9 Cubic Yards of River Rock in Tons
9 cubic yards of river rock in tons works out to about 12.2 tons using a planning weight of 1.35 tons per yard. Real loads land between roughly 11.2 and 13.0 tons depending on stone size, fines and moisture. That is about 24,300 pounds.
Volume and tonnage calculator →The conversion
- Yards × tons per yard: 9 × 1.35 = 12.2 tons.
- Low end: 9 × 1.25 = 11.2 tons.
- High end: 9 × 1.45 = 13.0 tons.
Quarries can tell you the weight per yard for their own product; use it if you have it.
What 9 yards covers
| Depth | Square feet |
|---|---|
| 2 in | 1,458 |
| 3 in | 972 |
| 4 in | 729 |
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.
Hauling 9 yards
At about 12.2 tons, this is roughly a tandem-axle truckload. A pickup is a poor fit for anything past a fraction of a yard; see how much gravel a half-ton pickup can carry.
Before you order
- Confirm whether the yard prices river rock by the ton or by the yard.
- Add about 10 percent for compaction and uneven ground.
- Clear a firm spot for the truck to dump.
The volume and tonnage calculator converts any area and depth into yards and tons.
Where river rock fits
Best suited to:
- 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
- Using inches as if they were feet. Depth has to be divided by 12 before you multiply; skipping that step inflates the order twelvefold.
- Mixing up cubic yards and tons. Yards are volume, tons are weight; convert with the product’s weight per yard.
- Ordering exactly the math. Uneven ground and spillage nearly always need a little more than the flat calculation.
- Skipping drainage. Water sitting under any surface softens the base and leads to ruts and potholes.
Questions people ask
How many tons is 9 yards of river rock?
About 12.2 tons, with a typical range of 11.2 to 13.0.
How many pounds is 9 cubic yards of river rock?
About 24,300 pounds.
How much area does 9 yards of river rock cover at 3 inches?
About 972 square feet.
Why does river rock weight vary?
Stone size, the share of fines and moisture all change how much a yard weighs.
Is it better to buy by the ton or the yard?
Either works; just convert with the supplier’s own weight per yard so the two quotes compare fairly.
Related guides
- How Much Does a Ton of River Rock Cover?
- Tons to Cubic Yards for Gravel: Conversion Chart
- How Much Does a Yard of Crushed Stone Weigh?
- 7 Cubic Yards of River Rock in Tons
- 8 Cubic Yards of River Rock in Tons
As an Amazon Associate, AsphaltTons.com earns from qualifying purchases. Product links below are sponsored.