1 Yard of Concrete Covers How Many Square Feet?

If you’re planning a patio, driveway, sidewalk, or slab, you may wonder: How many square feet does 1 yard of concrete cover?

The answer depends on the thickness of the concrete. Since concrete is measured in cubic yards, the area it covers changes based on how deep the pour will be.

For a standard slab that is 4 inches thick, 1 cubic yard of concrete covers approximately 81 square feet.

In this guide, you’ll learn how to calculate concrete coverage, see coverage charts for different slab thicknesses, and estimate how much concrete your project needs.

Quick Answer: How Many Square Feet Does 1 Yard of Concrete Cover?

One cubic yard of concrete equals:

27 cubic feet
46,656 cubic inches

The coverage depends on slab thickness:

Concrete Thickness	Coverage Area
2 inches	162 sq ft
3 inches	108 sq ft
4 inches	81 sq ft
5 inches	65 sq ft
6 inches	54 sq ft

For most residential projects:

1 cubic yard of concrete covers about 81 square feet at a thickness of 4 inches.

What Is a Cubic Yard of Concrete?

Concrete is sold by the cubic yard.

One cubic yard equals:

3 feet long
3 feet wide
3 feet high

Calculation:

Therefore:

1 cubic yard = 27 cubic feet.

How to Calculate Concrete Coverage

To estimate the area covered by concrete, use the following formula:

Coverage Area = Cubic Feet ÷ Thickness (in feet)

For a 4-inch slab:

Convert 4 inches to feet:

4 ÷ 12 = 0.333 feet

Now calculate:

27 ÷ 0.333 ≈ 81 square feet

So:

One yard of concrete covers about 81 square feet at 4 inches thick.

Concrete Coverage Chart

Here is a quick reference chart showing how much area one cubic yard covers at various depths:

Thickness	Coverage
2 inches	162 sq ft
3 inches	108 sq ft
4 inches	81 sq ft
5 inches	65 sq ft
6 inches	54 sq ft
8 inches	40 sq ft
12 inches	27 sq ft

Thicker slabs cover less area because more concrete is used.

Common Projects and Recommended Thickness

Different projects require different slab depths.

Project	Recommended Thickness
Sidewalk	4 inches
Patio	4 inches
Shed foundation	4–5 inches
Driveway	5–6 inches
Garage floor	6 inches

Always check local building requirements before pouring concrete.

How Much Concrete Do Common Areas Need?

10 × 10 Slab (100 sq ft)

At 4 inches thick:

100 ÷ 81 ≈ 1.24 cubic yards

12 × 12 Patio (144 sq ft)

At 4 inches thick:

144 ÷ 81 ≈ 1.78 cubic yards

20 × 20 Driveway (400 sq ft)

At 4 inches thick:

400 ÷ 81 ≈ 4.94 cubic yards

Why Thickness Matters

Concrete thickness affects:

Strength
Durability
Weight capacity
Cost

For example:

Thin slabs work well for patios and walkways.
Thick slabs are better for driveways and garages.

Pouring concrete that is too thin can lead to cracking and damage.

How Many Bags of Concrete Equal 1 Cubic Yard?

Approximate bag requirements:

Bag Size	Bags Needed
40-pound bags	90 bags
50-pound bags	72 bags
60-pound bags	60 bags
80-pound bags	45 bags

Large projects are usually easier and cheaper with ready-mix concrete delivery.

Tips for Ordering Concrete

Before ordering concrete:

Measure the length and width carefully.
Determine the slab thickness.
Add 5–10% extra for waste.
Consider reinforcement needs.
Check local building codes.

Ordering slightly more concrete helps avoid shortages during the pour.

FAQs

How many square feet does 1 yard of concrete cover at 4 inches thick?

One cubic yard covers approximately 81 square feet at a thickness of 4 inches.

How much area does 1 yard of concrete cover at 6 inches thick?

At 6 inches thick, one cubic yard covers about 54 square feet.

What is a cubic yard of concrete?

A cubic yard equals 27 cubic feet.

How many bags of concrete make 1 cubic yard?

It takes about:

45 bags of 80-pound concrete
60 bags of 60-pound concrete

How thick should a concrete driveway be?

Most driveways require 5–6 inches of concrete.

How do I calculate concrete coverage?

Divide 27 cubic feet by the slab thickness in feet.

Should I order extra concrete?

Yes. Most professionals recommend ordering 5–10% extra.

Quick Facts

1 cubic yard equals 27 cubic feet.
At 4 inches thick, 1 yard covers 81 square feet.
At 6 inches thick, it covers 54 square feet.
Thicker slabs require more concrete.
Most patios and sidewalks use 4-inch slabs.

Final Thoughts

The number of square feet that 1 yard of concrete covers depends on the thickness of the slab. For the most common residential projects, a cubic yard covers approximately 81 square feet at 4 inches thick.

By understanding concrete coverage and using the proper formulas, you can estimate materials more accurately and avoid costly mistakes during your project.