Aggregate Calculator — Estimate Gravel, Stone & Sand for Landscaping

Calculate exactly how much aggregate material your project needs. Free online aggregate calculator for gravel, crushed stone, sand, and more with cubic yard and tonnage estimates.

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Aggregate Calculator

Enter your project dimensions and select a material type to calculate the aggregate volume and estimated weight.

Enter dimensions and click Calculate Aggregate to see the results.

Aggregate Calculation Formula Explained

The aggregate calculator formula determines the volume and weight of material needed for your landscaping project. It converts your area dimensions into cubic yards and then estimates tonnage using material density.

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

Variable Definitions

  • Length & Width — The dimensions of the area to be covered, measured in feet
  • Depth — The desired thickness of the aggregate layer, measured in inches
  • Cubic Feet — The total volume in cubic feet (Length × Width × Depth in feet)
  • Cubic Yards — The volume in cubic yards (1 cubic yard = 27 cubic feet)
  • Material Density — The weight of the material per cubic yard, varies by aggregate type

How to Calculate Aggregate Material Needed

Follow these steps to accurately estimate the amount of gravel, stone, or sand for your project:

  1. Measure the area — Record the length and width of the space in feet. For irregular shapes, break the area into rectangles and calculate each separately.
  2. Determine the depth — Choose your desired aggregate depth in inches. For decorative gravel, 2-3 inches is common. For driveways, use 4-6 inches.
  3. Calculate cubic feet — Multiply length × width × (depth ÷ 12) to get the volume in cubic feet.
  4. Convert to cubic yards — Divide cubic feet by 27. This is the standard unit for ordering bulk aggregate.
  5. Estimate tonnage — Multiply cubic yards by the material's density in tons per cubic yard to get the estimated weight.

Aggregate Calculator Examples

Example 1: Gravel Driveway

A driveway measuring 20 ft × 30 ft at 4 inches deep using gravel (1.40 tons/yd³).

Cubic Feet = 20 × 30 × (4 ÷ 12) = 200 ft³
Cubic Yards = 200 ÷ 27 = 7.41 yd³
Estimated Tons = 7.41 × 1.40 = 10.37 tons

Example 2: Decorative Stone Path

A garden path measuring 3 ft × 25 ft at 2 inches deep using pea gravel (1.35 tons/yd³).

Cubic Feet = 3 × 25 × (2 ÷ 12) = 12.5 ft³
Cubic Yards = 12.5 ÷ 27 = 0.46 yd³
Estimated Tons = 0.46 × 1.35 = 0.62 tons

Example 3: Large Landscaping Area

A landscaping bed measuring 40 ft × 15 ft at 3 inches deep using river rock (1.45 tons/yd³).

Cubic Feet = 40 × 15 × (3 ÷ 12) = 150 ft³
Cubic Yards = 150 ÷ 27 = 5.56 yd³
Estimated Tons = 5.56 × 1.45 = 8.06 tons

Real-World Aggregate Applications

  • Driveway Construction: Calculate the gravel or crushed stone base needed for residential driveways with proper depth for vehicle support.
  • Garden Pathways: Estimate decorative stone or pea gravel for walking paths with the right coverage depth.
  • Drainage Systems: Determine the aggregate volume required for French drains and drainage trenches.
  • Patio Base Layers: Calculate the compacted aggregate base needed beneath paver patios and stone surfaces.
  • Erosion Control: Estimate riprap or larger stone quantities for slope stabilization and erosion prevention.
  • Mulch Alternative: Use aggregate as a long-lasting ground cover replacement for organic mulch in xeriscaping.
  • Concrete Mixing: Calculate sand and gravel components for DIY concrete projects by volume.

