How Much River Rock for 300 Square Feet?
How much river rock for 300 square feet depends on depth. At 3 inches you need about 2.78 cubic yards, roughly 3.8 tons at 1.35 tons per yard. At 2 inches the order drops to 2.5 tons.
Volume and tonnage calculator →River rock for 300 sq ft by depth
| Depth | Cubic yards | Tons | Tons +10% |
|---|---|---|---|
| 2 in | 1.85 | 2.5 | 2.8 |
| 3 in | 2.78 | 3.8 | 4.1 |
| 4 in | 3.70 | 5.0 | 5.5 |
Working it out
- 300 sq ft × (3 ÷ 12) ft = 75.0 cubic feet.
- ÷ 27 = 2.78 cubic yards.
- × 1.35 tons per yard = 3.8 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. Most suppliers will quote 1.25 to 1.45 tons per yard for this material.
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
Poor fit for:
- 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 12x24 area at 3 inches takes about 3.6 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.
- Ignoring the base. A thin surface layer over soft soil fails early no matter how much material is on top.
- Measuring only the main rectangle. Aprons, turnouts and curved edges add real square footage.
- Skipping drainage. Water sitting under any surface softens the base and leads to ruts and potholes.
Questions people ask
How many tons of river rock for 300 square feet?
About 3.8 tons at 3 inches deep.
How many cubic yards of river rock for 300 square feet?
About 2.78 yards at 3 inches.
How much river rock for 300 square feet at 2 inches?
About 2.5 tons, or 1.85 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.
Related guides
- How Much Does a Ton of River Rock Cover?
- Tons to Cubic Yards for Gravel: Conversion Chart
- How Much Does a Ton of Gravel Cover? Depth Chart
- How Much River Rock for 200 Square Feet?
- How Much River Rock for 250 Square Feet?
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