Cubic Yards Calculator

A cubic yard is a unit of volume equal to a cube that measures 3 feet on each side: 3 ft × 3 ft × 3 ft. That works out to 27 cubic feet total. It's the standard unit used in the U.S. for measuring bulk materials like concrete, fill dirt, mulch, gravel, and sand.

To put it in perspective, one cubic yard is roughly the size of a standard washing machine. It doesn't sound like much, but a single cubic yard of wet concrete weighs around 4,000 pounds, so it adds up fast on large projects.

You'll hear the term constantly on job sites and at landscaping supply yards. Most suppliers price materials per cubic yard, which is why getting your calculation right before you order matters.

The basic process has three steps. Measure the length, width, and depth of the area you need to fill, convert all measurements to feet if they aren't already, then multiply them together and divide by 27.

1. Measure the length of your space in feet.
2. Measure the width of your space in feet.
3. Measure the depth (or thickness) in feet. If your depth is in inches, divide by 12 to convert.
4. Multiply: Length × Width × Depth to get cubic feet.
5. Divide that result by 27 to get cubic yards.

The depth step trips people up the most. A 4-inch depth, for example, is 4 ÷ 12 = 0.333 feet. Skipping that conversion is the most common mistake people make when estimating materials.

The formula is straightforward:

Cubic Yards = (Length × Width × Depth) ÷ 27

All three dimensions need to be in feet before you multiply. The result of that multiplication is cubic feet (ft³). Dividing by 27 converts it to cubic yards because there are exactly 27 cubic feet in one cubic yard.

If you already know the volume in cubic feet, you just divide that number by 27 and you're done. For example, 54 cubic feet ÷ 27 = 2 cubic yards. Simple as that.

It's a good idea to add about 10 percent to your final number when ordering materials. Spillage, settling, and uneven surfaces mean you almost always need a little more than the bare calculation suggests.

Sometimes you already know the area in square feet and just need to factor in the depth. This is called the depth method, and it's really common when working from blueprints or property surveys.

The formula looks like this:

Cubic Yards = (Square Feet × Depth in inches) ÷ 324

The number 324 comes from multiplying 12 (inches per foot) by 27 (cubic feet per cubic yard). It's a shortcut that lets you skip the inch-to-foot conversion step.

So if you have a patio area of 200 square feet and you want to pour a 4-inch concrete slab, the calculation is: 200 × 4 ÷ 324 = 2.47 cubic yards. Round up to 2.5 or even 3 to give yourself a buffer.

This method works well for any flat, uniform area. For irregular shapes, break the space into rectangles or triangles, calculate each section separately, and then add the totals together.

Seeing the formula in action makes it easier to apply. Here are a few practical examples covering typical home and landscaping projects.

• Garden bed (10 ft × 6 ft × 4 in deep): Convert depth to feet: 4 ÷ 12 = 0.333 ft. Multiply: 10 × 6 × 0.333 = 20 cubic feet. Divide: 20 ÷ 27 = 0.74 cubic yards.
• Driveway gravel (40 ft × 12 ft × 6 in deep): Depth in feet: 6 ÷ 12 = 0.5 ft. Multiply: 40 × 12 × 0.5 = 240 cubic feet. Divide: 240 ÷ 27 = 8.89 cubic yards. Order 9 to 10.
• Concrete slab (20 ft × 20 ft × 4 in deep): Depth: 0.333 ft. Multiply: 20 × 20 × 0.333 = 133.3 cubic feet. Divide: 133.3 ÷ 27 = 4.94 cubic yards. Round up to 5.5 with waste factor.
• Mulch for a tree ring (8 ft diameter circle, 3 in deep): Area of circle = π × r² = 3.14 × 16 = 50.3 sq ft. Depth: 3 ÷ 12 = 0.25 ft. Volume: 50.3 × 0.25 = 12.6 cubic feet. Divide: 12.6 ÷ 27 = 0.47 cubic yards.

These examples cover most common scenarios. Your measurements will vary, but the process stays exactly the same every time.

Quick reference conversions can save a lot of back-and-forth math, especially on the job site. This chart covers the most useful relationships.

The cubic feet to cubic yards relationship (27 cubic feet = 1 cubic yard) is the one you'll use most. The others come up less often but are handy when working with metric measurements or liquid volumes.

Cubic yard calculations show up in a huge range of projects. Knowing the volume you need is the first step in getting an accurate quote from a supplier or contractor.

• Concrete: Driveways, foundations, sidewalks, and slabs are all estimated in cubic yards. Ready-mix concrete is ordered by the yard, and short loads often carry a surcharge.
• Mulch and compost: Bulk mulch and compost are sold by the cubic yard at most garden centers and landscape supply companies. Buying in bulk is almost always cheaper per cubic yard than buying bagged.
• Topsoil: Grading a yard, filling raised beds, or establishing a new lawn all require topsoil estimates in cubic yards.
• Gravel and crushed stone: Base layers for driveways, patios, and drainage areas are measured in cubic yards. Depth matters a lot here since a thicker base requires significantly more material.
• Sand: Used under pavers, in sandboxes, or for leveling, sand is another bulk material priced and delivered by the cubic yard.
• Fill dirt: Leveling low spots or building up grade around a foundation requires fill dirt, which is typically quoted and hauled in cubic yards or cubic yards per truckload.

Getting the cubic yardage right before you call a supplier means you're having a much more productive conversation. You won't overbuy and waste money, and you won't find yourself short on pour day.

The cubic yard became the standard for bulk materials in the U.S. largely because it scales well for construction. A single cubic yard is big enough to be a practical unit for truck loads and project estimates, but not so large that small jobs become awkward to calculate.

Contractors, suppliers, and landscapers have used cubic yards for generations. Equipment like dump trucks, concrete mixers, and front-end loaders are all sized and rated with cubic yards in mind. A standard dump truck holds roughly 10 to 14 cubic yards of material, which makes logistics straightforward when you know your volume.

There's also a consistency benefit. Because the whole supply chain uses the same unit, there's less room for miscommunication when a contractor orders material, a supplier quotes a price, and a driver loads a truck. Everyone's talking the same language.

Outside the U.S., cubic meters are more common, but for domestic projects and American suppliers, cubic yards are what you'll be working with. Once you get comfortable converting your measurements and running the basic formula, estimating material quantities becomes second nature.