Gravel, Crushed Stone & Base Rock Estimator
🛒 Recommended Materials & Supplies
Compare pricing and in-stock inventory for your project:
Heavy-Duty Geotextile Driveway Underlayment Fabric (6 ft × 100 ft)
High tensile woven polypropylene fabric prevents stone from sinking into clay.
Heavy-Duty 8" × 8" Steel Hand Tamper with Wooden Handle
Compact gravel base rock and bedding sand firmly without rental machine.
Heavy-Duty Dual-Wheel Wheelbarrow (6 Cu Ft)
Two-wheel balance makes hauling heavy gravel, mulch, and soil effortless.
How This Estimator Works
Our gravel and crushed stone calculator estimates the exact material weight and volume needed for driveways, walking paths, patio sub-bases, and French drainage trenches. Enter the length and width of your project area, choose your layer depth (such as 2 inches for decorative pea gravel walkways, 4 inches for crushed driveway bases, or 6 inches for drainage rock), and review the calculated bulk volume in cubic yards and estimated weight in US short tons. Because aggregate weights vary according to rock geology, moisture content, and compaction, imperial densities are expressed in US short tons per cubic yard (~1.35 short tons/yd³ default estimate; always confirm exact density with your local quarry or supplier).
Formulas & Calculation Principles
Volume in Cubic Feet = Length (ft) × Width (ft) × [ Depth (in) ÷ 12 ]
Volume in Cubic Yards = Volume in Cu Ft ÷ 27
Estimated Weight (US Short Tons) = Volume in Cu Yds × Density (US short tons per cu yd)
Metric Volume (m³) = Length (m) × Width (m) × [ Depth (cm) ÷ 100 ]
Estimated Weight (Metric Tonnes) = Volume in m³ × Density (~1.60 tonnes/m³)
Step-by-Step Worked Example
Building a 20 ft long by 10 ft wide crushed stone driveway section to a 4-inch depth using standard #57 limestone aggregate:
1. Area: 20 ft × 10 ft = 200 sq ft.
2. Volume in cubic feet: 200 sq ft × (4 in ÷ 12) = 200 × 0.333 = 66.67 cu ft.
3. In bulk cubic yards: 66.67 ÷ 27 = 2.47 cubic yards (approx 1.89 m³).
4. Estimated weight using standard 1.35 US short tons per cubic yard density:
- 2.47 cu yd × 1.35 short tons/yd³ = 3.33 US short tons (approx 6,670 lbs).
- In metric tonnes: 1.89 m³ × 1.60 tonnes/m³ = 3.02 tonnes.
5. Note: Density is an estimate; actual quarry weight tickets may vary between 3.2 and 3.5 short tons depending on stone moisture and compaction.
Frequently Asked Questions (FAQ)
How much does 1 cubic yard of gravel weigh?
One cubic yard of typical crushed stone, river rock, or pea gravel weighs approximately 2,600 to 2,800 lbs, which equals 1.30 to 1.40 US short tons (1 US short ton = 2,000 lbs). The calculator uses a standard baseline of 1.35 US short tons per cubic yard as an estimate. Always confirm exact material density with your supplier.
How deep should gravel be for a residential driveway?
A standard residential vehicle driveway requires 4 inches of compacted aggregate base rock (such as #21A or crusher run) topped with a 2-inch wearing surface layer of clean crushed stone (such as #57 stone), totaling 6 inches of stone structure.
What is the difference between crushed stone and pea gravel?
Crushed stone has angular, jagged edges that interlock under tire weight to create a firm, non-shifting driving surface. Pea gravel has smooth, rounded river pebbles that roll underfoot; pea gravel is ideal for decorative walkways and dog runs, but unsuitable for sloping driveways.
Should I install geotextile fabric beneath gravel?
Yes. Heavy-duty woven or non-woven geotextile landscape fabric is essential beneath gravel paths and driveways. Without fabric, stone aggregates sink into the sub-base soil over time, resulting in deep ruts, mud spots, and weed intrusion.
How much does gravel compact after rolling or tamping?
Crushed stone with fines (crusher run, road base, DGA) compacts by approximately 15% to 20% under plate tamping or vehicular rolling. Clean, washed uniform stone (such as #57) compacts by approximately 5% to 10%.
What type of gravel is best for French drains and foundation drainage?
Use clean washed #57 stone (roughly 3/4-inch to 1-inch angular stone with all dust and fine particles removed). Clean stone provides 30% to 40% void space between rocks, allowing high-volume groundwater flow without clogging.
Why are gravel quantities sold by the ton rather than by the yard?
Quarries and wholesale aggregate distributors use certified truck scales to weigh loads directly at departure, making payment by the US short ton (2,000 lbs) standard practice across North America.
Technical & Trade Disclaimer
Material quantities and volume estimates provided by this calculator are for planning and estimation purposes. Always consult local building codes, structural engineering drawings, or professional trade contractors before placing bulk orders.