Cubic Yard Calculator

Free Online Cubic Yard Calculator

This cubic yard calculator turns the length, width, and depth of any area into the number of cubic yards of material you need to order. It works for concrete, mulch, topsoil, gravel, sand, compost, riverrock, or any other bulk material sold by the yard. Type in your measurements in feet, inches, or yards, set a depth, and the calculator instantly shows the raw volume, a waste-adjusted amount, a practical order size rounded to the nearest half yard, and an estimated cost if you know the price per yard.

Bulk material suppliers, ready-mix concrete plants, and landscaping yards all sell by the cubic yard, not by the bag or by square footage, so getting this number right before you call in an order saves you from a wasted delivery trip or a job that runs out of material halfway through.

What Is a Cubic Yard?

A cubic yard is a unit of volume equal to a cube measuring 3 feet on every side — 3 feet long, 3 feet wide, and 3 feet deep. That works out to 27 cubic feet (3 × 3 × 3), which is the conversion number this calculator uses behind the scenes. A cubic yard is roughly the amount of loose material that fits in a large wheelbarrow load repeated about 9 to 14 times, or about what a small pickup truck bed can hold when loaded level.

Because most yards and job sites are measured in feet and inches rather than yards, the real work in a cubic yard calculation is converting your length, width, and depth into a consistent unit before multiplying — which is exactly what this tool automates.

Cubic Yard Formula

The math behind this calculator is simple once every measurement is in feet. Here's the formula:

• Cubic Feet = Length (ft) × Width (ft) × Depth (ft)
• Cubic Yards = Cubic Feet ÷ 27
• If depth is measured in inches: Depth (ft) = Depth (in) ÷ 12
• Cubic Yards with Waste = Cubic Yards × (1 + Waste % ÷ 100)
• Total Cost = Cubic Yards (rounded to order size) × Price per Cubic Yard

How to Use This Calculator

Measure the length and width of the area you're covering and enter them, choosing whether you measured in feet, inches, or yards. Then enter the depth of material you plan to lay down — depth is almost always measured in inches for mulch, gravel, and topsoil, and often in inches for a concrete slab too. Add a waste allowance if you want a safety margin (10% is a common default for landscaping materials, and concrete pours often add a smaller allowance for spillage and uneven subgrade). If you have a quoted price per cubic yard, enter it to see your estimated total cost. Every result updates instantly, and the step-by-step panel shows exactly how the final number was calculated.

Worked Example

Say you're covering a garden bed that's 12 feet long and 8 feet wide with 3 inches of mulch. First, convert the depth to feet: 3 in ÷ 12 = 0.25 ft. Multiply the three dimensions: 12 × 8 × 0.25 = 24 cubic feet. Divide by 27 to get cubic yards: 24 ÷ 27 = 0.89 cubic yards. Add a 10% waste allowance for settling and spillage: 0.89 × 1.10 ≈ 0.98 cubic yards. Rounded up to the nearest half yard, you'd order 1.0 cubic yard of mulch. At $45 per cubic yard, that's a total cost of about $45.

Cubic Yards for Common Materials

The formula stays the same no matter what you're ordering, but the depth you plug in usually depends on the material and the job. Here are typical depths used in real projects:

• Concrete slabs and driveways: usually 4 inches deep for a standard patio or walkway, and 5 to 6 inches for a driveway that will carry vehicle weight.
• Mulch: 2 to 4 inches for flower beds and tree rings; a fresh application on bare soil often uses 3 inches.
• Topsoil and garden soil: 4 to 8 inches for a new garden bed or raised bed fill, and 1 to 2 inches for a light top-dressing over an existing lawn.
• Gravel and crushed stone: 2 to 4 inches for a decorative or walking path, and 4 to 6 inches for a driveway base course.
• Sand: 1 to 2 inches for leveling under pavers, and up to 4 to 6 inches when filling a play area or sandbox.
• Compost: 1 to 3 inches when top-dressing soil, or up to 6 inches when working it into a new bed.

How Much Does a Cubic Yard Weigh?

Weight matters if you're arranging delivery, renting a trailer, or figuring out how many truckloads a job needs, and it varies a lot by material because density is different for every product:

• Concrete (wet, mixed): roughly 3,700 to 4,050 pounds per cubic yard.
• Topsoil: roughly 2,000 to 2,700 pounds per cubic yard, depending on moisture content.
• Mulch (bark or wood chips): roughly 400 to 800 pounds per cubic yard — much lighter than soil or stone.
• Gravel and crushed stone: roughly 2,400 to 2,900 pounds per cubic yard.
• Sand: roughly 2,600 to 3,000 pounds per cubic yard.
• These are general averages — always confirm with your supplier, since moisture content and material grade shift the actual weight.

Why a Waste Allowance Matters

The raw cubic yard number from length × width × depth assumes a perfectly flat, perfectly even area with zero material loss, which almost never happens on a real job site. Ground isn't perfectly level, material compacts once it's spread and walked on, some spills off the edge of a delivery pile, and grading rarely comes out exactly to plan. That's why most contractors and landscapers add 5% to 15% on top of the calculated volume before ordering.

A smaller allowance (around 5%) usually works for a flat, well-prepared surface like a poured concrete slab. A larger allowance (10% to 15%) is safer for uneven ground, loose materials like mulch or gravel, or any job where the exact depth is likely to vary across the area. It's almost always cheaper to have a little material left over than to pay for a second delivery because you ran short.

Cubic Yards vs. Cubic Feet vs. Square Feet

These three units get mixed up constantly, so it helps to keep the difference clear. Square feet measures area only — length × width — with no depth involved, which is what you'd use to price flooring or paint coverage. Cubic feet adds depth to that area, giving you a true volume, but it's a small unit that produces big, unwieldy numbers for large jobs. Cubic yards is simply cubic feet divided by 27, giving you a more practical number for ordering bulk material, since suppliers price and deliver by the yard, not by the cubic foot.

A quick way to remember it: if a supplier only gives you a square footage and a target depth, you still need this calculator to turn that into cubic yards before you can place an order.

Common Mistakes When Calculating Cubic Yards

A few errors show up again and again when people calculate this by hand:

• Mixing units — entering length and width in feet but depth in inches without converting first, which throws the whole answer off by a factor of 12.
• Forgetting depth entirely and only calculating square footage, then guessing at the material amount.
• Skipping the waste allowance and ordering the exact bare-minimum volume, which often leads to a short delivery.
• Not rounding up to the supplier's minimum order or delivery increment, which can mean an awkward second trip for a small leftover amount.
• Measuring an irregular area as one single rectangle instead of breaking it into smaller rectangular sections and adding the cubic yards together.

Where This Calculator Is Used

Cubic yard calculations come up across construction, landscaping, and DIY projects:

• Concrete contractors use it to order ready-mix concrete for slabs, footings, driveways, and sidewalks.
• Landscapers and homeowners use it for mulch, topsoil, compost, and garden bed fill.
• Excavation and grading crews use it to estimate how much fill dirt or gravel a site needs, or how much spoil needs to be hauled away.
• Hardscaping crews use it for the sand and gravel base layers under pavers, patios, and retaining walls.
• Anyone renting a dump truck, trailer, or delivery service uses it to figure out how many loads a project will take.