Bags of River Rock for a 10x20 Patio
How many bags of river rock for a 10x20 patio: at 3 inches deep you need about 50.0 cubic feet, which is 100 bags of the common 0.5 cubic foot size. If your store sells river rock in 50-pound bags instead, figure about 100 bags, since river rock weighs roughly 100 pounds per cubic foot.
Volume and tonnage calculator →Bag count by depth
| Depth | Cubic feet | 0.5 cu ft bags | 50 lb bags (approx.) |
|---|---|---|---|
| 1 in | 16.7 | 34 | 34 |
| 2 in | 33.3 | 67 | 67 |
| 3 in | 50.0 | 100 | 100 |
| 4 in | 66.7 | 134 | 134 |
How to figure it
- Area: 10 × 20 = 200 sq ft.
- Volume: 200 × (3 ÷ 12) = 50.0 cu ft.
- Bags: 50.0 ÷ 0.5 = 100 bags (round up).
Bags or bulk?
A cubic yard is 27 cubic feet, so 50.0 cubic feet is 1.85 yards, about 2.5 tons. Past about a yard, bulk is usually less work and often less money. Compare the bag price × 100 against a bulk quote for 2.8 tons delivered.
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.
Install tips for a patio
- Dig and level. Remove sod and set the base slightly below the surrounding grade.
- Edge it. Steel, plastic or stone edging keeps material in place.
- Spread in layers. Rake to depth, then rake smooth; rounded stone will not compact.
- Buy a few extra. Grab 5 to 10 percent more bags for settling and touch-ups.
The volume and tonnage calculator handles other sizes and depths.
Good and poor uses for river rock
Works well for:
- 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 3 inches takes about 4.9 tons.
- Weight used here: about 1.35 tons per cubic yard.
Mistakes that throw off the order
- 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.
- Using inches as if they were feet. Depth has to be divided by 12 before you multiply; skipping that step inflates the order twelvefold.
- Ordering exactly the math. Uneven ground and spillage nearly always need a little more than the flat calculation.
Questions people ask
How many bags of river rock for a 10x20 patio?
About 100 bags of 0.5 cubic feet at 3 inches deep.
How many 50 lb bags of river rock for 10x20?
About 100 bags at 3 inches.
How many 0.5 cubic foot bags are in a cubic yard?
54 bags.
How many cubic feet is a 10x20 patio at 3 inches?
About 50.0 cubic feet.
When does bulk make more sense?
Usually once the job passes about a cubic yard, or when you would need more than a few car trips.
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
- Bags of River Rock for a 10x16 Patio
- Bags of River Rock for a 10x18 Patio
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