Crush and Run Calculator

Estimate Your Crush and Run Needs

Calculate the amount of crush and run gravel required for your project.

Understanding the Results

Material	Typical Density (lbs/cu ft)	Typical Density (kg/cu m)
Crush and Run / Crusher Run	110 – 140	1760 – 2240
Gravel (loose, dry)	90 – 105	1440 – 1680
Sand (dry)	90 – 110	1440 – 1760
Compacted Soil	100 – 130	1600 – 2080

Typical densities of common base materials. Check with your supplier for the exact density of your crush and run.

What is a Crush and Run Calculator?

A Crush and Run Calculator is a tool designed to help you estimate the amount of crush and run material (also known as crusher run, ABC stone, or dense grade aggregate) needed for a project like a driveway, walkway, patio base, or road base. It takes the dimensions of your area (length, width, and depth) and accounts for the compaction that occurs when the material is laid and packed, giving you the volume and weight of loose material you’ll need to purchase.

This calculator is essential for homeowners, landscapers, and contractors to avoid over-ordering or under-ordering material, saving time and money. Using a Crush and Run Calculator ensures you have enough material to achieve the desired compacted depth for a stable and long-lasting base.

Common misconceptions include thinking the volume of the hole is the amount to order; however, crush and run compacts significantly, so you need more loose material than the final compacted volume. Our Crush and Run Calculator accounts for this.

Crush and Run Calculator Formula and Mathematical Explanation

The Crush and Run Calculator uses the following steps:

1. Calculate Area: Area (sq ft) = Length (ft) × Width (ft)
2. Calculate Compacted Volume: Compacted Volume (cu ft) = Area (sq ft) × (Depth (inches) / 12)
3. Calculate Loose Volume: Loose Volume (cu ft) = Compacted Volume (cu ft) × (1 + Compaction Factor / 100)
4. Calculate Weight: Weight (lbs) = Loose Volume (cu ft) × Density (lbs/cu ft)
5. Convert Weight to Tons: Weight (tons) = Weight (lbs) / 2000
6. Calculate Cost (Optional): Cost = Weight (tons) × Cost per Ton ($)

The compaction factor is crucial as it represents the additional volume of loose material needed to achieve the desired compacted thickness.

Variable	Meaning	Unit	Typical Range
Length	Length of the area	feet	1 – 500+
Width	Width of the area	feet	1 – 100+
Depth	Desired compacted thickness	inches	2 – 12
Compaction Factor	Extra material for compaction	%	15 – 30
Density	Weight per unit volume of loose material	lbs/cu ft	110 – 140
Cost per Ton	Price per US ton	$	15 – 50+

Practical Examples (Real-World Use Cases)

Example 1: Driveway Base

You are building a driveway that is 50 feet long and 12 feet wide, and you need a 6-inch compacted base of crush and run. You estimate a 25% compaction factor, and your supplier says the crush and run weighs 125 lbs/cubic foot and costs $30 per ton.

• Length: 50 ft
• Width: 12 ft
• Depth: 6 inches
• Compaction: 25%
• Density: 125 lbs/cu ft
• Cost: $30/ton

Using the Crush and Run Calculator:

• Area: 600 sq ft
• Compacted Volume: 300 cu ft (11.11 cu yards)
• Loose Volume: 375 cu ft (13.89 cu yards)
• Total Weight: 46,875 lbs (23.44 tons)
• Estimated Cost: $703.13

You would need to order approximately 23.5 tons or 14 cubic yards of crush and run.

Example 2: Patio Base

You are preparing a base for a 15 ft by 10 ft patio, requiring a 4-inch compacted layer. You assume 20% compaction and a density of 120 lbs/cu ft. The cost is $35 per ton.

• Length: 15 ft
• Width: 10 ft
• Depth: 4 inches
• Compaction: 20%
• Density: 120 lbs/cu ft
• Cost: $35/ton

The Crush and Run Calculator estimates:

• Area: 150 sq ft
• Compacted Volume: 50 cu ft (1.85 cu yards)
• Loose Volume: 60 cu ft (2.22 cu yards)
• Total Weight: 7,200 lbs (3.6 tons)
• Estimated Cost: $126.00

You would need about 3.6 tons or 2.25 cubic yards.

