Rock Calculator

Loose bulk densities from the US EPA Standard Volume-to-Weight Conversion Factors table.
Overrides the table density. A supplier ticket in tons per cubic yard divides by 27 and multiplies by 2000 to give lb/ft3.
Typical spreads: 2-3 in of mulch, 3-4 in of decorative stone, 4-6 in of driveway gravel, 4-6 in of new topsoil.
Loose delivered gravel loses roughly 10-20% of its volume when compacted into a base.
Volume
1.8617 yd3
Gravel, Soil and Mulch Calculator
Area covered
201.06 ft2
Area covered
22.340 yd2
Area covered
18.679 m2
Depth
3.000 in
Volume
50.265 ft3
Volume
1.4234 m3
Order this much (rounded up to the half yard)
2.00 yd3
Bulk density used
100.00 lb/ft3
Weight
5,027 lb
Weight
2.513 ton (US short)
Weight
2.280 t (metric)
Weight
2,280.0 kg
Order this much (rounded up to the half ton)
3.0 ton (US short)
One cubic yard covers
108.00 ft2
Worked out from U.S. EPA, Standard Volume-to-Weight Conversion Factors (loose bulk densities for gravel, sand, stone, soil, wood chips and compost) and 3 other sources.
No compaction allowance was applied. Loose gravel and crushed stone lose roughly 10-20% of their volume once compacted into a base.
Moisture content moves bulk weight substantially. Wet sand and gravel can be 20-30% heavier than the dry figures above.

How this is worked out

5 steps
  1. Area = pi/4 x ((20 ft)^2 - (12 ft)^2) = 201.062 sq ft
  2. Depth = 3 in = 0.25 ft
  3. Volume = 201.062 x 0.25 = 50.2655 cu ft = 1.8617 cu yd
  4. Density = 100 lb/ft3 (EPA table: Stone, crushed - 1 cubic foot - 100 lb (FEECO))
  5. Weight = 50.2655 x 100 = 5026.5 lb = 2.513 US short tons

Results are general information, not financial, tax, legal, medical or engineering advice.