Crusher Run Calculator

What Is Crusher Run?

Crusher run is a compactable base material made from crushed stone mixed with stone dust and fines. It is commonly used under driveways, walkways, patios, slabs, and other surfaces where a firm, load-bearing base is needed.

Because it contains both larger aggregate and fine particles, crusher run locks together tightly when compacted. That makes it very different from loose decorative gravel, which shifts more easily under traffic.

Crusher Run vs Other Base Materials

Why Crusher Run Is Used for Base Layers

Crusher run is one of the most common base materials because it provides both stability and compaction. The larger stone pieces create structural strength, while the fines fill voids and reduce movement. This helps prevent rutting, shifting, and settlement under repeated traffic.

For that reason, crusher run is widely used for:

• Driveway base layers
• Paver patios and walkways
• Shed pads and equipment pads
• Parking areas
• General subgrade improvement

How Crusher Run Quantity Is Calculated

Crusher run volume is calculated using:

Volume = Area × Depth

The calculators above estimate area based on the selected shape, including straight paths, curved paths, circular areas, rings, and rectangles. That volume is then converted into cubic yards, cubic feet, or cubic meters, and finally into weight using density.

Typical Crusher Run Depth by Project

Crusher Run Density and Weight

Crusher run typically has a density around 1,600 to 1,800 kg/m³ depending on stone type, moisture, and how tightly the material is compacted. A default value of 1,700 kg/m³ is a practical estimate for general calculations.

Keep in mind that suppliers often sell crusher run by the ton, not just by cubic yard. If your supplier provides a known tons-per-yard conversion, use the manual density override for better accuracy.

Important Installation Tips

• Excavate topsoil and soft material before installing crusher run
• Install in layers rather than placing the full depth at once
• Compact each layer thoroughly with a plate compactor or roller
• Maintain slope for drainage, especially on driveways
• Use edging where needed to help contain the base
• Order extra material to account for compaction and uneven grade

Common Mistakes When Using Crusher Run

• Using too little depth for vehicle traffic
• Skipping compaction between lifts
• Installing over wet or unstable soil
• Using crusher run where open drainage stone is actually required
• Assuming loose delivered volume equals finished compacted volume

When Crusher Run Is Not the Best Choice

Crusher run is excellent for compacted bases, but it is not ideal where maximum drainage is required. For example, French drains and some drainage trenches usually perform better with open-graded stone like #57 stone because the fines in crusher run reduce water flow.

FAQs

Is crusher run good for a driveway?

Yes. Crusher run is one of the most common driveway base materials because it compacts tightly and holds up well under vehicle loads.

How much crusher run do I need?

That depends on your project length, width, shape, and finished depth. Use the calculator above to estimate total volume and weight for your exact layout.

What is the difference between crusher run and gravel?

Crusher run contains fines and compacts tightly, while gravel is often cleaner and looser. That makes crusher run better for bases and gravel better for some drainage or decorative uses.

How much extra crusher run should I order?

Ordering 5–10% extra is common because crusher run settles during compaction and because site grades are rarely perfectly uniform.