How Much Decomposed Granite for an 18 Foot Circle?
How much decomposed granite for an 18 foot circle: about 3.2 tons at 3 inches deep. A circle 18 feet across covers about 254.5 square feet (3.1416 × 9²).
Volume and tonnage calculator →The math
- Area: 254.5 sq ft.
- Depth in feet: 3 ÷ 12 = 0.250 ft.
- Cubic yards: 254.5 × 0.250 ÷ 27 = 2.36 yd³.
- Tons: × about 1.35 tons per yard = 3.2 tons.
The gravel calculator does this for any size.
Related: How Much Gravel for an 18 Foot Circle?
Decomposed granite needed by depth
| Depth | Cubic yards | Tons of decomposed granite | Tons +10% |
|---|---|---|---|
| 2 in | 1.57 | 2.1 | 2.3 |
| 3 in | 2.36 | 3.2 | 3.5 |
| 4 in | 3.14 | 4.2 | 4.7 |
| 6 in | 4.71 | 6.4 | 7.0 |
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. Rake the stone level after spreading and add a thin top-up after the first season.
Related: How Much Decomposed Granite for a 6 Foot Circle?
Buying the stone
If you haul it yourself, a typical half-ton pickup should carry only about half a cubic yard of stone, well under what the bed looks like it can hold. Decomposed granite packs into a firm, natural path when wetted and compacted in thin lifts. Round up by about 10 percent for compaction and uneven ground.
Measuring the area
Use a long tape and measure each side twice. If the ground slopes, measure depth at the high and low ends and average them. Irregular outlines can be broken into simple rectangles, triangles and circles; add the pieces for the total square footage before converting to tons.
Planning the cost
Stone is usually priced per ton or per cubic yard, and delivery is often a separate charge based on distance. A full truckload can cost less per ton than a partial one, so it can pay to combine projects. Ask whether the quote includes tax, delivery and any small-load fee before you compare yards.
Questions people ask
How many tons of decomposed granite for an 18 ft circle?
About 3.2 tons at 3 inches deep.
How many square feet is an 18 foot circle?
About 254.5 square feet.
How many tons of decomposed granite 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
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- 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 Pea Gravel for an 18 Foot Circle?
- How Much River Rock for an 18 Foot Circle?
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