How to Use This Crush and Run Calculator

1. Enter Dimensions: Input the Length and Width of the area in feet, and the desired compacted Depth in inches.
2. Set Compaction Factor: Enter the expected compaction percentage. This is how much the material will reduce in volume when compacted. 20-25% is common for crush and run.
3. Input Density: Enter the density of the loose crush and run material in pounds per cubic foot (lbs/cu ft). If unsure, 120-130 is a reasonable estimate, but check with your supplier.
4. Add Cost (Optional): If you know the cost per ton, enter it to get a cost estimate.
5. Calculate: The calculator automatically updates, or you can click “Calculate”.
6. Review Results: The calculator shows the total loose volume (in cubic feet and cubic yards) and total weight (in pounds and tons) of crush and run you need to order. It also shows the area, compacted volume, and estimated cost if a price was entered.

When ordering, it’s often wise to round up slightly (e.g., to the nearest half ton or half cubic yard) to ensure you have enough material.

Key Factors That Affect Crush and Run Calculator Results

• Dimensions (Length, Width, Depth): These directly determine the final compacted volume. Accurate measurements are crucial.
• Compaction Factor: This is vital. Crush and run is loose when delivered and compacts significantly. Underestimating compaction means you’ll run short. It depends on the material type and compaction method.
• Material Density: The weight of the material per unit volume. Denser materials mean more weight for the same volume. Always ask your supplier for the loose density.
• Moisture Content: The density can vary slightly with moisture content. The values used are typically for relatively dry material.
• Subgrade Condition: A very soft subgrade might require a slightly thicker base or allow more initial settling, indirectly affecting the amount used.
• Ordering Units: Suppliers sell crush and run by weight (tons) or volume (cubic yards). Our Crush and Run Calculator provides both. Ensure you order using the unit your supplier uses.
• Waste: Always factor in a small percentage for waste due to spillage or uneven spreading (5-10%). The calculator gives the net amount needed based on dimensions and compaction.

Frequently Asked Questions (FAQ)

What is crush and run?

Crush and run (or crusher run) is a type of gravel mix that includes coarse and fine aggregates (stone dust and small stones). This mix allows it to compact very tightly, forming a stable and durable base for driveways, roads, patios, and retaining walls.

How much does crush and run compact?

It typically compacts by 15% to 30% of its loose volume, depending on the material composition and the compaction equipment used. Our Crush and Run Calculator uses a compaction factor to account for this.

How deep should my crush and run base be?

For pedestrian traffic (walkways, patios), 3-4 inches is often sufficient. For driveways with light vehicles, 4-6 inches is common. For heavy vehicles or poor soil, 8-12 inches or more might be needed. Check local building codes or consult a professional.

What is the difference between crush and run and gravel?

Crush and run is a specific mix of crushed stone and stone dust designed for compaction. “Gravel” is a broader term and can refer to various types of loose stone, some of which (like pea gravel) do not compact well.

How much does a ton of crush and run cover?

It depends on the depth and density. For example, 1 ton of crush and run at 120 lbs/cu ft (2000 lbs) is about 16.67 cu ft. Spread 4 inches deep (0.333 ft), it would cover about 50 sq ft (16.67 / 0.333) *before* compaction.

Can I use this calculator for other materials?

Yes, if you know the loose density and expected compaction factor for other materials like base rock or sand, you can input those values into the Crush and Run Calculator.

Should I order by tons or cubic yards?

Check with your supplier. Some sell by weight (tons), others by volume (cubic yards). Our Crush and Run Calculator provides both, but ensure you order in the units your supplier uses to avoid confusion.

Is it better to overestimate or underestimate?

It’s generally better to overestimate slightly (5-10%) to account for waste, uneven spreading, and slight variations in density or compaction. Running out of material mid-project can be costly and cause delays.