If you’re planning a concrete project, understanding how concrete is measured is essential. One of the most common questions is how many cubic feet of concrete are in a yard.
The answer is straightforward:
1 cubic yard of concrete = 27 cubic feet
A cubic yard is a volume measurement. Since one yard equals 3 feet, a cubic yard is a cube measuring 3 feet long × 3 feet wide × 3 feet high.
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Therefore:
3 × 3 × 3 = 27 cubic feet
So, when a concrete supplier says you need 1 cubic yard of concrete, you’re ordering enough concrete to fill a volume of 27 cubic feet.
This conversion is useful when estimating concrete for slabs, patios, sidewalks, driveways, foundations, footings, and other construction projects.
Quick Answer: How Many Cubic Feet Are in a Yard of Concrete?
There are 27 cubic feet in 1 cubic yard of concrete.
The conversion is:
- 1 cubic yard = 27 cubic feet
- 2 cubic yards = 54 cubic feet
- 3 cubic yards = 81 cubic feet
- 4 cubic yards = 108 cubic feet
- 5 cubic yards = 135 cubic feet
- 10 cubic yards = 270 cubic feet
The term “yard” in this context means cubic yard, not a linear yard.
Why Is a Cubic Yard 27 Cubic Feet?
A cubic yard has three dimensions:
- Length = 3 feet
- Width = 3 feet
- Height = 3 feet
Multiply the dimensions:
3 × 3 × 3 = 27 cubic feet
Therefore:
1 cubic yard = 27 cubic feet
This works for any material measured by volume, including:
- Concrete
- Soil
- Gravel
- Sand
- Mulch
- Stone
For example, one cubic yard of gravel also occupies 27 cubic feet of volume, although its weight will be different from concrete.
What Is a Cubic Yard of Concrete?
A cubic yard is a unit of volume, not weight.
When a concrete supplier delivers one cubic yard, the concrete occupies approximately:
27 cubic feet of volume
The weight of that concrete can vary depending on its composition, but normal-weight concrete is often estimated at roughly 3,500–4,000 pounds per cubic yard.
The exact weight depends on the mix design and materials used.
Cubic Feet vs. Cubic Yards
It’s important not to confuse these two measurements.
| Measurement | Equivalent |
|---|---|
| 1 cubic foot | 0.037 cubic yards |
| 10 cubic feet | 0.37 cubic yards |
| 20 cubic feet | 0.74 cubic yards |
| 27 cubic feet | 1 cubic yard |
| 54 cubic feet | 2 cubic yards |
| 81 cubic feet | 3 cubic yards |
| 108 cubic feet | 4 cubic yards |
| 135 cubic feet | 5 cubic yards |
To convert cubic feet to cubic yards, divide by 27.
To convert cubic yards to cubic feet, multiply by 27.
How Do You Calculate Cubic Feet of Concrete?
For a rectangular slab, use:
Volume = Length × Width × Thickness
All measurements should be in feet.
For example, suppose you’re pouring a concrete slab that is:
- 20 feet long
- 10 feet wide
- 4 inches thick
First convert 4 inches to feet:
4 ÷ 12 = 0.333 feet
Then calculate the volume:
20 × 10 × 0.333 ≈ 66.6 cubic feet
So the slab requires approximately 66.6 cubic feet of concrete before accounting for waste.
To convert that to cubic yards:
66.6 ÷ 27 ≈ 2.47 cubic yards
You would generally order somewhat more than the calculated amount to account for variations and waste.
How Many Cubic Feet Are in 2 Yards of Concrete?
If one cubic yard equals 27 cubic feet:
2 × 27 = 54 cubic feet
Therefore:
2 cubic yards = 54 cubic feet
How Many Cubic Feet Are in 3 Yards of Concrete?
Multiply 3 by 27:
3 × 27 = 81
Therefore:
3 cubic yards = 81 cubic feet
How Many Cubic Feet Are in 4 Yards of Concrete?
4 × 27 = 108
Therefore:
4 cubic yards = 108 cubic feet
How Many Cubic Feet Are in 5 Yards of Concrete?
5 × 27 = 135
Therefore:
5 cubic yards = 135 cubic feet
How Many Cubic Feet Are in 10 Yards of Concrete?
10 × 27 = 270
Therefore:
10 cubic yards = 270 cubic feet
Ten cubic yards is a substantial quantity and may be appropriate for larger construction projects such as large foundations, driveways, or slabs.
How Many Square Feet Does a Yard of Concrete Cover?
A cubic yard measures volume, so there isn’t one fixed number of square feet that one yard of concrete covers.
Coverage depends on the concrete’s thickness.
For example, one cubic yard contains 27 cubic feet.
