How deep should mot type 1 be for a path?

75mm, which is 3 inches. Mainland Aggregates: path sub-bases should be 75mm depth.

How deep should aggregate be for a path?

40 to 50mm, which is 1.6 to 2 inches. Mainland Aggregates: 20mm gravel should be laid at no more than 40 to 50mm depth.

How deep should gravel be for a path?

40 to 50mm, which is 1.6 to 2 inches. Mainland Aggregates: no more than 40 to 50mm on paths and driveways.

How deep should pea gravel be for a path?

51 to 76mm, which is 2 to 3 inches. Mr. Mulch: spread at a depth between 2 and 4 inches.

How deep should decomposed granite be for a path?

51 to 76mm, which is 2 to 3 inches. Earth Stone Rock: 2 to 3 inches for paths and patios.

How deep should a path be?

A path carries feet rather than cars, so both the sub-base and the surface are shallower than a driveway. That is the single biggest saving on a small job.

Published laid depths for a path, by material
Material	Depth	In inches	Where the depth comes from
MOT Type 1	75mm	3 in	Mainland Aggregates: path sub-bases should be 75mm depth.
Aggregate	40 to 50mm	1.6 to 2 in	Mainland Aggregates: 20mm gravel should be laid at no more than 40 to 50mm depth.
Gravel	40 to 50mm	1.6 to 2 in	Mainland Aggregates: no more than 40 to 50mm on paths and driveways.
Pea gravel	51 to 76mm	2 to 3 in	Mr. Mulch: spread at a depth between 2 and 4 inches.
Decomposed granite	51 to 76mm	2 to 3 in	Earth Stone Rock: 2 to 3 inches for paths and patios.

Working out the quantity once you have the depth

Multiply the area by the depth for a volume, then by the material's bulk density for a weight. Each calculator below does it in the units that material is sold in, and each shows the density range its figure came from.

Materials without a published depth for this use

No supplier read for this site publishes a laid depth for wood chip on a path, so none is stated here. Their calculators take whatever depth you enter.