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.
