About Us

Gravel Calculator helps you order gravel and crushed stone with one free tool and a short shelf of guides on quantity, stone choice and depth.

The tool and the guides

The gravel calculator turns an area and a depth into cubic yards, cubic meters, US tons, tonnes and bags. It handles rectangles, circles, triangles, a known area and a trench with a pipe, up to three layers of different stone, and the extra stone a compacted layer needs. Every guide shows the arithmetic in plain sentences, so you can redo a result with a pencil and a tape measure.

Where the stone figures start

Stone weights come from state transportation departments such as Washington State DOT and Caltrans, and from Federal Highway Administration lab work. Depths and layer rules come from building codes, FHWA's gravel roads guide, extension services and makers' installation guides. Unit conversions follow NIST. Where no agency publishes a figure, as with pea gravel and river rock, the page says the number is an estimate and what it is based on. Prices are not covered.

Review before a guide goes live

A guide is drafted from the agency and maker documents above, and a second reader then compares each figure with those documents. Each worked order is reworked from the tape measurements up. A stone weight or depth must read the same on every guide and in the calculator, since the tool uses the formulas the guides spell out.

Limits

Gravel Calculator is not a supplier, a contractor, an engineer or a building department. Code rules and structural questions belong with your local building department, and your quarry's own figures beat any planning number.

Reporting an error

Spotted a weight, depth or result that seems off? Send the page and the figure to admin@gravelcalculatr.com. The figure is traced back to its document, and the page is corrected if it is wrong.