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Cubic yards, bags, tons and delivered cost for beds, paths and driveways.
Common US projects at a 3 inch depth.
Tap a preset in the calculator above to load a typical job, then adjust the numbers to match your site.
Starting points: 10 × 10 ft bed · 20 × 10 ft bed · 50 ft path, 3 ft wide · 20 × 10 ft gravel pad · 30 × 20 ft driveway base
See installed landscaping, gravel and hardscape prices for your area.
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Measure the bed, pick a depth that suits the material, then order slightly over.
Multiply length by width by depth in feet, then divide by 27 for cubic yards. A 10 × 10 ft bed at 3 inches needs about 2.8 cubic yards, or roughly 38 two-cubic-foot bags.
Thirteen and a half 2-cubic-foot bags make one cubic yard. Bulk delivery is usually cheaper once you pass two cubic yards.
Three inches controls weeds and holds moisture. More than four inches can starve roots and hold too much water, and mulch touching siding invites termites.
About 1.35 tons per cubic yard for 3/4 inch gravel, and closer to 1.4 tons for crushed stone base. Sand runs about 1.35 tons.
Four to six inches of compacted base for a residential driveway, in two lifts. A path needs 3 to 4 inches over landscape fabric.
Bulk is cheaper per cubic yard, typically 30 to 50 percent less than bagged mulch plus delivery. Bags win for small quantities and for carrying in a car.
Using the calculator defaults, 10 × 10 ft bed gives Cubic yards: 1.0 and Materials cost: $99, with a typical range $72 to $130. Change the waste allowance, material or thickness to match your site.
Using the calculator defaults, 30 × 20 ft driveway base gives Cubic yards: 7.8 and Materials cost: $436, with a typical range $283 to $619. Change the waste allowance, material or thickness to match your site.
The calculator converts area and depth into cubic yards. Gravel and mulch are sold by the cubic yard or by the bag: length × width × depth (in) ÷ 12 ÷ 27 gives cubic yards. A 2 inch mulch layer covers about 162 sq ft per yard; a 4 inch layer covers about 81 sq ft.
A 20 by 10 ft bed is 200 sq ft. At 2 inches deep that is 200 × 2 ÷ 12 = 33.3 cubic feet, or 1.23 cubic yards, about 1.35 with waste. At 4 inches it doubles to 2.47 cubic yards. Bagged mulch is sold by cubic feet, so divide by 2 if the bags are 2 cu ft.
About 1.23 cubic yards at 2 inches deep, or 2.47 at 4 inches, before a waste allowance.
About 13.5 bags of 2 cu ft, because a yard is 27 cubic feet.
2 to 3 inches is typical; more smothers weeds but can hold too much moisture against plants.
A driveway base usually needs 4 to 6 inches of compacted gravel; use the same formula with the depth.
Volume is arithmetic from area and depth; 1 cu yd = 27 cu ft. Mulch depth guidance follows common landscaping practice. · Last updated October 30, 2026 · Report a correction