Purpose and steps
Area multiplied by depth gives gravel volume. Cubic yards are multiplied by the selected material density to estimate tons; the suggested order rounds up to a half-ton increment.
- Measure each area in consistent length units and confirm the product’s package coverage or volume yield.
- Split irregular areas into regular shapes and enter dimensions, depth or coverage. Set openings, waste and coats for the actual project.
- Check the headline result and its components. A key interpretation for this tool is: Ask whether the supplier sells by scale weight or loader volume.
- Compare the baseline with a changed scenario: Clarify whether entered depth is loose or compacted depth.
Model-specific method
How this calculator produces its result
Volume = area × compacted depth. Estimated tons = cubic yards × selected density; the order recommendation rounds up to a practical increment.
Volume, density and cubic unit conversions
A thin layer still has a three-dimensional volume. Multiplying square feet by inches without dividing depth by twelve overstates cubic feet by a factor of twelve. One cubic yard is three feet in each direction, hence 3³=27 cubic feet, not three cubic feet.
Converting volume into gravel mass adds a density assumption, while converting concrete volume into bags adds a product-yield assumption. Settlement, compaction, voids and moisture change these quantities. Measure finished depth and use supplier specifications; a bag’s dry weight is not interchangeable with its volume yield.
Volume V = area A × depth d Mass = V × bulk density Bags = ceil(V / yield per bag) 1 yd³ = 27 ft³
- Convert depth to the same length unit as the area dimensions
- Bulk density must match the chosen material and moisture
- Bag yield is volume after mixing when the product specifies it
- One cubic unit involves three length dimensions
Worked example
A 30 × 10 ft drive at 4 in deep needs about 3.70 cu yd. At 1.4 tons/cu yd, that is about 5.2 tons before additional compaction allowance.
Reading results without overstating them
- Ask whether the supplier sells by scale weight or loader volume.
- Clarify whether entered depth is loose or compacted depth.
Assumptions and exclusions
- Compaction, moisture, and aggregate grading change actual weight.
- U.S. suppliers may quote by ton or cubic yard; confirm their sales unit.
- Moisture, gradation, material density, compaction, and uneven subgrade change tonnage.
Sources and content notes
Toolify describes the implemented algorithm and its assumptions. Sources below support the topic or applicable rules; they do not endorse this calculator. Examples are illustrative, and published rules take precedence over simplified estimates.
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