Concrete Calculator and Price Estimator

Concrete Calculator

Calculate the concrete yards or number of concrete bags needed to pour a slab, patio, footing, or column, including circular slabs and patios.
Optionally enter the price per cubic yard
*Average is $80 per yd3 (source), although your price will vary based on the type of concrete, vendor, and location.

Concrete Material Estimate

Cubic
Yards:

Pre-mix
40# Bags:

Pre-mix
60# Bags:

Pre-mix
80# Bags:


Estimated Cost:

Optionally enter the price per cubic yard
*Average is $80 per yd3 (source), although your price will vary based on the type of concrete, vendor, and location.

Concrete Material Estimate

Cubic
Yards:

Pre-mix
40# Bags:

Pre-mix
60# Bags:

Pre-mix
80# Bags:


Estimated Cost:

Optionally enter the price per cubic yard
*Average is $80 per yd3 (source), although your price will vary based on the type of concrete, vendor, and location.

Concrete Material Estimate

Cubic
Yards:

Pre-mix
40# Bags:

Pre-mix
60# Bags:

Pre-mix
80# Bags:


Estimated Cost:

Optionally enter the price per cubic yard
*Average is $80 per yd3 (source), although your price will vary based on the type of concrete, vendor, and location.

Concrete Material Estimate

Cubic
Yards:

Pre-mix
40# Bags:

Pre-mix
60# Bags:

Pre-mix
80# Bags:


Estimated Cost:



Using the Concrete Calculator

How to estimate concrete material or bags of concrete

The concrete calculator will determine the cubic yardage for a slab, patio, footing, or post fill project. In addition to finding the yards, the calculator estimates the number of pre-mixed bags of concrete needed for the project. Estimate the price of a rectangle slab, circular slab, footing, or column.

Calculate the yards of concrete needed using imperial or metric measurements, including inches, feet, yards, centimeters, or meters. Find out the number of 40 pound, 60 pound, or 80 pound bags of concrete are needed for the same project. For example, a 10′ x 10′ slab that is 4″ thick will need an estimated 1.23 yards3 or 74 60lb bags of concrete and will cost roughly $100. Note that the calculator is only an estimate, and while it can help find the amount of cement needed for a project, it is recommended to order additional material to account for settling and spillage.

Find the amount of concrete needed or bags of concrete for a slab

Estimate How Much Concrete You Need

Concrete is sold by the cubic yard, or in pre-mixed bags. A cubic yard is just a standard volume, measured in yards. Find cubic yardage by multiplying width, length, and height of the project area. If you aren’t measuring in yards, convert all measurements to yards first, then multiply.

  • Measure the length, width, and height of the slab, footing, or column. If the area is complex or if multiple pours are needed, break the project into smaller pieces and calculate the concrete yardage of each individually. For instance, if you are measuring a slab that is not a rectangle or circle, break it into different sections and measure the yardage of each section first, then add the cubic yards together.

    Calculate the amount of concrete needed for a complex area
  • Convert dimensions to feet if they aren’t in feet. Convert inches to feet, convert yards to feet, or convert meters to feet
  • Multiply the width times the length times the height (W x L x H). It may be helpful to learn how to calculate concrete cubic yardage.
  • It is necessary to convert the cubic footage to cubic yardage. To do so, divide the cubic footage by 27 to get the cubic yardage.
  • Suppliers will likely not sell fractions of a yard so you may need to round up to the nearest yard and order that amount. It is worthwhile to ask your supplier if they will sell a partial yard of material, but the most do not.
  • If your project is small you can purchase bags of concrete from your local home center.

    • It takes 90 40lb bags of concrete to fill 1 cubic yard of volume.
    • It takes 60 60lb bags of concrete to fill 1 cubic yard of volume.
    • It takes 45 80lb bags of concrete to fill 1 cubic yard of volume.

Calculate the cubic yardage of a square volume

Square

cubic yardage (yds3) = width x length x height


Calculate the cubic volume of a rectangular volume

Rectangle

cubic yardage (yds3) = width x length x height


Calculate the cubic yards of a circle or cylinder volume using the formula πr² x height

Circle/Cylinder

cubic yardage (yds3) = ( π x (diameter / 2)2 ) x height
π = 3.14159265359


Estimating the Cost to Install Concrete

The average cost to install a concrete slab is $6 – $16 per square foot. In addition to the cost of the concrete itself, there are also labor costs for preparing the area, the pour, and the finish. A standard brush finish will likely be on the low end of the price range, while a decorative finish with coloring will be on the high end of the range. Consider getting a professional concrete installation estimate from contractors in your area for a more accurate cost estimate.

Preparing to Pour Concrete

Much of the work to pour concrete is done before the truck even arrives at the project. The site must be measured and laid out. Forms must be installed to create the edges of a slab or contain a footing. Rebar should be installed to reinforce the concrete and to prevent cracking in the future. Use our rebar material calculator to estimate the amount of rebar needed for your project. Make sure the installation team is ready for the installation and able to begin as soon as the truck arrives to avoid having it set up before the project can be completed and minimize idle time.

Tips For Ordering Concrete

Estimate how much concrete needed for a patio

Call your concrete supplier and tell them about your project and what the project is. Ask them to advise you on the proper mix given your application and region. They can tell you what will work best to support the strength requirements and freeze/thaw cycles in your region.

Consider additional costs for ready-mix concrete delivery. Typically, there are fees for delivery, weekend service, small loads, and overtime for long unloading times. Call your concrete supplier and understand these costs ahead of time and plan accordingly.

Order additional concrete for your project. The amount of overage you plan for will vary based on your quantity, but plan for at least 10% overage to accommodate spillage, settling, and grading inconsistencies. This will save you from a bad pour in the event that your estimates are even slightly off.

Using Bags of Concrete

Use bags of pre-mixed concrete for small projects or projects with many small pours

If your project is small you can use pre-mixed bags of concrete. Concrete bags come in 40 pound, 60 pound, or 80 pound bags. Mixing bags on-site can become difficult if you’re pouring a large slab or have many footings. Using concrete bags can be easier when you have many small pours or a small project where a truck is not practical or cost-effective.

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