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A delivery ticket says one cubic yard. The pile in your driveway looks big, but how far will it actually stretch once you rake it out? Ask around and you will mostly hear "it depends how thick you spread it," which is true but not much help. This guide gives you that answer for every common depth, explains what changes from one material to the next, and shows how to plan an order from the area you need to cover.
The Short Answer
One cubic yard covers 324 square feet at 1 inch deep. For any other depth, divide 324 by the depth in inches. That gives you these everyday figures:
- 162 square feet at 2 inches, a typical depth for topping up old mulch or laying a gravel path
- 108 square feet at 3 inches, the depth many people use for a fresh layer of mulch
- 81 square feet at 4 inches, common for a standard concrete slab or a gravel shed base
- 54 square feet at 6 inches, a typical topsoil depth for a new lawn
The rest of this article explains where 324 comes from, gives a full coverage table, and covers the things that make coverage on the ground differ from the figure on paper.
Why There Is No Single "Square Feet in a Cubic Yard" Figure
People often search for how many square feet are in a cubic yard, as if there were a fixed conversion like 12 inches to a foot. There isn't one. A square foot measures a flat surface, while a cubic yard measures a volume. Asking how many square feet are in a cubic yard is a bit like asking how many slices are in a loaf of bread: it depends entirely on how thick you cut them.
Imagine a cubic yard as a box 3 ft long, 3 ft wide and 3 ft tall, holding 27 cubic feet of material. (If that number is new to you, our guide to how many cubic feet are in a cubic yard explains it.) Now picture tipping that box over and spreading its contents flat. Spread it a foot thick and it covers 27 square feet. Spread it an inch thick and the same material covers 324 square feet. The volume never changes; only the shape does.
The Cubic Yard Coverage Formula
Coverage is simply volume divided by depth. Because a cubic yard holds 27 cubic feet, and there are 12 inches in a foot, the math comes down to a single number:
Square feet covered = 27 ÷ depth (ft)
Square feet covered = 324 ÷ depth (in)
For several yards: square feet = cubic yards × 324 ÷ depth (in)
The 324 is just 27 × 12, so working in inches saves you converting the depth to feet first. The same number appears when you go the other way, from an area to cubic yards, which our cubic yard calculation guide walks through step by step.
Cubic Yard Coverage by Depth
This table runs from a thin dusting to a full foot. The metric column shows the same depth in centimeters, and the last column compares each area to something familiar, which can help when you are standing in the yard trying to picture it.
| Depth | Approx. cm | Square feet covered | About the size of |
|---|---|---|---|
| ¼ in | 0.6 | 1,296 | A large lawn |
| ½ in | 1.3 | 648 | A double garage |
| 1 in | 2.5 | 324 | 18 × 18 ft patio |
| 1½ in | 3.8 | 216 | 12 × 18 ft deck |
| 2 in | 5.1 | 162 | 9 × 18 ft strip |
| 3 in | 7.6 | 108 | 9 × 12 ft room |
| 4 in | 10.2 | 81 | 9 × 9 ft square |
| 5 in | 12.7 | 65 | 6.5 × 10 ft bed |
| 6 in | 15.2 | 54 | 6 × 9 ft rug |
| 8 in | 20.3 | 40.5 | 4.5 × 9 ft bed |
| 10 in | 25.4 | 32.4 | 6 × 5.4 ft sandbox |
| 12 in | 30.5 | 27 | 3 × 9 ft trench |
Notice how quickly coverage falls as the layer gets thicker. Going from 2 inches to 4 inches does not just trim the coverage a little; it cuts it in half. That is why the depth you choose has a far bigger effect on your order than small errors in measuring the area.
Coverage by Material: What Changes in Practice
On paper, a cubic yard of mulch and a cubic yard of gravel cover exactly the same area at the same depth. Once the material is on the ground, a few things make the finished coverage drift from the table above. This is what to expect from each one.
Mulch coverage per cubic yard
Fresh bark and wood mulch is fluffy. It settles after the first good rain and slowly breaks down over the season. A yard spread 3 inches deep covers 108 square feet on day one, but many gardeners lay it slightly thicker to finish at 3 inches, which in practice means planning on something closer to 100 square feet per yard. The Mulch Calculator has an optional waste field for this, and our guide to how much mulch you need covers depths for different beds.
Gravel coverage per cubic yard
Gravel splits into two groups. Rounded stone such as pea gravel stays loose, so it covers close to the table figure: about 162 square feet per yard at 2 inches on a path. Crushed stone used for a driveway or patio base is different. It gets compacted, and it can lose a noticeable share of its loose volume in the process. If a base layer compacts by about 15 percent, a loose yard finishes as roughly 0.85 of a yard, so at 4 inches compacted it covers about 69 square feet instead of 81. Our gravel guide shows how to order for compaction, and the Gravel Calculator does the math.
Topsoil coverage per cubic yard
Freshly delivered topsoil is full of air. After it is rolled, watered and walked on, deep layers sink a little. At 6 inches for a new lawn, one yard covers 54 square feet when spread, but the finished surface may sit lower after a few weeks, especially in deep fills. Thin layers raked over a lawn barely change. The Topsoil Calculator and our topsoil guide cover the common depths for lawns, beds and raised beds.
