Crushed Stone Calculator — Estimate Tons & Cubic Yards Instantly

Calculate exactly how much crushed stone your project needs. Free online calculator for cubic yards, cubic feet, and estimated tons — perfect for driveways, landscaping, patios, and drainage projects.

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Crushed Stone Calculator

Enter your project dimensions and stone type to calculate the exact amount of crushed stone needed in cubic yards, cubic feet, and estimated tons.

Enter dimensions and click Calculate Crushed Stone to see your material estimate.

Crushed Stone Formula Explained

The crushed stone formula calculates the volume of material needed by multiplying area by depth, then converting to industry-standard units. This three-step formula ensures accurate material ordering for any project.

Cubic Feet = Length (ft) × Width (ft) × Depth (in) ÷ 12
Cubic Yards = Cubic Feet ÷ 27
Estimated Tons = Cubic Yards × Stone Density (tons/yd³)

Variable Definitions

  • Length & Width — The area dimensions measured in feet (length × width = square footage)
  • Depth — The desired thickness of crushed stone in inches (divide by 12 to convert to feet)
  • Cubic Feet — Total volume in cubic feet (1 cubic foot = a cube 1ft × 1ft × 1ft)
  • Cubic Yards — Standard unit for ordering bulk stone (1 cubic yard = 27 cubic feet)
  • Stone Density — Weight per cubic yard, typically 1.3–1.7 tons depending on stone type

One cubic yard of crushed stone typically covers about 100 square feet at 3 inches deep. Always add 5–10% extra for compaction and waste.

How to Calculate Crushed Stone Needed

Follow these steps to accurately estimate the amount of crushed stone for your landscaping or construction project:

  1. Measure the area — Use a tape measure to find the length and width of the project area in feet. For irregular shapes, break the area into rectangles and calculate each separately.
  2. Determine depth — Choose the stone depth in inches based on your project: 2–3 inches for decorative landscaping, 4–6 inches for driveways, and 6–8 inches for heavy-duty bases.
  3. Calculate cubic feet — Multiply length × width × (depth ÷ 12). This gives you the total volume in cubic feet.
  4. Convert to cubic yards — Divide cubic feet by 27. This is the standard unit used by stone suppliers and landscape supply yards.
  5. Estimate tons — Multiply cubic yards by the stone density for your chosen material. General crushed stone weighs about 1.5 tons per cubic yard.
  6. Add overage — Increase your total by 5–10% to account for compaction, settling, and minor spillage during installation.

Crushed Stone Calculation Examples

Example 1: Standard Driveway

A driveway measuring 20 ft long × 12 ft wide with a 4-inch depth of 3/4" crushed stone.

Cubic Feet = 20 × 12 × (4 ÷ 12) = 80 ft³
Cubic Yards = 80 ÷ 27 = 2.96 yd³
Tons = 2.96 × 1.4 = 4.14 tons

With 10% overage: order approximately 3.3 cubic yards or 4.6 tons.

Example 2: Garden Pathway

A garden path measuring 30 ft long × 3 ft wide with a 2-inch depth of pea gravel.

Cubic Feet = 30 × 3 × (2 ÷ 12) = 15 ft³
Cubic Yards = 15 ÷ 27 = 0.56 yd³
Tons = 0.56 × 1.3 = 0.72 tons

Example 3: Large Patio Base

A patio base measuring 25 ft × 25 ft with a 6-inch depth of crushed limestone.

Cubic Feet = 25 × 25 × (6 ÷ 12) = 312.5 ft³
Cubic Yards = 312.5 ÷ 27 = 11.57 yd³
Tons = 11.57 × 1.5 = 17.36 tons

Real-World Crushed Stone Applications

  • Driveway Construction: Crushed stone provides a durable, well-draining surface for residential and commercial driveways. Typical depth: 4–6 inches.
  • Patio & Walkway Base: Used as a compacted base layer beneath pavers, flagstone, or brick. Typical depth: 4–6 inches.
  • French Drains: Crushed stone surrounds perforated pipes to facilitate water drainage away from foundations. Typical depth: 8–12 inches.
  • Decorative Landscaping: Stone mulch for flower beds, borders, and rock gardens. Typical depth: 2–3 inches.
  • Retaining Wall Backfill: Provides drainage behind retaining walls to prevent hydrostatic pressure buildup. Typical depth: 6–12 inches.
  • Erosion Control: Riprap and larger crushed stone stabilize slopes and shorelines against water erosion.
  • Construction Subbase: Compacted crushed stone forms a stable foundation for concrete slabs, roads, and building foundations.