If the concrete is 4 inches thick:
4 inches = 1/3 foot
Then:
27 ÷ 1/3 = 81 square feet
Therefore, one cubic yard can cover approximately:
81 square feet at 4 inches thick
At other thicknesses:
| Concrete Thickness | Approximate Coverage From 1 Cubic Yard |
|---|---|
| 2 inches | 162 sq ft |
| 3 inches | 108 sq ft |
| 4 inches | 81 sq ft |
| 5 inches | 64.8 sq ft |
| 6 inches | 54 sq ft |
| 8 inches | 40.5 sq ft |
| 12 inches | 27 sq ft |
These figures assume a perfectly uniform layer and don’t include waste or variations in the subgrade.
How Many Square Feet Does 1 Yard of Concrete Cover at 4 Inches?
A common question is how much area one cubic yard covers for a standard 4-inch slab.
Four inches equals:
4 ÷ 12 = 1/3 foot
One cubic yard contains 27 cubic feet.
Therefore:
27 ÷ 1/3 = 81 square feet
1 cubic yard covers approximately 81 square feet at 4 inches thick.
This is a useful rule of thumb for estimating concrete patios, sidewalks, and similar slabs.
How Many Square Feet Does 1 Yard Cover at 6 Inches?
Six inches equals:
6 ÷ 12 = 0.5 feet
Then:
27 ÷ 0.5 = 54 square feet
Therefore:
1 cubic yard covers approximately 54 square feet at 6 inches thick.
How Many Square Feet Does 1 Yard Cover at 8 Inches?
Eight inches equals:
8 ÷ 12 = 0.667 feet
Then:
27 ÷ 0.667 ≈ 40.5 square feet
So one cubic yard covers approximately:
40.5 square feet at 8 inches thick
How Much Concrete Do You Need for a 10×10 Slab?
Let’s calculate a 10×10-foot slab at 4 inches thick.
Step 1: Calculate the area
10 × 10 = 100 square feet
Step 2: Convert thickness
4 inches ÷ 12 = 0.333 feet
Step 3: Calculate cubic feet
100 × 0.333 ≈ 33.3 cubic feet
Step 4: Convert to cubic yards
33.3 ÷ 27 ≈ 1.23 cubic yards
So a 10×10 slab at 4 inches thick requires approximately:
1.23 cubic yards of concrete
You would typically account for some additional material when placing an actual order.
How Much Concrete Do You Need for a 20×20 Slab?
For a 20×20-foot slab at 4 inches thick:
20 × 20 = 400 square feet
Convert thickness:
4 ÷ 12 = 0.333 feet
Calculate volume:
400 × 0.333 ≈ 133.2 cubic feet
Convert to cubic yards:
133.2 ÷ 27 ≈ 4.93 cubic yards
Therefore, the basic calculation is approximately:
4.93 cubic yards
A practical order may be somewhat higher depending on site conditions and the supplier’s recommendation.
How Much Concrete Do You Need for a 10×20 Slab?
A 10×20 slab has:
10 × 20 = 200 square feet
At 4 inches thick:
200 × 0.333 ≈ 66.6 cubic feet
Convert to cubic yards:
66.6 ÷ 27 ≈ 2.47 cubic yards
So the theoretical requirement is approximately:
2.47 cubic yards
Concrete Yardage Calculation Formula
For a rectangular slab, the basic formula is:
Cubic yards = Length × Width × Thickness ÷ 27
The important point is that thickness must be measured in feet.
For example, if the slab is 4 inches thick:
4 ÷ 12 = 0.333 feet
So:
Length × Width × 0.333 ÷ 27
will give you the approximate cubic yards required.
Concrete Calculation Table
Here’s a quick reference for a 4-inch-thick slab:
| Area | Approximate Concrete |
|---|---|
| 100 sq ft | 1.23 yd³ |
| 200 sq ft | 2.47 yd³ |
| 300 sq ft | 3.70 yd³ |
| 400 sq ft | 4.94 yd³ |
| 500 sq ft | 6.17 yd³ |
| 750 sq ft | 9.26 yd³ |
| 1,000 sq ft | 12.35 yd³ |
These values represent calculated volume before adding an allowance for waste or variations.
Does One Yard of Concrete Always Weigh the Same?
No.
A cubic yard always contains 27 cubic feet, but its weight can vary.
Concrete weight depends on:
- Aggregate type
- Mix design
- Water content
- Density
- Lightweight or normal-weight aggregate
- Moisture
- Supplier specifications
Normal-weight concrete is commonly around 145–150 pounds per cubic foot, which translates to roughly 3,900–4,050 pounds per cubic yard.
Actual delivered concrete should be evaluated using the supplier’s mix information.
How Many Cubic Feet Are in a Truckload of Concrete?
Concrete trucks can carry different quantities depending on the truck and supplier.
A typical ready-mix truck may carry several cubic yards of concrete, often around 8–10 cubic yards, although capacity varies.
For example:
8 cubic yards × 27 = 216 cubic feet
And:
10 cubic yards × 27 = 270 cubic feet
Always confirm the truck’s actual capacity with the concrete supplier.
Should You Order Extra Concrete?
