How Much River Rock for 150 Square Feet?
How much river rock for 150 square feet depends on depth. At 3 inches you need about 1.39 cubic yards, roughly 1.9 tons at 1.35 tons per yard. At 2 inches the order drops to 1.2 tons.
Volume and tonnage calculator →River rock for 150 sq ft by depth
| Depth | Cubic yards | Tons | Tons +10% |
|---|---|---|---|
| 2 in | 0.93 | 1.2 | 1.4 |
| 3 in | 1.39 | 1.9 | 2.1 |
| 4 in | 1.85 | 2.5 | 2.8 |
Working it out
- 150 sq ft × (3 ÷ 12) ft = 37.5 cubic feet.
- ÷ 27 = 1.39 cubic yards.
- × 1.35 tons per yard = 1.9 tons.
About river rock
River rock is mostly decorative and for drainage beds. It is not meant to be driven on and tends to roll if used as a walking surface. Typical weight: 1.25 to 1.45 tons per cubic yard.
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 20x25 area at 3 inches takes about 6.3 tons.
- Weight used here: about 1.35 tons per cubic yard.
Common estimating mistakes
- Ordering exactly the math. Uneven ground and spillage nearly always need a little more than the flat calculation.
- Mixing up cubic yards and tons. Yards are volume, tons are weight; convert with the product’s weight per yard.
- Assuming every supplier uses the same weight. Two yards selling the same product name can quote different tons per yard.
- Using inches as if they were feet. Depth has to be divided by 12 before you multiply; skipping that step inflates the order twelvefold.
Questions people ask
How many tons of river rock for 150 square feet?
About 1.9 tons at 3 inches deep.
How many cubic yards of river rock for 150 square feet?
About 1.39 yards at 3 inches.
How much river rock for 150 square feet at 2 inches?
About 1.2 tons, or 0.93 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 100 Square Feet?
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