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Concrete Calculator

Concrete Calculator

Select the area shape and enter its length, width, and height dimensions. The calculator will try to estimate the volume of concrete required to fill the area.


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Polygon Calculator







Flag Thickness:


Side Length a:


Number of steps:


Unit Price(Optional)




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Use this free concrete calculator to estimate how much concrete volume is required to fill up the different structures that are used in construction. If you are the one who is going to start construction of the new house or any other commercial project, then this read is something that can benefit you.

Let’s go through it!

What Is Concrete?

The concrete is the special construction material that is prepared by using the aggregate and the binding material. Here the binding material is the cement or lime. While on the other hand, the aggregate is the sand, mulch, or gravel.

Concrete is used in the construction process all over the world. Here the term portland cement is actually the main material that is used in the concrete to increase its strength. Usually in every construction, it takes almost 28 days for the concrete to become hard like a rock. This is why this is the most preferred material that is used in the construction. And our free concrete calculator is the best method that can be used to estimate how much concrete you need for the specific construction project.

How Many Bags of Concrete Do I Need?

This particular question comes into mind when you start constructing your home, office, plaza, or any other such building. But it is important for you to keep in mind the following key points when you start any construction:

  • At the very first, you need to determine the actual volume of the area for which you want to prepare concrete.
  • After that, go for measuring the dimensions of the premises such as length, width, and height. You can also determine the area of the property to calculate how much concrete you need for paving.
  • After that, you need to determine the weight of all the slabs one by one that are to be used. On the basis of this weight, you can get to know how many bags of concrete you actually need for the construction
  • With that, you must calculate how much concrete will be wasted during the whole process. With this value known, you can actually be able to estimate the most accurate amount of the concrete required for the project. Here our best concrete calculator will also provide you with the assistance of determining the actual concrete volume and the cost required to fill up the area.

Cost of the Concrete Bags:

Before starting a project, calculating concrete bags is the major element that will help you a lot in estimating the cost needed to run the project. A fast and reliable way that most of the contractors adopt is the use of concrete slab cost calculator. You justy ne to fetch the price of per concrete bag and the total area. You will instantly get the estimated price of the concrete slabs that are demanded for the area.

Concrete Volume Formulas:

Let us take you through the formulas of the concrete volume required for constructing various structures.

Square Slab:

square slab
$$ Volume\left(ft^{3}\right) = Height * Length * Width $$

Circular Slab:

circular slab
$$ Area\left(ft^{2}\right) = \pi * \left(\frac{Diameter}{2}\right)^{2} $$
$$ Volume\left(ft^{3}\right) = Depth * Area $$


$$ Volume\left(ft^{3}\right) = Height * Length * Width $$

For instance, try using a free online concrete slab calculator for most accurate results.

Square Column:

square column
$$ Volume\left(ft^{3}\right) = Height * Length * Width $$

In case you find it difficult, let the free quikrete concrete calculator do that for you.

Circular Column:

circular slab
$$ Area\left(ft^{2}\right) = \pi * \left(\frac{Diameter}{2}\right)^{2} $$
$$ Volume\left(ft^{3}\right) = Depth * Area $$



Keep in mind that:

  • The total number of steps in the platform represents the actual number of steps.
  • From the ground to the top of each section, we calculate the volume of each separate section.
  • Each single section comprises of the platform and the step

$$ \text{Volume Under Platform} \left(ft^{3}\right) = Width * \text{Platform Depth} * \left(\text{Rise Height} * \text{No. Of Steps}\right) $$

Now ignoring the platform, we will only focus on the steps. In the picture above, we have four steps.

Now we have:

$$ \text{Volume Under Each Step}\left(ft^{3}\right) = \text{Run Depth} * Width * \left(\text{Rise Height} * \text{Step Number}\right) $$

$$ \text{Total Volume} \left(ft^{3}\right) = \text{Volume Under Platform} \left(ft^{3}\right) + \text{Volume Under Each Step} $$

Gutters and Curbs:

gutters and curbs

Here we will again determine the volume of the concrete from the bottom step to the top one. We have two sections here that are curb and gutter, respectively.

$$ \text{Volume Under Curb} \left(ft^{3}\right) = \text{Curb Depth} * Length * \left(\text{Curb Height} + \text{Flag Thick\ckness}\right) $$

$$ \text{Volume Under Gutter} \left(ft^{3}\right) = \text{Gutter Width} * Length * \text{Flag Thickness} $$

$$ \text{Total Volume} \left(ft^{3}\right) = \text{Volume Under Curb} \left(ft^{3}\right) + \text{Volume Under Gutter} \left(ft^{3}\right) $$

Conversion In Other Units:

Below we have a couple of formulas that are used to convert the cubic feet of the concrete to cubic yards and cubic meters as below:

Cubic Yards:

$$ Volume\left(yd^{3}\right) = \frac{\text{Volume In Cubic Feet}}{27} $$

Cubic Meter:

$$ Volume\left(m^{3}\right) = \text{Volume In Cubic Feet} * 0.0283 $$

Our best online concrete calculator also makes use of the same formulas above defined to perform most accurate estimations.

How Many Bags of Concrete In A Yard Are Needed?

