how do you calculate cubic yards of concrete

by Brooke Von Published 3 years ago Updated 2 years ago

Just follow these steps:

Measure the area in feet.
Multiply length by width, and then by thickness.
Divide the resulting number by 27 to find cubic yards.

Just follow these steps:

Measure the area in feet.
Multiply length by width, and then by thickness.
Divide the resulting number by 27 to find cubic yards.

Jan 7, 2021

Full Answer

What is the formula to calculate yards of concrete?

how much concrete do i need for a 10' x 10' slab?

@ 4" thick you'll need 1.25 yards of concrete
@ 5" thick you'll need 1.6 yards of concrete
@ 6" thick you'll need 2 yards of concrete

How many cubic feet are in a yard of concrete?

You might be wondering just how much concrete is in a cubic yard? A cubic yard is equal to 27 cubic feet or 46,656 cubic inches, or 45 80lb bags. Concrete Cubic Yards Formulas Use the following formulas to calculate the concrete needed for various types of pours. Square and Rectangular Areas

How many cubic yards of concrete do you need?

You can use this measurement to figure out how many bags of concrete to use. If you divide 3.93 cubic feet by 27 (3.93/27) = .146 cubic yards. Dividing cubic feet by 27 (a cubic yard) will give you the concrete yardage. This would be good to know if you had a lot of sono-tubes or a large cylinder to fill. Go to concrete yardage calculator

How do you calculate a square yard of concrete?

Method 2 Method 2 of 2: Quick Method for Basic Slabs Download Article

Ensure your concrete pour is a rectangular prism. Contractors have devised a quick, easy system of determining how much concrete yardage is needed for a given pour.
Find the square footage of the area you're pouring. Square footage (written "sq. ...
Divide your square footage by a numerical coefficient. ...
Determine odd coefficients manually. ...

How many yards of concrete do I need for a 24x24 x4 slab?

7.11 yardsFor example, for a concrete slab that is 24' X 24' X 4”, simply enter 4 in the Thickness/Depth field, 24 in the Width field, and 24 in the Length field. Click “Calculate”. Your answer should be 7.11 yards. Note: The Concrete Volume Calculator can also be used to determine yardage for aggregate products.

How many cubic yards are in a 10x10 slab?

1.3 cubic yardsThe amount you will need for a 10 x 10 slab is 1.3 cubic yards, we always add an extra 10% to allow for any slab depth variations or spills that may occur.

How do I measure how much concrete I need?

Multiply the width times the length times the height (W × L × H), or use our volume calculator to find the cubic feet. Convert the volume to cubic yards from cubic feet. To do so, divide the cubic footage by 27 to get the yards of concrete needed.

What is the formula for figuring out concrete?

Use the formula. Calculating the volume for concrete requires using three dimensions: length times width (which is area) times the height (thickness) or L x W x H. If you are using feet as your standard unit of measurement, this formula will give you the volume of concrete in cubic feet.

How many yards of concrete do I need for a 10x12 slab?

Regarding this, “how much concrete do I need for a 10×12 slab?”, at 4 inches thick, generally you will need approximately 1.46 cubic yards or 39.6 cubic feet (either 86 bags of 60lb or 67 bags of 80lb) of premixed concrete for a 10×12 slab, at 5 inches thick slab, 1.85 cubic yards or 50 cubic feet (either 109 bags of ...

How many yards of concrete do I need for a 12x12 slab?

Regarding this, “how much concrete do I need for a 12×12 slab?”, at 4 inches thick, generally you will need approximately 1.76 cubic yards or 47.52 cubic feet or 1.35 m3 (either 104 bags of 60lb or 80 bags of 80lb) of premixed concrete for a 12×12 slab, at 5 inches thick slab, 2.22 cubic yards or 59.90 cubic feet or ...

How do I figure cubic yards?

You can easily calculate cubic yardage by converting all three dimensions of your material into yards and multiplying them. For example, if you dig up a flower bed that is 9 feet long, 3 feet wide and 12 inches deep, you will have one cubic yard of dirt.

How many square feet is a yard of concrete 4 inches thick?

81 square feetOne Cubic Yard of Concrete: 4-inches thick – covers 81 square feet.

How many 80 lbs bags of concrete make a cubic yard?

45 bagOne 80lbs bag of Quikrete Concrete Mix will yield approximately . 60 cu ft. So it will take 45 bag to equal one cubic yard of concrete. If you have a project over a 1/2 a cubic yard you should consider our Mix On-site Concrete especially if you are hand mixing.

How thick should a concrete slab be?

4 inchesStandard concrete floor slab thickness in residential construction is 4 inches. Five to six inches is recommended if the concrete will receive occasional heavy loads, such as motor homes or garbage trucks.

How thick should a concrete driveway be?

four inches thickAs for thickness, non-reinforced pavement four inches thick is standard for passenger car driveways. For heavier vehicles, a thickness of five inches is recommended. To eliminate standing water, the driveway should be sloped towards the street a minimum of one percent, or 1/8 inch per foot, for proper drainage.

Calculator Use

Calculate volumes for concrete slabs, walls, footers, columns, steps, curbs and gutters. Enter dimensions in US units (inches or feet) or metric units (centimeters or meters) of your concrete structure to get the cubic yards value of the amount of concrete you will need to make this structure.

Curbs & Gutters

We calculate the volume in sections from the ground to the top of each section. The Curb and Gutter are each a section.

Should I order concrete by the yard from a ready mix company or just use bags?