Sand coverage per cubic yard
Sand covers a lot of ground when it is used thinly. As a 1-inch bedding layer under pavers, one yard covers about 324 square feet, which is enough for a fairly large patio. Fill a sandbox 10 inches deep and the same yard covers only about 32 square feet. Damp sand also takes up more room than dry sand, so a fresh delivery can look bigger than it really is. Our sand guide explains which type suits each job, and the Sand Calculator works out the volume.
Concrete coverage per cubic yard
Concrete does not settle or compact like loose materials, but the ground under a slab is rarely perfectly flat, and some is always lost to spillage and form edges. At 4 inches thick, one yard covers 81 square feet in theory. With a typical allowance of 5 to 10 percent, plan on roughly 74 to 77 square feet per yard. Our slab estimating guide goes deeper, and the Concrete Calculator handles slabs, footings and columns.
Coverage for More Than One Yard
Coverage scales in a straight line. Multiply the number of cubic yards by 324, then divide by the depth in inches. Five yards of mulch at 3 inches covers 5 × 324 ÷ 3 = 540 square feet. Ten yards of gravel at 2 inches covers 1,620 square feet.
This is handy when a supplier has a minimum load, or you have leftover material from another job and want to know where it can go. If you only know the weight, convert it to cubic yards first. A ton of gravel at about 1.4 tons per cubic yard is roughly 0.71 of a yard, so it covers about 116 square feet at 2 inches. Our cubic yards to tons guide explains how to find the right density for your material.
Going the Other Way: How Many Yards for Your Area?
Most of the time you start with an area and need to know how much to order. Once you know what one yard covers at your depth, divide your area by that figure.
Cubic yards needed = area (sq ft) ÷ coverage per yard at your depth
Say your beds total 600 square feet and you want 3 inches of mulch. One yard covers 108 square feet at that depth, so you need 600 ÷ 108 = 5.56 cubic yards. Bulk material is usually sold in half or whole yards, so you would order 6. If your area is listed on a plan or survey, our guide to converting square feet to cubic yards has a quick divisor table, and the Square Feet Calculator finds the area of circles, triangles and other shapes.
If you are buying bags rather than bulk, the same thinking applies. Our guide to how many bags are in a cubic yard turns your cubic yards into a bag count for any label size.
When the Depth Is Not Even
Coverage tables assume a perfectly level layer, but real ground has dips and humps. Filling a low corner of a lawn or building up one side of a sloping bed uses material unevenly, so a yard will cover less area where the layer is deep and more where it is thin.
The practical fix is to work with the average depth. Take several depth readings across the area, add them up, divide by the number of readings and use that figure in the formula. A bed that needs 2 inches at one end and 4 at the other averages 3 inches, so one yard covers about 108 square feet of it.
Metric Coverage at a Glance
One cubic yard is about 0.765 cubic meters. To find metric coverage, divide 0.765 by the depth in meters. At 5 cm deep, a cubic yard covers roughly 15.3 square meters; at 7.5 cm, about 10.2 square meters; at 10 cm, about 7.6 square meters. If your supplier sells by the cubic meter, remember that one cubic meter is about 1.31 cubic yards, so it covers about 31 percent more ground at the same depth.
Common Coverage Mistakes
- Mixing up depth units. The 324 rule only works with inches. If you measured the depth in feet, divide 27 by it instead.
- Forgetting compaction. A base layer that gets compacted needs more loose material than the finished volume suggests.
- Measuring the whole yard instead of the beds. Subtract paths, patios, trees and anything else that will not be covered.
- Spreading too thin to stretch a load. Mulch or gravel laid well below the planned depth wears through quickly and may need topping up sooner.
- Rounding each area separately. Add up all the areas first, then convert once. Rounding every bed up adds material you do not need.
Frequently Asked Questions
How many square feet does a cubic yard of mulch cover?
About 108 square feet at 3 inches deep and 162 square feet at 2 inches. Because fresh mulch settles, many people plan on slightly less than these figures.
How much area does a yard of gravel cover at 2 inches?
About 162 square feet for loose gravel such as pea gravel. Crushed stone that will be compacted covers less once it has been tamped down.
How many square feet does a yard of topsoil cover at 4 inches?
About 81 square feet. At 6 inches, which is common for a new lawn, it covers about 54 square feet.
How many cubic yards do I need for 1,000 square feet?
Multiply 1,000 by the depth in inches and divide by 324. At 2 inches you need about 6.17 cubic yards; at 3 inches, about 9.26; at 4 inches, about 12.35.
Is there a cubic yard coverage calculator?
Yes. Enter your area and depth in the CY Calculator to get cubic yards, or use the material calculators for mulch, gravel, sand and topsoil, which also show coverage charts for one yard at common depths.
Final Thoughts
How much area a cubic yard covers comes down to one number: 324 divided by the depth in inches. The rest is about the material. Mulch and topsoil settle a little, base gravel compacts, sand bulks when damp and concrete needs a small allowance for waste. Keep those in mind, measure your area carefully and you will know before the truck arrives how far each yard will go. To skip the arithmetic, the CY Calculator works out cubic yards for any shape and depth in seconds.
Put it into practice
Use the calculator to get your exact numbers in seconds.