How Many Cubic Feet Are in a Yard? Cubic Yard Conversion Guide

There are 27 cubic feet in one cubic yard. If you're buying mulch, topsoil, gravel, compost, concrete, or another bulk material, this is the conversion you'll use to move between cubic feet and cubic yards.

That sounds simple—and it is. The confusing part usually comes when a project is measured in square feet, the depth is given in inches, bags are labeled in cubic feet, and the landscape supplier sells the same material by the cubic yard.

This guide shows you how the conversion works and, more importantly, how to use it when buying material for an actual project.

Why Are There 27 Cubic Feet in a Cubic Yard?

One yard is 3 feet long. But a cubic yard measures volume, so you have to account for three dimensions: length, width, and height.

Imagine a box that is 3 feet wide, 3 feet long, and 3 feet tall. That box occupies exactly one cubic yard of space. Inside it are 27 individual one-foot-by-one-foot-by-one-foot cubes.

The conversion is based on volume, so it does not change depending on what fills the space. One cubic yard of mulch, soil, gravel, concrete, or air is still 27 cubic feet of volume.

A Yard, Square Yard, and Cubic Yard Are Not the Same

One of the most common mistakes is treating the word yard as if it always describes the same measurement.

When a landscape supplier says mulch or soil costs a certain amount “per yard,” they generally mean per cubic yard, because these materials are sold by volume.

Cubic Yards to Cubic Feet Conversion Formula

To convert cubic yards to cubic feet, simply multiply the number of cubic yards by 27.

Example: Convert 4 cubic yards to cubic feet

Multiply 4 by 27:

4 × 27 = 108 cubic feet

So 4 cubic yards = 108 cubic feet.

Cubic Feet to Cubic Yards Conversion Formula

To go in the opposite direction, divide the number of cubic feet by 27.

Example: Convert 81 cubic feet to cubic yards

Divide 81 by 27:

81 ÷ 27 = 3 cubic yards

So 81 cubic feet = 3 cubic yards.

Cubic Yard to Cubic Feet Conversion Chart

Use this quick-reference table when estimating material:

How Many Bags Make One Cubic Yard?

This is where knowing that a cubic yard contains 27 cubic feet becomes especially useful.

Bulk landscape materials are often sold by the cubic yard, while bagged mulch, soil, compost, and similar products are labeled in cubic feet. Divide 27 by the volume of one bag to find how many bags equal a cubic yard.

When buying whole bags, round fractional bag counts up. For example, you would need 14 two-cubic-foot bags to buy at least one cubic yard of material.

How many 2 cubic foot bags are in a yard?

Mathematically, 13.5 two-cubic-foot bags equal one cubic yard:

27 ÷ 2 = 13.5

Because stores sell complete bags, you would normally purchase 14 bags if you need at least a full cubic yard.

How Much Area Does One Cubic Yard Cover?

A cubic yard tells you the amount of material you have. The square footage it covers depends on how deeply you spread that material.

For example, one cubic yard spread 3 inches deep covers about 108 square feet. Spread that same material only 1 inch deep and it covers about 324 square feet.

How to Calculate Cubic Yards for Your Project

If you know the length, width, and desired depth of an area, you can calculate the cubic yards required yourself.

First make sure every measurement is in feet.

Example: 10 × 20 foot garden bed at 3 inches deep

The depth is given in inches, so convert 3 inches to feet first:

3 ÷ 12 = 0.25 feet

Now calculate the volume in cubic feet:

10 × 20 × 0.25 = 50 cubic feet

Finally, divide by 27:

50 ÷ 27 = about 1.85 cubic yards

So the project requires approximately 1.85 cubic yards before accounting for any extra material you choose to order.

Using Cubic Yards for Mulch

Mulch is one of the most common reasons homeowners need this conversion. Bagged mulch is frequently labeled in cubic feet, while landscape suppliers often sell bulk mulch by the cubic yard.

If your garden requires 54 cubic feet of mulch:

54 ÷ 27 = 2 cubic yards

If you were instead buying 2-cubic-foot bags, the same 54 cubic feet would equal:

54 ÷ 2 = 27 bags

That makes it easier to compare bagged and bulk options without comparing two different units.

Using Cubic Yards for Topsoil and Compost

Topsoil and compost are also commonly sold in bulk by the cubic yard. Measure the area you want to fill and determine the intended depth before ordering.

For example, adding 3 inches of material to a 200-square-foot bed requires:

200 × 0.25 = 50 cubic feet

50 ÷ 27 ≈ 1.85 cubic yards

Real soil and compost may settle after placement, so project planning can involve considerations beyond the basic volume conversion.

Using Cubic Yards for Gravel

Gravel suppliers may quote material by cubic yard, by weight, or both. The volume calculation itself still follows the same formula:

Cubic feet ÷ 27 = cubic yards

But don't assume one cubic yard has one fixed weight. Different types and sizes of rock have different densities, and moisture can also affect weight. Use the supplier's material-specific weight information when converting between cubic yards and tons.

Using Cubic Yards for Concrete

Ready-mix concrete is commonly ordered by the cubic yard, so accurately measuring slab dimensions matters.

Suppose a slab is 12 feet long, 12 feet wide, and 4 inches thick.

Convert 4 inches to feet:

4 ÷ 12 ≈ 0.333 feet

Calculate the cubic feet:

12 × 12 × 0.333 ≈ 48 cubic feet

Then convert to cubic yards:

48 ÷ 27 ≈ 1.78 cubic yards

For actual concrete ordering, contractors typically account for waste, uneven subgrade, spillage, and supplier minimums rather than ordering exactly the theoretical volume.

Common Cubic Yard Conversion Mistakes

Quick Conversion Cheat Sheet

Frequently Asked Questions

The Bottom Line

If you only remember one number, remember 27: there are 27 cubic feet in a cubic yard.

Multiply cubic yards by 27 to get cubic feet. Divide cubic feet by 27 to get cubic yards. When you're estimating mulch, soil, gravel, compost, or concrete, make sure your depth is converted to feet before calculating the volume.

Measurement note: This guide deals with volume. Material weight can vary substantially based on density, particle size, compaction, and moisture, so use supplier-specific information when converting cubic yards to pounds or tons.