Gravel Calculator
Calculate how much gravel, crushed stone or aggregate a driveway or path needs.
Last updated · View algorithm, constants and default inputs (JSON)
About this calculator
Estimate material volume and weight from the area, depth, selected material and waste allowance. Bulk density varies with grading, moisture and supplier, so treat tonnage and cost as planning estimates and confirm the delivered yield with your supplier.
Worked example
calculated with the default values below
Area length 40 ft · Area width 12 ft · Depth 4 in · Material Gravel (1.4 tons/cu yd) · Waste allowance 10 % · Price per ton 45 $ Area 480 sq ft · Volume 6.52 cu yd · Weight 9.13 tons · Volume 4.98 m³ · Estimated cost 410.67 $
General background references
Disclaimer
These calculators provide planning estimates only. Building codes, wiring regulations and safety requirements differ by country and change over time, and nothing here replaces a licensed professional or a permit. For structural, electrical or gas work, follow local code and have the installation inspected.
Implementation source
This record describes the implementation used by this page. It is not independent validation. External references, when available, support only the stated formula or definition; estimates and custom rules retain their own assumptions.
Formula and variables
T = L×W×(d/12)/27×(1+w/100)×ρ
- L
- Length, ft
- W
- Width, ft
- d
- Depth, in
- w
- Waste allowance, %
- ρ
- Material density, t/yd³
- T
- Total material, short tons
Volume (yd³) = length × width × (depth ÷ 12) ÷ 27 × (1 + waste ÷ 100); tons = volume × selected density. Density factors are planning assumptions and vary by material, grading and moisture; confirm supplier yield.
Frequently asked questions
How should I interpret the estimated weight and cost?
Estimate material volume and weight from the area, depth, selected material and waste allowance. Bulk density varies with grading, moisture and supplier, so treat tonnage and cost as planning estimates and confirm the delivered yield with your supplier.