We are planning a garden and plan to gravel the paths. I'm looking for a calculation to figure how many cubic yards we need. we have 389 sq feet to cover and would like it to be 3" in depth.

round 389 to 400, 3 inches = .25 feet 400 Sqft * .25 feet = 1000 Cubic feet. I got rock by the ton when it was delivered here. Soz but I have no idea on that conversion but it will also vary by the type of rock. -- Tim

A cubic yard is 27 cubic feet.. A yard of stone usually weighs just over a ton, which is what they charge by.

Four cubic yards. However, there may be a minimum delivery amount involved without paying an extra fee. Ken S. in WC TN

The formula we use for crushed gravel is L X W X Depth, all in feet, divided by 27, (27 cu. yards in a ton) times 1.5 For example: 36' x 36' x 4" 36 x 36 x .25= 324 324 divided by 27 = 12 12 x 1.5 = 18 ton For bankrun gravel use 1.75 as the multiplier. Hope this helps.....

Before putting down the gravel be sure to put a good weed/grass control barrier under it if you want to maintain a recognizable path. Otherwise it will just be a more firm place in the grass. Ken S. in WC TN