How Much River Rock for 500 Square Feet?
How much river rock for 500 square feet depends on depth. At 3 inches you need about 4.63 cubic yards, roughly 6.3 tons at 1.35 tons per yard. Each inch of depth over 500 square feet adds about 1.54 yards.
Volume and tonnage calculator →River rock for 500 sq ft by depth
| Depth | Cubic yards | Tons | Tons +10% |
|---|---|---|---|
| 2 in | 3.09 | 4.2 | 4.6 |
| 3 in | 4.63 | 6.3 | 6.9 |
| 4 in | 6.17 | 8.3 | 9.2 |
Working it out
- 500 sq ft × (3 ÷ 12) ft = 125.0 cubic feet.
- ÷ 27 = 4.63 cubic yards.
- × 1.35 tons per yard = 6.3 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.
When to choose river rock
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 14x28 area at 2 inches takes about 3.3 tons.
- Weight used here: about 1.35 tons per cubic yard.
Common estimating mistakes
- Mixing up cubic yards and tons. Yards are volume, tons are weight; convert with the product’s weight per yard.
- Skipping drainage. Water sitting under any surface softens the base and leads to ruts and potholes.
- Forgetting that compaction shrinks loose material. A loose 4-inch spread of a dense-graded stone may finish closer to 3 inches after rolling.
- Ignoring the base. A thin surface layer over soft soil fails early no matter how much material is on top.
Questions people ask
How many tons of river rock for 500 square feet?
About 6.3 tons at 3 inches deep.
How many cubic yards of river rock for 500 square feet?
About 4.63 yards at 3 inches.
How much river rock for 500 square feet at 2 inches?
About 4.2 tons, or 3.09 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 300 Square Feet?
- How Much River Rock for 400 Square Feet?
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