depth: 10 × 10 × (3/12) ÷ 27 = 25/27 = 0.93 cubic yards ≈ 1 cubic yard. At a typical weight of 1.35 tons/cu yd, that's about 1.3 tons. Order 1 cubic yard (about 1.3–1.4 tons) to cover this area at 3-inch depth with a bit of excess.
How many bags of river rock do I need?: A standard 50-lb bag of river rock covers about 0.5 cubic feet (0.019 cubic yards) at 2-inch depth. For a 100 sq ft area at 2-inch depth: 100 × (2/12) = 16.7 cu ft ÷ 0.5 cu ft/bag = 33 bags. Bulk delivery becomes cheaper at approximately 1.5–2 cubic yards (about 80 bags).
How deep should river rock be for landscaping?: 2–3 inches for decorative ground cover and mulch replacement. 3–4 inches for dry creek beds and drainage. 6–9 inches for playground safety compliance. Around trees and shrubs: 2–3 inches maximum — deeper rock traps heat and moisture in ways that can harm roots.
What is the difference between river rock and crushed stone?: River rock is naturally smooth and rounded from water erosion — decorative, doesn't compact well. Crushed stone is angular from quarrying — better for drainage, structural base, and pathways since it locks together when compacted. River rock is primarily decorative; crushed stone is more versatile structurally.

Last updated 7/28/2026