How calculations work

Get a usable material estimate in three steps: measure the project, enter the required depth, and review the order quantity. Every calculator runs directly in your browser and shows its basic method.

Area is not volume

A square foot measures area. A cubic foot measures volume. To estimate volume, multiply area (square feet) by depth (feet). If depth is in inches, divide by 12 first.

Convert cubic feet to cubic yards

There are exactly 27 cubic feet in one cubic yard. If a project measures 108 cubic feet, its volume is 4 cubic yards.

Bag counts are rounded up

Concrete bags are whole packages. Divide the adjusted concrete volume by the manufacturer's stated bag yield and round up. A manufacturer's yield may differ by concrete product even when bag weights match.

Extra material and compaction

Extra material is optional and editable. For driveway gravel, a separate compaction allowance may be entered. These are not structural specifications; check the order assumptions with your supplier.

Tons require material density

Volume cannot be converted accurately to weight without knowing density. Our gravel tools use US short tons (2,000 lb) and an editable short-tons-per-cubic-yard factor. The default is an illustrative value, not a verified density for your supplier.

Before purchasing

Re-measure the site, confirm depth and product yields, compare ordering units with the supplier, and account separately for delivery charges, taxes, grading, reinforcement and labor. These calculators do not replace local engineering requirements or professional estimates.