Cubic Yards vs. Bags: How to Order Landscaping Materials

Bagged is easy. Bulk is cheap. Here is exactly where the line sits for mulch, topsoil and gravel — and how to measure so you order the right amount either way.

Mulch, topsoil, sand and gravel are all sold two ways: in bags off a pallet, or loose by the cubic yard off a truck. Bags are simple to haul and store. Bulk is dramatically cheaper per unit and faster to place on a big job. Knowing when to switch saves real money.

What a cubic yard actually is

A cubic yard is a cube three feet on each side: 3 × 3 × 3 = 27 cubic feet. That single number unlocks all the conversions. Because a standard mulch bag holds 2 cubic feet, one cubic yard equals 13.5 bags. Topsoil in 1 cubic foot bags? Twenty-seven bags to the yard. Once you picture the 27, the rest is arithmetic.

How to measure a bed or area

The volume of any flat area is length × width × depth, with depth converted to feet (inches ÷ 12). For a round bed, area is π × radius². A worked example: a 20 by 15 foot bed at 3 inches of mulch is 20 × 15 × 0.25 = 75 cubic feet, which is 2.8 cubic yards or about 38 bags. Our mulch calculator, topsoil calculator and gravel calculator all do this for you and show bags and yards together.

The break-even: when bulk wins

Bags carry a big convenience markup. As a rule of thumb, once you need more than 8 to 10 bags — a bit under a cubic yard — bulk delivery usually costs less overall, even after the delivery fee. Do the quick comparison:

• Bagged cost = number of bags × price per bag.
• Bulk cost = cubic yards × price per yard + delivery.

Plug your local prices in. On a 3 cubic yard mulch job, bags might run 40 units at four dollars each ($160) versus three yards at thirty-five plus a fifty-dollar delivery ($155) — and you skip opening and hauling 40 bags. The gap widens fast as the job grows.

What bulk delivery is really like

Bulk means a pile dumped on your driveway. You need somewhere it can sit, a way to move it (a wheelbarrow and a strong afternoon), and ideally a tarp if rain is coming. Suppliers usually have a minimum — often 1 to 3 cubic yards — and charge for delivery by distance. If you cannot take a pile, or the job is genuinely small, bags remain the sensible choice.

Material-by-material notes

• Mulch fluffs in the bag and settles once down; buy about 10 percent extra and keep it a few inches off stems. See the mulch calculator.
• Topsoil is heavy — roughly 1.1 tons per cubic yard — so check your trailer’s rating before you haul bulk. See the topsoil calculator.
• Gravel is sold by the ton as often as the yard; at about 1.4 tons per yard the two convert cleanly. See the gravel calculator.

Two mistakes that cause a second trip

First, confusing cubic feet with cubic yards — ordering 75 when you meant 2.8 is a 27-times error. Second, forgetting waste and settling; natural beds have ragged edges and loose material compacts. Add 10 percent and round up. A little left over beats coming up short with the truck already gone.

Prices and densities are illustrative and vary by region and supplier. Confirm current pricing, delivery minimums and material density locally before ordering.