The standard unit in which the concrete volume is measured is cubic yard. Below is the table that actually goes for the right values of the weight that are required to fill up some standard yardages:

Bags Per Yard
Baggage Weight (lb) Bags Per Yard
40 90
50 72
60 60
80 45


Our free concrete bag calculator will let you know how much of the cement bags will be best for the total volume of the concrete needed.

Types of Concrete:

Let us have a look of the following types of the concrete below along with their densities:

Type Density (kg/m³)
Ordinary  2400
Light Weight <1920
High Density 3000-4000
Reinforced  2500
Precast  2400
Prestressed  2330
Air-Entrained  2535
Glass  2620
Rapid Hardening 2250
Asphalt  1950
Lime  2080
Roller Contracted 2400

How To Calculate Concrete?

What about if we resolve an example here? Yes, we are going to do so that you understand what we are discussing exactly. Let us go!

Example # 01:
A contractor has started a project in which about 5000 concrete circular slabs are needed. The diameter of the slab is about 2ft and expected depth is about 5 inches. How to figure concrete required to make 5000 circular slabs?

Here we have:
$$ Area\left(ft^{2}\right) = \pi * \left(\frac{Diameter}{2}\right)^{2} $$

$$ Area\left(ft^{2}\right) = 3.14 * \left(\frac{2}{2}\right)^{2} $$

$$ Area\left(ft^{2}\right) = 3.14ft^{2} $$

$$ Volume\left(ft^{3}\right) = Depth * Area $$

$$ Volume\left(ft^{3}\right) = 5 * 3.14 $$

$$ Volume\left(ft^{3}\right) = 15.14ft^{3} $$

How Concrete Calculator Works?

Make use of this free concrete estimator to estimate the most accurate volume of the concrete for various structures. Want to know how to do that swiftly? Let us guide you thoroughly!


  • Make a selection of the structure for which you want to calculate concrete
  • After you select the desired structure, enter all the values of the parameters given against the chosen element
  • As well, choose the units in which you want to get the results
  • Also, you can calculate the payment that is an optional element in the calculations and select the units in which you want to make calculations

The free concrete cost calculator calculates:

  • Volume of concrete in cubic feet
  • Volume of concrete in cubic yards
  • Volume of the concrete in cubic meters
  • Concrete bag amounts required to fill up the area depending upon the weight increase
  • How much does concrete cost


What is the main difference between cement and concrete?

Most of the time, concrete and cement are used interchangeably. Cement is the element of the concrete and concrete is the material that consists of cement and other materials like gravel etc. if we talk about the cement alone, it is almost 10-15% of the total concrete volume. But concrete contains 100% of the cement. You can make use of the cement calculator to determine how much of it is present in the concrete volume you are having.

Which concrete is the strongest?

Ultra-High Performance Concrete is the type that is supposed to be the strongest among all concrete types. It has a strength of minimum 17000 pounds per square inch.

Which is better, concrete or cement?

As you know that the concrete contains cement as well, that is why it is a preferred choice to use concrete instead of cement if there is a large project going on.

What is the standard concrete slab thickness?

The standard slab thickness for residential construction is about 4 inches. While for commercial projects, heavy slabs of almost 6 inches in thickness are used. Also, the concrete calculator is used by contractors to estimate how much concrete would be needed to prepare a slab.

Why is clay not used in the concrete?

Clay particles have the ability of absorbing more water and get thick or swell. That is why use of clay is prohibited in concrete making just due to a high demand of water.

How many 80lb bags of concrete in a yard?

There are exactly 45 bags of 80lb concrete that are needed to fill up in a yard. Also, you can also use a concrete calculator to know how the number of bags vary depending upon the weight of the concrete for a single yardage area.

Concrete or asphalt, which one is better?

It is concrete that is more reliable than the asphalt. The reason is that concrete is more solid. When it freezes, it gets cracked at many points. But the greatest advantage of using concrete is that it is more durable in case of any damage to the construction.

What is the average life of the concrete?

If the sufficient amount of the concrete is used for larger projects, then its average life would be approximately 100 years. That is why you must use a concrete yard calculator to estimate what would be the optimum ratio of the cement and other materials in concrete to increase its life.

How do you strengthen concrete without using rebar?

If you want to increase the strength of the concrete without using rebar, try using wire mesh that is not only cheap enough but also makes the concrete too stiff like a rock.

How much concrete do I need if the dimensions of the square slab are 2ft, 4ft, and 6ft respectively?

You will need exactly 48ft3 of concrete for the desired slab construction. In case you are not capable of doing so manually, let the best concrete calculator do that for you.


Concrete is the most powerful element for commercial project construction. Because of the longevity, super strength, durability, and solidness, it is the material that is widely used to construct huge buildings, pavements, sidewalks, and many other such projects. This is why contractors make use of the concrete calculator to estimate how much concrete will be wasted and how much will be the actual quantity of worth.


From the source of Wikipedia: Concrete, History, Composition, Aggregates, Production, Alternative types, Properties,Construction with concrete, Circular economy

From the source of Cost of a Concrete Slab, Square Foot Concrete, Concrete Pad Load, Rust Stains From Upholstery

From the source of Measuring a Cubic Foot