Material calculator
River Rock calculator
Enter your area and depth to get river rock in tons, cubic yards, bulk bags and delivered cost. River Rock is placed at about 100 lb per cubic foot, or 1.35 tons per cubic yard.
Your project
River Rock for dry creek beds, borders and decorative ground cover is typically placed 3" deep.
Crews typically order 5-10% extra to cover compaction, spillage and uneven subgrade.
River Rock required
6.3
US tons (incl. 5% waste)
- Area
- 480 sq ft
- Volume
- 4.67 cu yd
- Volume (cubic feet)
- 126
- Tons per cubic yard
- 1.35
- Bulk bags (1 ton each)
- 7
- Dump truck loads
- 1
- Delivered material cost
- $523
Smooth 1-3" stone placed over landscape fabric; it displaces easily so keep it out of traffic areas.
How much river rock do you need?
Volume first, weight second. Multiply area in square feet by depth in feet, divide by 27 for cubic yards, then multiply by 1.35 to convert to tons — that is the placed density of river rock at roughly 100 lb per cubic foot.
For dry creek beds, borders and decorative ground cover, 3 inches is the standard depth. Going shallower to save on material is a false economy: thin layers rut, migrate and expose the subgrade within a season.
Smooth 1-3" stone placed over landscape fabric; it displaces easily so keep it out of traffic areas.
Ordering and delivery
Yards sell river rock by the ton but stockpile it by the yard, so quote both numbers when you call. A standard tandem dump truck carries about 15 tons; anything under a ton usually comes in bulk bags at a significant premium per ton.
Delivered pricing runs $45 – $120 per ton depending on haul distance from the quarry. Freight, not the stone itself, is usually the larger half of that number.
River Rock coverage per ton
At 100 lb per cubic foot placed.
| Depth | Coverage per ton | Tons per 100 sq ft | Cu yd per 100 sq ft |
|---|---|---|---|
| 1" | 240 sq ft | 0.42 | 0.31 |
| 2" | 120 sq ft | 0.83 | 0.62 |
| 3" | 80 sq ft | 1.25 | 0.93 |
| 4" | 60 sq ft | 1.67 | 1.23 |
| 6" | 40 sq ft | 2.5 | 1.85 |
| 12" | 20 sq ft | 5 | 3.7 |
Frequently asked questions
+How many tons of river rock are in a cubic yard?
About 1.35 tons. River Rock weighs roughly 100 lb per cubic foot placed, and a cubic yard is 27 cubic feet, so 27 × 100 ÷ 2,000 = 1.35 tons.
+How much area does a ton of river rock cover?
At 3 inches deep, one ton covers about 80 square feet. At 2 inches it covers roughly 120 square feet.
+How deep should river rock be laid?
3 inches is standard for dry creek beds, borders and decorative ground cover. Over soft or clay subgrade, add 2 inches and place a woven geotextile separator so the stone does not disappear into the soil.
+Should I order extra?
Yes — 5 to 10%. Spread depth is never perfectly uniform, the subgrade has low spots, and coming up half a ton short means paying a second delivery fee that often exceeds the value of the material.
+What does river rock cost?
Delivered, $45 – $120 per ton in most US markets, versus $25 – $80 per ton across aggregates generally. Picking it up yourself saves the haul but rarely more than a few dollars a ton once fuel is counted.
+Do I need landscape fabric underneath?
Under decorative stone, yes — it slows weed growth and keeps the stone out of the soil. Under a compacted structural base, use a woven geotextile separator rather than a light weed fabric, which will tear during compaction.