Crushed Stone Calculator

When to use this calculator

Use this crushed stone calculator for driveway base, shed pads, walkway base, drainage stone, parking areas, and compacted hardscape layers. Crushed stone is angular and can lock together better than rounded gravel, but density and compaction vary by size and source.

• Planning driveway base or top-dress stone.
• Estimating compacted aggregate for patios, pavers, sheds, and walkways.
• Budgeting drainage stone around pipe, trenches, or low areas.
• Comparing supplier quotes by ton versus cubic yard.

Input guide

• Length and width are the covered area in feet.
• Depth is the planned stone layer in inches before or after compaction, depending on your supplier and project assumption.
• Waste factor covers edge loss, uneven subgrade, compaction, and rounding.
• Density should match your stone size and supplier; crushed limestone, granite, and recycled aggregate can differ.
• Price per ton should use the delivered or pickup price consistently.

Formula and estimation method

Step-by-step worked example

A 30 ft by 12 ft parking pad with 4 inches of crushed stone uses about 120 cubic feet, or 4.44 cubic yards before waste. With 10% waste, plan 4.89 cubic yards. At 1.45 tons per cubic yard, that is about 7.09 tons. At $48 per ton, material cost is about $340 before delivery or grading.

Before you order materials

Use the Crushed Stone Calculator result as a starting quantity, then convert it into the way your supplier actually sells the material. Some stores sell by bag, each, pallet, strap, ton, cubic yard, or delivered load. Ask whether the quoted price includes delivery, fuel surcharge, pallet deposit, short-load fee, tax, unloading limits, or return rules. For outdoor projects, also check access for trucks, where material can be staged, whether the ground is firm enough for delivery, and how long the work area can stay open if weather changes.

For a safer order, write down the measurements used in the calculator, the waste percentage, the product size or density, and the final rounded quantity. Bring those notes to the supplier or contractor so they can catch unit mistakes before money is spent. If the project affects drainage, support, vehicle traffic, steps, walls, posts, or anything inspected by code, treat the calculator as a planning aid and verify the final material list with a qualified local source.

Common mistakes to avoid

• Using decorative rounded rock instead of compactable angular base stone.
• Forgetting compaction, geotextile fabric, or poor subgrade conditions.
• Choosing depth without considering traffic, soil, drainage, and freeze-thaw conditions.
• Ignoring delivery truck access and dump location.
• Comparing suppliers without checking stone size, fines content, and moisture.

Planning notes and limitations

• Crushed stone with fines compacts differently from clean drainage stone.
• Driveway and parking areas often need more depth than decorative paths.
• Use lifts and compaction for thicker base sections.
• Ask suppliers whether density is loose, compacted, wet, or dry.

This calculator is a planning estimate. Follow local drainage, driveway, base, and compaction guidance, and consult a qualified contractor or engineer for load-bearing, erosion-prone, or code-regulated work.