Larger jobs such as driveways are easier to complete when ordering concrete by the yard, rather than trying to mix bag after bag by hand. For smaller jobs, like a walkway, modest patio or footings, you should calculate the number of concrete bags instead.

Calculating the amount of concrete needed for slabs (including odd shapes)

Rule of thumb: add 1 / 4 " to the thickness of your slab for your slab concrete budget. This assumes you have the job evenly graded to the right depth, and the grade is well compacted.

Calculating the amount of concrete needed for footings

Footings will rarely follow the drawing exactly. In rocky soil the footings may collapse when big rocks are excavated

Estimating concrete steps

Steps seem tricky to calculate but are not. If there are three steps leading up to a porch:

Calculating the amount of base fill

Granite Construction has an excellent base fill calculator on their site. Use this to figure how much material you need for the subgrade.

Requesting your ready mix supplier to visit your site

After you have chosen a Ready Mix Supplier, have a representative come to your site to give his/her opinion on the quantity required. Compare the figure with what you came up with. Discuss any variances with the supplier.

How to calculate how much concrete I need for a slab?

How do I calculate how much concrete I need for a slab? To calculate the amount of concrete you need for a slab, you should find the cubic yardage of the area you will be filling. Just follow these steps: Measure the area in feet. Multiply length by width, and then by thickness.

How much does concrete cost per yard?

How much is concrete a yard? The cost of concrete per cubic yard depends on which brand you purchase, but usually costs about $110 for bags .

How many square feet does an 80 lb bag of concrete cover?

One 80lb -bag covers an area of about 2 square feet, for a slab 4 inches thick. Two 60lb -bags of concrete cover an area of about 2 square feet for a slab that is 6 inches thick.

What factors affect the cost of concrete?

There are several things that can affect the cost of your concrete project, including: How complicated the project is: stairs will likely cost more than a slab, for example. Materials: polymer concrete is often more expensive. Labor prices: jobs that take longer and need more workers will have a higher price.

How long does it take for concrete to harden?

Here are a few common varieties of concrete: Quick-set: Hardens in 20 to 40 minutes. Best for small projects. Regular-set: 24 to 48 hour set time. Used more for large projects. High-strength: Usually sets in 10 to 12 hours.

Does adding rebar to concrete cost more?

Extra strength: adding rebar or mesh to the concrete will up the cost. Additional tasks: if pros need to remove debris, get rid of your existing patio or dig before starting, it will be more expensive.

Can you order concrete by cubic yard?

If you have a larger job, like a building a driveway or pool deck, it’s probably best to order concrete by the cubic yard or hire a concrete delivery service. For smaller jobs, like setting posts for fences or small curbs, mixing bags of concrete should be sufficient.

How to calculate how many yards of concrete do you need for different applications?

Calculating yards of concrete is in fact very simple. It is basically the process of calculating the volume that needs to be filled with concrete. These calculations often use simple mathematical equations, depending on the shape of the object.

Concrete Yards Calculator

You can also use tools that can help you calculate how many yards of concrete do you need for your project, just like our “ Imperial Concrete Calculator (Cubic Yards & Bags) “.

How many square feet in a yard of concrete?

Generally, a yard of concrete means a cubic yard, which resembles volume. Whereas, a square foot is an area unit. Hence, in order to calculate how many square feet in a yard of concrete, we should also consider thickness.

How many yards of concrete do I need for a 24x24x4 slab?

For a 24x24x4 slab, you will need exactly 7.11 cubic yards of concrete. Considering the slab of 24 feet x 24 feet x 4 inches, the required concrete yards or volume = area x thickness, as explained in this article.

How many yards of concrete do I need for a 30x30x4 slab?

For a slab of 30x30x4, you will need 11.11 cubic yards of concrete. Actually, the calculation is simple, in order to calculate the volume of the 30 feet x 30 feet x 4 inches slab, you need to convert the units from inches and feet to yards first.

How many yards of concrete do I need for 800 square feet slab 6 inches deep?

For 800 square feet slab, 6 inches thick, you will need exactly 14.81 yards of concrete. The formula is as follows, 800/9 x 6/36 = 14.81 cubic yards. We divide by 9 in order to convert square feet into square yards, and by 36 to convert inches to yards.

How many cubic feet in a yard of concrete?

One yard of concrete equals 27 cubic feet. In fact, each linear yard makes 3 linear feet. Hence, to convert cubic yards to a cubic feet, multiply by 3 three times (3x3x3 = 27).

Concrete calculator formula for floors and slabs

This is how you use a formula to calculate concrete for a square concrete slab or a rectangular shaped floor or slab.

concrete calculator formula for a round slab

The formula to calculate concrete yardage for a round slab is very different than the formula for a square slab. Square footage is calculated using Pi and the diameter of the circle to help determine cubic yardage.

calculator formula for a concrete wall

Calculating concrete yardage for a wall uses the same formula as a slab.

Formula to calculate concrete for a footer

Calculating concrete yardage for a footing is done much like a slab, you just usually have smaller units of measurement for width.

Concrete calculator formula for a square column

Calculating concrete for a square column first starts with calculating the cubic feet of the column.

Formula to calculate concrete for a round column

The formula to calculate concrete yardage for a round column is just like the round slab formula above. The difference is a column's height is usually much greater than a slab.

How to calculate concrete for steps

This is how you calculate concrete yardage for a set of concrete steps.

Circle Border Area

Obviously, the Circle Border and Annulus are the same, just measured differently.

Annulus Area