Gravel path calculator

A gravel path is calculated the same way as any bulk material bed, length times width for area, then area times depth for volume, but paths have two details that beds do not: they often need a compacted base layer under the decorative top layer, and their narrow, long shape makes measuring easier to get wrong than a simple rectangle bed.

One layer or two

A simple path over existing soil, mainly meant to define a walking route through a garden bed, is often just one layer of decorative gravel 2 to 3 inches deep over landscape fabric. A path that will see regular foot traffic, connect to a driveway, or needs to stay firm in wet weather usually gets a compacted base layer first, typically 3 to 4 inches of crushed angular gravel that locks together when tamped, topped with 1 to 2 inches of a decorative gravel like pea gravel or 3/4 inch stone. Each layer is calculated separately using its own depth, then the two volumes are added for a total material order, though they are usually two separate deliveries since the base and top gravel differ in size and sometimes color.

Measuring a path accurately

Paths are rarely a perfect rectangle end to end. A path that curves or changes width should be measured in shorter straight segments, each treated as its own small rectangle, then added together, which is exactly the multi zone approach the calculator on this site supports. Measure width at a few points along the path rather than just once, since hand dug or informally edged paths often vary by a few inches from one end to the other.

Depth by path type

A decorative only path, no base layer, over fabric: 2 to 3 inches. A single layer functional path expected to handle regular walking: 3 to 4 inches of a compactable angular gravel. A two layer path with a base and decorative top: 3 to 4 inches base plus 1 to 2 inches top, calculated and ordered separately.

Worked example

A path 40 feet long and 3 feet wide is 120 square feet. At 3 inches deep, one cubic yard covers about 108 square feet, so 120 divided by 108 comes out to roughly 1.1 cubic yards for a single layer path, a size where checking a supplier's delivery minimum before ordering is worthwhile.

Edging keeps material in place

Gravel paths without a physical edge, whether metal, plastic, stone, or timber, tend to spread into surrounding beds or lawn over time as foot traffic and rain push loose stone outward. Edging is not part of the volume calculation, but it is worth planning before ordering gravel, since it protects the investment in material by keeping it where it was placed.

Calculate your path

The gravel and mulch calculator supports multiple zones for exactly this kind of segmented path measurement, and returns cubic yards and weight for any gravel type you choose, base or decorative.

Gravel Path Coverage by Depth

Use this table to estimate how far 1 cubic yard of gravel will cover at common walkway depths.

Depth	Typical layer	1 cu yd covers
1 in	Top gravel	324 sq ft
2 in	Top layer	162 sq ft
3 in	Light path	108 sq ft
4 in	Base layer	81 sq ft
6 in	Two layers	54 sq ft

Divide your path area by the coverage number for each depth, and calculate base gravel and top gravel separately.