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Aggregate Compaction Shrink Calculator

Loose-to-Compacted Volume Conversion, Shrink Factors, and Tonnage for Base Course, Backfill, and Drainage Stone

Free aggregate compaction calculator for hardscape contractors, excavation crews, and site work estimators who need to determine how much loose aggregate to order when the plans specify compacted-in-place volume. Enter the compacted volume required (cubic yards or cubic feet), select the aggregate type, and the calculator returns the loose volume to order after applying the correct shrink factor for compaction, plus the tonnage based on the material's compacted unit weight.

Every aggregate material shrinks when compacted, and the shrink percentage varies significantly by material type. Crusher run (dense-graded aggregate base) typically shrinks 20-25% from loose to compacted state. 3/4" clean stone shrinks only 5-10% because the uniform particle size leaves less void space to compact. Sand shrinks 10-15%, and recycled concrete can shrink 15-25% depending on gradation. If you order aggregate based on the compacted volume shown on the plans without applying the shrink factor, you will come up short on every load — and short material means stopping work while you wait for another truck.

The calculator also converts between cubic yards (how aggregate is sold and delivered) and tons (how some suppliers price material), using the compacted unit weight for each material type. Standard unit weights are built in, or you can enter a custom weight from your supplier's gradation report.

Pro Tip: Always order 10-15% more aggregate than the calculated loose volume to account for spillage, spreading losses, and subgrade irregularities. It is far cheaper to have a small surplus on site than to pay a minimum delivery charge for a short load. On large jobs, do a test compaction with a nuclear density gauge on the first lift to verify that your actual shrink factor matches the assumed value.

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Aggregate Compaction Shrink Calculator
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How It Works

  1. Enter Compacted Volume

    Input the finished (compacted-in-place) volume in cubic yards or cubic feet. This is the volume shown on the plans or calculated from the area and compacted thickness of the aggregate layer.

  2. Select Aggregate Type

    Choose the material: crusher run/DGA, 3/4" clean stone, 2" clean stone, pea gravel, sand, topsoil, recycled concrete, or custom. Each material has a default shrink factor and unit weight based on industry averages.

  3. Review Loose Volume and Tonnage

    Check the loose volume to order (compacted volume divided by the compaction factor), the tonnage equivalent, and the number of standard dump truck loads (typically 12-15 cubic yards per tandem axle). Verify the unit weight with your supplier if their material differs from the default.

  4. Add Waste Factor

    Apply a 10-15% waste/overage factor to the loose volume to account for site losses. The calculator shows the final order quantity in both cubic yards and tons.

Built For

  • Hardscape contractors ordering base material for paver patios, walkways, and retaining wall foundations
  • Excavation crews estimating backfill quantities for utility trench restoration and site grading
  • General contractors verifying aggregate quantities on site work subcontractor bids
  • Estimators converting between compacted cubic yards on plans and loose cubic yards or tons for material purchase orders

Features & Capabilities

Material-Specific Shrink Factors

Built-in shrink factors for common aggregates: crusher run 20-25%, clean stone 5-10%, sand 10-15%, recycled concrete 15-25%, and topsoil 15-20%. Custom factors can be entered for specialty materials or when your supplier provides a specific value.

Tonnage Conversion

Converts between cubic yards and tons using the compacted unit weight for each material type. Crusher run at approximately 2,700 lbs/CY compacted, clean stone at 2,500 lbs/CY, sand at 2,600 lbs/CY. Custom weights accepted.

Truck Load Calculator

Divides the total loose volume by standard truck capacities: single-axle dump (6-8 CY), tandem-axle dump (12-15 CY), and tri-axle dump (16-18 CY) to estimate the number of deliveries needed.

Waste Factor Adjustment

Applies a configurable waste/overage percentage (default 10%) to the calculated loose volume to account for spillage, subgrade irregularities, and spreading losses that always occur on real jobsites.

Frequently Asked Questions

The shrink factor (also called compaction factor) is the percentage by which aggregate volume decreases when compacted from its loose (as-delivered) state to the specified density. A 20% shrink factor means that 1.25 cubic yards of loose material compacts down to 1.0 cubic yard in place. You need to order more loose material than the finished volume because compaction eliminates air voids between particles. The shrink factor depends on the material gradation, moisture content, and compaction method.
Multiply the volume in cubic yards by the unit weight in pounds per cubic yard, then divide by 2,000 to get tons. Common unit weights (compacted): crusher run is about 2,700 lbs/CY (1.35 tons/CY), clean stone is about 2,500 lbs/CY (1.25 tons/CY), and sand is about 2,600 lbs/CY (1.30 tons/CY). These values vary by source and moisture content, so confirm with your supplier if precision matters for cost estimates.
For pedestrian applications (patios, walkways), ICPI recommends a minimum 6-inch compacted base of dense-graded aggregate over properly prepared subgrade. For vehicular applications (driveways, parking areas), the base should be 8-12 inches compacted depending on soil conditions and traffic loading. In areas with frost, the total base depth should extend to the frost depth. Over clay soils, consider adding a geotextile separation fabric between the subgrade and the aggregate base.

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