People Also Ask About Aggregate Calculation

Multiply length × width × depth (in feet) to get cubic feet. Divide by 27 to convert to cubic yards. To estimate tons, multiply cubic yards by the material's density in tons per cubic yard. For example, a 10ft × 20ft area at 3 inches deep requires about 1.85 cubic yards of aggregate.
Typical gravel density ranges from 1.3 to 1.5 tons per cubic yard depending on the specific type. Pea gravel averages about 1.35 tons/cubic yard, crushed stone about 1.35 tons/cubic yard, and river rock about 1.45 tons/cubic yard. Always check with your supplier for exact densities.
At a 3-inch depth, you need approximately 0.0093 cubic yards per square foot. At 4 inches, about 0.0123 cubic yards per square foot. For a quick estimate, 100 square feet at 3 inches deep requires roughly 0.93 cubic yards of aggregate material.
Divide the total cubic feet by 27 to get cubic yards. There are 27 cubic feet in one cubic yard (3ft × 3ft × 3ft = 27). For example, 54 cubic feet divided by 27 equals 2 cubic yards of aggregate.
For decorative gravel or stone, 2-3 inches is standard. For driveways and pathways, use 4-6 inches for proper support. For drainage applications, 6-12 inches may be needed. Always compact the base layer and account for settling when calculating aggregate depth.

Frequently Asked Questions About Aggregate Calculation

This calculator provides the base volume and tonnage estimate. For projects requiring compaction, add 10-15% extra material to account for settling. Compacted aggregate can reduce in volume by up to 15% compared to loose material.
Yes. Select from gravel, crushed stone, sand, pea gravel, river rock, or limestone from the dropdown. Each material type has a preset density value. You can also enter a custom density if your supplier provides a specific value.
Aggregate is sold both by volume (cubic yards) and by weight (tons). Cubic yards tell you how much space the material will fill. Tons tell you the weight, which is important for delivery truck capacity and pricing from suppliers who charge by weight.
Break irregular areas into smaller rectangles, calculate each separately, and sum the totals. For circular areas, use the formula π × radius² to find the square footage, then multiply by depth. For triangular areas, use (base × height ÷ 2) for the square footage.
Tonnage estimates are approximate because material density varies by moisture content, compaction, and specific quarry sources. Our densities are industry-standard averages. For precise ordering, confirm the density with your local supplier and add 5-10% as a safety margin.
Absolutely. Select "Sand" from the material dropdown for a density of 1.30 tons per cubic yard. Sand is commonly used for paver bases, playgrounds, and mixing concrete. The same volume formulas apply regardless of the aggregate type selected.

Aggregate Glossary

Aggregate

Granular materials such as gravel, crushed stone, sand, or slag used in construction and landscaping for bases, drainage, and decorative purposes.

Cubic Yard

A unit of volume equal to 27 cubic feet (3ft × 3ft × 3ft). The standard unit for ordering and pricing bulk aggregate materials.

Material Density

The weight of aggregate per unit volume, typically expressed in tons per cubic yard. Varies by material type and moisture content.

Compaction

The process of mechanically compressing aggregate to reduce air voids and increase density. Compacted material occupies less volume than loose material.

Crushed Stone

Angular aggregate produced by mechanically crushing larger rocks. Used for driveways, drainage, and as a base material with a typical density of 1.35 tons/yd³.

Pea Gravel

Small, smooth, rounded stones about 3/8 inch in size. Popular for decorative landscaping, pathways, and playground surfaces. Density approximately 1.35 tons/yd³.

River Rock

Naturally rounded stones harvested from riverbeds, typically 1-3 inches in diameter. Used decoratively with a density of about 1.45 tons/yd³.

Tonnage

The weight of aggregate material measured in tons (2,000 lbs per ton). Many suppliers price and deliver aggregate based on tonnage rather than volume.

Editorial Review & Methodology

This aggregate calculator was built and reviewed by the NumbrWiz Editorial Team. The aggregate volume formula is a standard construction industry calculation verified against landscaping best practices, ASTM construction aggregate standards, and supplier ordering guidelines.

  • Formula verification: Cross-checked against industry-standard volume calculations and material density references.
  • Density data: Material density values sourced from aggregate supplier data sheets and standard construction references.
  • Edge case testing: Tested with zero-depth scenarios, large commercial-scale dimensions, and fractional inch inputs.
  • UX review: Designed with clear labeling and intuitive input flow for both homeowners and landscaping professionals.

Transparency note: All calculations run client-side in your browser. No data is ever collected, stored, or transmitted. Results are for estimation purposes; always confirm quantities with your material supplier before ordering. Material densities are industry averages and may vary by source and moisture content.

Page last reviewed: May 2026 · NumbrWiz Editorial Team