Stone Calculator: Free Online Stone Quantity Estimator
Use our free stone calculator to determine how much stone material you need for any project. Whether you are building a patio, laying a pathway, constructing a retaining wall, or installing a gravel driveway, this tool calculates stone tonnage and cubic yardage from your dimensions. Designed for contractors, masons, landscapers, and homeowners, it supports crushed stone, gravel, flagstone, and more.
How to use this calculator.
- Enter your project dimensions. Input the length and width of the area to be covered or filled with stone, in feet.
- Set the stone depth. Enter the desired depth of the stone layer, in inches.
- Adjust the density. The default is 100 lb/ft³, a reasonable average for crushed stone and gravel. Adjust it if you know the specific material's density.
- Review your results. The calculator displays area, stone volume (cubic yards), and stone weight (tons) instantly.
- Add your own waste margin. This calculator gives you the raw material quantity; add extra for compaction and handling waste manually (see tips below).
How do you calculate stone quantity, weight, and coverage?
Stone quantity is calculated by multiplying the project area by the depth to get volume, then converting to weight using the material's density.
Area (sq ft) = Length (ft) × Width (ft)
Volume (cu yd) = Length (ft) × Width (ft) × Depth (in) ÷ 12 ÷ 27
Weight (tons) = Volume (cu yd) × Density (lb/ft³) × 27 ÷ 2,000
Where:
- Length and width: The dimensions of the area to be covered or filled with stone, in feet.
- Depth: The thickness of the stone layer, in inches.
- Density: The mass per unit volume of the stone, typically 90-115 lb/ft³ (2,400-2,900 lb/cu yd) for crushed stone, gravel, and river rock. Denser materials like granite run toward the higher end.
Example calculation.
Let's calculate stone for a patio base.
Scenario: A patio is 16 ft long and 12 ft wide. You need a 4-inch base of crushed stone at the default density of 100 lb/ft³ under the pavers.
- Calculate area: 16 ft × 12 ft = 192 sq ft
- Convert depth to feet: 4 inches ÷ 12 = 0.33 ft
- Calculate volume in cubic feet: 192 sq ft × 0.33 ft = 64 cu ft
- Convert to cubic yards: 64 cu ft ÷ 27 = 2.37 cu yd
- Calculate weight in tons: 2.37 cu yd × 100 lb/ft³ × 27 ÷ 2,000 = 3.2 tons
Result: You need approximately 3.2 tons (2.37 cubic yards) of crushed stone for this patio base, before adding a compaction and waste margin.
Tips from the field.
- Add 10% for base material, 5% for surface dressing.Loose stone compacts roughly 15-20% once placed and tamped, so order more than the raw calculated volume.
- Use angular crushed stone for structural applications.Angular stone (like #57 or #3) interlocks under load; rounded gravel shifts more and provides less bearing capacity.
- Match stone size to the job. Use larger stone (#3, #4) for drainage and base layers, and finer screenings (#10) for leveling and paver bedding.
- Install geotextile fabric under decorative stone. A non-woven fabric barrier blocks weeds while still letting water drain through; plastic sheeting traps water and should be avoided.
- Know your density before ordering. Stone density varies by material and moisture; ask your supplier for the specific lb/ft³ or tons/cu yd figure rather than relying on a generic average.
Disclaimer: This calculator provides estimates for planning purposes only. Actual stone requirements depend on compaction, material gradation, job site conditions, and installation method. For structural applications, consult a licensed professional. PavementCalculator.com assumes no liability for material overages or shortages.
Cost, price, and density figures on this page reflect approximate U.S. averages as of August 2026 and vary by region, supplier, and material availability.
Frequently asked questions.
How many tons of stone do I need?
Calculate volume first: Area (sq ft) × Depth (ft) ÷ 27 = cubic yards. Then convert to tons: cubic yards × 1.35 (average stone density). For a 200 sq ft path at 4 inches deep: 200 × (4÷12) ÷ 27 = 2.47 cu yd × 1.35 = 3.3 tons. Add 5-10% for compaction and waste. One ton of stone covers approximately 80-100 sq ft at 2 inches deep. Use our calculator above with your exact dimensions.
What's the difference between crushed stone and gravel?
Crushed stone is mechanically broken rock with angular faces: it locks together well, making it ideal for base courses, driveways, and construction. Gravel is naturally weathered and rounded: it doesn't lock as well but is more aesthetically pleasing. Crushed stone is preferred for structural applications (under pavement, concrete). Gravel is preferred for decorative purposes and paths. Both come in various sizes and colors.
What size stone should I use?
#57 stone (3/4-1 inch): General purpose, drainage, concrete. #8 stone (3/8-1/2 inch): Pathways, top dressing. #4 stone (1-2 inch): Drainage, erosion control. #2 stone (2-3 inch): Heavy drainage, rip rap base. Crusher run/road base (3/4-inch minus): Driveway and pavement base. #10 screenings (fine dust): Leveling, paver bedding. The number refers to the sieve size the stone passes through.
How much does a cubic yard of stone weigh?
Crushed stone: 2,600-2,800 lbs/cu yd (1.3-1.4 tons). River rock: 2,400-2,700 lbs/cu yd (1.2-1.35 tons). Pea gravel: 2,600-2,800 lbs/cu yd (1.3-1.4 tons). Limestone: 2,500-2,900 lbs/cu yd (1.25-1.45 tons). The weight varies by stone type, moisture content, and compaction. For heavy equipment or structural loading, use the higher end of the range. For trucking estimates, use 1.35 tons/cu yd as a safe average.
How do I keep weeds from growing through stone?
Install quality non-woven geotextile landscape fabric under the stone: it blocks light while allowing water to percolate through. Use a 4-6 inch overlap at seams secured with landscape staples. The stone depth should be at least 2-3 inches: shallow stone layers allow enough light penetration for weed seeds to germinate. Pre-emergent herbicides (like Preen) applied annually also help. Never use plastic sheeting: it traps water, kills soil biology, and eventually tears.
How much stone do I need for a 10x10 area?
A 10 ft × 10 ft area (100 sq ft) with 2 inches of stone requires about 0.62 cubic yards, or roughly 0.9 tons of crushed stone. At 4 inches deep, the requirement doubles to 1.23 cubic yards or about 1.85 tons. Use our calculator above for your exact depth and stone type.
What type of stone is best for a driveway base?
For a driveway base, use angular crushed stone like #3 or #57 stone. Angular stone interlocks and provides better load-bearing capacity than rounded gravel. A 6–8 inch base of larger stone topped with 2–4 inches of smaller stone is the standard construction for gravel driveways.
How do I calculate stone for a retaining wall?
For a retaining wall, you need stone for the wall itself plus drainage stone behind it. The wall stone is calculated from wall height, length, and thickness. Drainage stone (clean #57 stone) should fill a 12-inch-wide zone behind the entire wall, extending from the footing to within 6 inches of the top. Include a perforated drain pipe at the base.