People Also Ask

Multiply length (ft) × width (ft) × depth (inches) ÷ 12 to get cubic feet. Divide by 27 to convert to cubic yards. For tons, multiply cubic yards by the stone density — typically 1.4–1.6 tons per cubic yard depending on the stone type. Use the calculator above for instant results.
Crushed stone generally weighs between 1.3 and 1.7 tons per cubic yard depending on the material. General crushed stone averages about 1.5 tons per cubic yard, while crushed granite is closer to 1.6 tons per cubic yard and pea gravel is about 1.3 tons per cubic yard.
For a standard gravel driveway, crushed stone should be 4–6 inches deep. This provides adequate coverage, stability, and drainage. For pathways and decorative landscaping, 2–4 inches is typically sufficient. Deeper applications may require multiple layers with larger base stone underneath.
For general landscaping, 3/4-inch crushed stone is the most popular choice — it compacts well, drains effectively, and provides a clean appearance. For pathways, 1/2-inch stone offers a smoother surface. Larger 1–2 inch stone works well for drainage applications and decorative accents.
One cubic yard of crushed stone covers approximately 100 square feet at 3 inches deep, 80 square feet at 4 inches deep, or 54 square feet at 6 inches deep. Coverage decreases as depth increases because the total volume is spread over a smaller area at greater thickness.

Frequently Asked Questions

This calculator uses standard industry formulas for volume and weight estimation. Results are highly accurate for rectangular areas with consistent depth. For irregular shapes, break the area into smaller rectangles and sum the results. Always add 5–10% for compaction, settling, and waste.
Yes. It is recommended to add 5–10% extra to your calculated amount. Crushed stone compacts over time, especially under vehicle traffic or heavy use. Ordering extra ensures you won't run short during installation and accounts for uneven subgrade and minor spillage.
Yes. The volume calculations (cubic feet and cubic yards) work for any bulk material including pea gravel, river rock, decomposed granite, and mulch. For tonnage estimates, select the material type from the dropdown or adjust the density value to match your specific material.
One cubic yard equals 27 cubic feet (3 ft × 3 ft × 3 ft). Bulk stone is almost always sold by the cubic yard, so converting from cubic feet to cubic yards (÷ 27) is essential for accurate ordering from landscape supply yards and quarries.
Break the irregular area into smaller rectangles and triangles. Calculate each section separately using this calculator, then add the results together. For circular areas, use the formula: Area = π × radius², then multiply by depth and convert to cubic yards as usual.
Recommended depths: decorative landscaping and mulch replacement = 2–3 inches; walkways and garden paths = 3–4 inches; residential driveways = 4–6 inches; heavy-use commercial driveways = 6–8 inches; patio and paver bases = 4–6 inches; French drains = 8–12 inches.

Crushed Stone Glossary

Cubic Yard

The standard unit for ordering bulk stone, equal to 27 cubic feet. One cubic yard covers approximately 100 sq ft at 3 inches deep.

Cubic Foot

A volume measurement equal to a cube 1 foot on each side. Used as an intermediate step when calculating bulk material volumes.

Aggregate

Granular material such as sand, gravel, or crushed stone used in construction. Aggregates form the base for concrete, asphalt, and drainage systems.

Compaction

The process of mechanically compressing stone to reduce air voids and increase density. Compacted stone settles 5–15% from its loose volume.

Stone Density

The weight of stone per unit volume, typically expressed in tons per cubic yard. Varies by material: granite (~1.6), limestone (~1.5), pea gravel (~1.3).

Subbase

The compacted layer of crushed stone beneath pavers, concrete, or asphalt that provides structural support and drainage.

Grading

The distribution of stone particle sizes within a batch. Well-graded stone has a mix of sizes that interlock for better compaction and stability.

Riprap

Large, angular stone (4–12+ inches) used for erosion control on slopes, shorelines, and drainage channels. Heavier and more stable than standard crushed stone.

Editorial Review & Methodology

This crushed stone calculator was built and reviewed by the NumbrWiz Editorial Team. The formulas used are standard industry calculations for construction material estimation, verified against guidelines from the National Stone, Sand & Gravel Association (NSSGA) and standard landscaping best practices.

  • Formula verification: Cross-checked against multiple authoritative construction and landscaping reference guides.
  • Density values: Sourced from industry-standard material weight tables used by quarries and landscape supply yards across the United States.
  • Edge case testing: Tested with very small areas, large commercial projects, fractional dimensions, and extreme depth values.
  • UX review: Designed for intuitive input with clear error messaging and step-by-step calculation breakdown.

Transparency note: All calculations run client-side in your browser. No data is ever collected, stored, or transmitted. Results are estimates for planning purposes; always confirm quantities with your supplier before ordering. Actual coverage may vary based on stone gradation, moisture content, and compaction method.

Page last reviewed: May 2026 · NumbrWiz Editorial Team