Yes, it’s generally wise to account for some margin when ordering concrete.
The calculated volume assumes:
- Exact dimensions
- Perfectly level ground
- No material loss
- No over-excavation
- Uniform thickness
Real jobs rarely meet all these conditions.
Extra concrete may be needed because of:
- Uneven subgrade
- Excavation variations
- Spillage
- Form inaccuracies
- Slightly thicker areas
- Pump or delivery losses
Your concrete supplier or contractor can recommend an appropriate allowance.
Common Mistakes When Calculating Concrete
1. Forgetting to Convert Inches to Feet
If your slab is 4 inches thick, don’t enter “4” directly into a formula that expects feet.
Convert it first:
4 ÷ 12 = 0.333 feet
2. Confusing Cubic Feet With Square Feet
Cubic feet measure volume.
Concrete quantity requires a volume calculation.
3. Forgetting Slab Thickness
A 4-inch slab and a 6-inch slab covering the same area require different amounts of concrete.
4. Not Accounting for Irregular Shapes
For an L-shaped or irregular slab, divide it into smaller rectangles and add the volumes together.
5. Ordering the Exact Calculated Amount
A small amount of extra material may be appropriate because actual site conditions can differ from measurements.
How to Calculate Concrete for an Irregular Area
If your project isn’t rectangular, divide it into simple sections.
For example:
- Section A = 200 sq ft
- Section B = 100 sq ft
- Section C = 50 sq ft
Total area:
200 + 100 + 50 = 350 square feet
Then multiply the total area by the required thickness in feet.
For a 4-inch slab:
350 × 0.333 ≈ 116.6 cubic feet
Convert to cubic yards:
116.6 ÷ 27 ≈ 4.32 cubic yards
This approach works for many patios, walkways, and driveways with irregular shapes.
Cubic Feet to Cubic Yards Conversion Chart
| Cubic Feet | Cubic Yards |
|---|---|
| 1 | 0.037 |
| 5 | 0.185 |
| 10 | 0.370 |
| 15 | 0.556 |
| 20 | 0.741 |
| 25 | 0.926 |
| 27 | 1 |
| 50 | 1.852 |
| 75 | 2.778 |
| 100 | 3.704 |
| 150 | 5.556 |
| 200 | 7.407 |
| 250 | 9.259 |
| 270 | 10 |
To convert any cubic-foot measurement to cubic yards:
Cubic feet ÷ 27 = cubic yards
Cubic Yards to Cubic Feet Conversion Chart
| Cubic Yards | Cubic Feet |
|---|---|
| 0.5 | 13.5 |
| 1 | 27 |
| 1.5 | 40.5 |
| 2 | 54 |
| 2.5 | 67.5 |
| 3 | 81 |
| 4 | 108 |
| 5 | 135 |
| 6 | 162 |
| 8 | 216 |
| 10 | 270 |
To convert cubic yards to cubic feet:
Cubic yards × 27 = cubic feet
FAQs
1. How many cubic feet are in a yard of concrete?
There are 27 cubic feet in one cubic yard of concrete.
The calculation is:
3 ft × 3 ft × 3 ft = 27 cubic feet
2. How many cubic feet are in 2 yards of concrete?
Two cubic yards equal 54 cubic feet.
2 × 27 = 54
3. How many cubic feet are in 5 yards of concrete?
Five cubic yards equal 135 cubic feet.
5 × 27 = 135
4. How many square feet does one yard of concrete cover?
It depends on thickness. At 4 inches thick, one cubic yard covers approximately 81 square feet. At 6 inches, it covers about 54 square feet.
5. How do I calculate how much concrete I need?
Multiply the length by width by thickness to find cubic feet, then divide by 27 to convert the result to cubic yards.
6. How much does a cubic yard of concrete weigh?
Normal-weight concrete commonly weighs around 3,500–4,000+ pounds per cubic yard, depending on its mix and density. Check with your concrete supplier for the exact weight.
7. Should I order extra concrete?
Usually, some allowance is prudent because actual site dimensions and thickness can vary. The appropriate amount depends on the project and should be confirmed with your contractor or supplier.
Conclusion
So, how many cubic feet of concrete are in a yard?
The answer is:
1 cubic yard = 27 cubic feet
A cubic yard is simply a volume measuring 3 feet × 3 feet × 3 feet, which equals 27 cubic feet.
For concrete projects, this conversion helps you calculate the amount needed for slabs, patios, driveways, sidewalks, footings, and foundations. To estimate concrete, multiply the project’s length by width and thickness, making sure the thickness is converted from inches to feet. Then divide the resulting cubic feet by 27 to determine the number of cubic yards.
For example, one cubic yard covers about 81 square feet when poured 4 inches thick, while the same yard covers about 54 square feet at 6 inches thick.
Because actual construction sites can have uneven subgrades, variations in dimensions, and material loss, use the calculated quantity as an estimate and confirm the final order with your concrete supplier or qualified contractor.
