Estimate crushed stone, river rock, and decorative landscape rock tonnage, cubic yards, and 50-lb retail bags.
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A stone calculator calculates the tonnage and volume of crushed stone, washed river rock, and decorative rip-rap required for drainage swales, retaining wall backfill, and garden landscaping.
\text{Tons} = \frac{L \times W \times (D / 12)}{27} \times 1.10 \times \rho_{\text{stone}}Standard #57 crushed limestone has a bulk density of 1.45 tons per cubic yard (2,900 lbs/yd³). River rock averages 1.35 tons/yd³.
Scenario: Filling a 30 ft by 4 ft dry creek bed with 4 inches of decorative river rock.
Square footage: 30 × 4 = 120 sq ft.
Volume: 120 × (4 ÷ 12) = 40 cu ft.
Cubic yards with 10% allowance: (40 ÷ 27) × 1.10 = 1.63 cu yds.
Tonnage (river rock @ 1.35 tons/yd³): 1.63 × 1.35 = 2.20 tons.
Gravel is naturally rounded stone shaped by water erosion (like river rock and pea gravel). Crushed stone is mechanically quarried and crushed, producing sharp, angular edges that interlock tightly for stable bases.
#57 stone refers to aggregate graded between 0.5 inches and 1.0 inch in size. It is the most widely used stone size in America for driveways, concrete mix, and drainage.
One cubic yard of crushed stone weighs approximately 2,700 to 2,900 pounds (1.35 to 1.45 US tons).
There are exactly 40 fifty-pound bags in one US ton (2,000 lbs ÷ 50 lbs = 40 bags).
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= 4.89 Cubic Yards (6.43 Metric Tonnes)