How Much River Rock for a 12 Foot Circle?
Round areas such as fire pit patios, tree rings and seating circles use less stone than a square of the same width. A 12-foot circle is about 113.1 square feet; at 3 inches that is 1.4 tons of river rock.
Volume and tonnage calculator →The math
- Area: 113.1 sq ft.
- Depth in feet: 3 ÷ 12 = 0.250 ft.
- Cubic yards: 113.1 × 0.250 ÷ 27 = 1.05 yd³.
- Tons: × about 1.35 tons per yard = 1.4 tons.
The gravel calculator does this for any size.
Related: How Much Gravel for a 12 Foot Circle?
River rock needed by depth
| Depth | Cubic yards | Tons of river rock | Tons +10% |
|---|---|---|---|
| 2 in | 0.70 | 0.9 | 1.0 |
| 3 in | 1.05 | 1.4 | 1.6 |
| 4 in | 1.40 | 1.9 | 2.1 |
| 6 in | 2.09 | 2.8 | 3.1 |
Using a circle of stone
A round gravel area is easy to lay out with a stake and string at the center. Set flexible edging along the line and lay fabric inside before the stone goes in. For a fire pit area, keep combustibles well away and check local burn rules.
Related: How Much River Rock for a 6 Foot Circle?
Ordering and delivery
Small dump trucks commonly carry around 5 to 10 tons and tri-axles more, but loads vary by truck and state, so ask the yard what fits in one trip. River rock is smooth and decorative; larger sizes cover less area per ton at the same depth. Round up by about 10 percent for compaction and uneven ground.
Measuring the area
Measure length and width in feet at a few points and use the largest figures, since real sites are rarely square. For odd shapes, split the area into rectangles and circles, work out each one and add them together. Depth is the number most people underestimate: drive a stake, run a level string and measure down to the dug-out surface in several spots.
Planning the cost
Quarries and landscape suppliers set their own prices, and they change by region and season. Get the price per ton, the delivery fee and the minimum order. If two products will both work, compare cost per square foot at your depth rather than cost per ton.
Questions people ask
How many tons of river rock for a 12 ft circle?
About 1.4 tons at 3 inches deep.
How many square feet is a 12 foot circle?
About 113.1 square feet.
How many tons of river rock are in a cubic yard?
Roughly 1.35 tons for planning, but suppliers vary with stone size and moisture.
Should I put landscape fabric under the stone?
On soft or clay soil, a woven geotextile keeps stone from sinking into the dirt and makes the layer last longer.
Related guides
- Gravel for a Fire Pit Area: Best Types and Depth
- How Much Does a Ton of Gravel Cover? Depth Chart
- Tons to Cubic Yards for Gravel: Conversion Chart
- Crushed Stone vs Gravel: Differences and Best Uses
- Geotextile Fabric for Driveways: Woven vs Nonwoven and How Much You Need
- Compacting a Driveway Gravel Base in Lifts
- How Much Gravel for a 10 Foot Circle?
- How Much Pea Gravel for a 12 Foot Circle?
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