River 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.
Used when you are starting from a tonnage. The bulk density above converts it to a volume.
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.
Raised beds and garden beds are normally filled with a blend rather than one material. Set the share below.
By volume. 0 means a single material. A common raised-bed fill is roughly a third compost by volume.
Volume
4.6296 yd3
Gravel, Soil and Mulch Calculator
Area covered
500.00 ft2
Area covered
55.556 yd2
Area covered
46.452 m2
Depth
3.000 in
Volume
125.000 ft3
Volume
3.5396 m3
Order this much (rounded up to the half yard)
5.00 yd3
Bulk density used
18.52 lb/ft3
Weight
2,315 lb
Weight
1.157 ton (US short)
Weight
1.050 t (metric)
Weight
1,050.0 kg
Bags needed
63
Order this much (rounded up to the half ton)
1.5 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

6 steps
  1. Area = 500 sq ft entered directly = 500 sq ft
  2. Depth = 3 in = 0.25 ft
  3. Volume = 500 x 0.25 = 125 cu ft = 4.6296 cu yd
  4. Density = 18.519 lb/ft3 (EPA table: Wood chips, shredded - 1 cubic yard - 500 lb (U.S. EPA); 500/27 = 18.519)
  5. Weight = 125 x 18.519 = 2314.8 lb = 1.157 US short tons
  6. Bags = ceil(125 cu ft / 2 cu ft) = 63

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