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.

Calculate for:






Number of steps



Unit Price (Optional):



Concrete Calculator Images






Estimate the volume and weight of concrete that you need to complete a construction project. It is a good option to use a little higher quantity of material to avoid any shortage issues on the job site.

Our concrete calculator will determine the concrete material quantity and cost to purchase it accurately. With that, the tool will also help you in calculating concrete bags subjected to different concrete weights.

Get calculations in different units of measurement to ensure precision.

Composition of Concrete:

Component Percentage
Cement 10%
Air 20%
Sand 30%
Gravel 40%

How Much Concrete Do I Need?

It depends upon the type of project. Whether you are constructing a concrete slab, footings, steps, or columns, the amount of material will differ always. Using the concrete calculator can give you an instant estimation of the concrete that you require to complete your earthwork project.

The important aspect that is worth considering here is the shape of the area. Once you measure the dimensions of the land, it becomes easier to predict the cement material accordingly. But the situation holds until you are dealing with basic shapes like rectangles, squares, triangles, etc. When it comes to areas with irregular dimensions, the task becomes tricky.

In this situation, you can divide the area into smaller portions that match different basic geometrical shapes supported by concrete calculator provides calculations. After that, you can add up all small calculations and get the concrete volume for the overall land area.

Consider Extra Quantity Always:

When mixing or pouring concrete, chances are that some ratio of it may be wasted. This is why you should prefer making 5-6% extra concrete so you can complete your project without running out of concrete.

How To Calculate The Concrete You Need?

Square Slab:

Volume (ft³) = Height * Length * Width

Round Slab:

Area (ft²) = π (Diameter²)/4

Volume (ft³) = Depth * Area


Volume (ft³) = Height * Length * Width

Square Column:

Volume (ft³) = Height * Length * Width

Circular Column:

Area (ft²) = π (Diameter²)/4

Volume (ft³) = Depth * Area


Volume Under Platform (ft³) = Width Platform Depth (Rise Height * No. Of Steps)

Volume Under Each Step (ft³) = Run Depth Width (Rise Height + Step Number)

Total Volume (ft³) = Volume Under Platform (ft³) + Volume Under Each Step

Gutters and Curbs:

Volume Under Curb (ft³) = Curb Depth * Length * (Curb Height + Flag Thickness)

Volume Under Gutter (ft³) = Gutter Width * Length * Flag Thickness

Total Volume (ft³) = Volume Under Curb (ft³) + Volume Under Gutter (ft³)

Properties of Concrete:

Dry Density (kg/m3) 7-day Compressive Strength (N/mm2) Thermal Conductivity* (W/mK) Modulus of Elasticity (kN/mm2) Drying contraction (%)
400 0.5 – 1.0 0.10 0.8 – 1.0 0.30 – 0.35
600 1.0 – 1.5 0.11 1.0 – 1.5 0.22 – 0.25
800 1.5 – 2.0 0.17 – 0.23 2.0 – 2.5 0.20 – 0.22
1000 2.5 – 3.0 0.23 – 0.30 2.5 – 3.0 0.18 – 0.15
1200 4.5 – 5.5 0.38 – 0.42 3.5 – 4.0 0.11 – 0.19
1400 6.0 – 8.0 0.50 – 0.55 5.0 – 6.0 0.09 – 0.07
1600 7.5 – 10.0 0.62 – 0.66 10.0 – 12.0 0.07 – 0.06

How Does This Concrete Calculator Function?

The tool works to give you instant outputs by considering certain related parameters that are necessary for the calculations. These include:

What You Need To Enter?

  • Type of Project: Select the slab for which you want to calculate concrete
  • Dimensions: Enter accurately measured dimensions of the slab and select relate units
  • Quantity: If you want to estimate cement quantity for more than one slab, enter the number in the required field
  • Cost (Optional): Enter the unit price in its related field

What You Will Get?

  • Volume Calculations: Know how many yards of concrete you need. 
  • Adjustments: You will get concrete estimations in terms of other related units (cubic feet and cubic meters).
  • Weight Needed: Exact concrete weight (lbs or kgs) calculations for required volume.
  • Number of Bags: The calculator gives you an instant idea of how many concrete bags are needed to pour a slab for varying weights.
  • Concrete Cost: Get the overall purchase cost of concrete that you need to pay for the accomplishment of the project.

Frequently Asked Queries:

What Is The Benefit of The Concrete Calculator?

With our concrete slab calculator, you no longer have to deal with complicated calculations that are involved in estimations. The tool does the task very efficiently to give you precise values in less than a second.

How Many Yards of Concrete Do I Need For a 24x24x4 Slab?

For a 24x24x4 concrete slab, you need 0.59 cubic yards of concrete volume. The weight against this volume is about 958.5 kg.

What Is The Ratio For Mixing Concrete Calculator?

General Mix:

Concrete Type Ratio
All In Ballast 1:5
Cement:Sharp Sand:Gravel 2 ½:3 ½

Paving Mix:

Concrete Type Ratio
Cement:All In Ballast 1:3 ½
Cement:Sharp Sand:Gravel 1:1 ½:2 ½

How Many Sizes Does a Concrete Come In?

A normal concrete slab has a face of about 8 inches by 10 inches (203mm by 406mm). The available thickness in these sizes includes 4, 6, 8, 10, 12, 14, and 16 inches.

What Is The Strongest Concrete Mix Ratio?

The strongest concrete material ratio is 1:2:3:0.5.

How Many Bags of Concrete Do I Need?

  • First of all, calculate cubic feet of concrete
  • Multiply cubic feet by 0.037 to get cubic yards
  • Finally, multiply total cubic yards by cubic yards per single bag

To get these estimations without any error involved, you can use the concrete bag calculator.

How Many Bags of Concrete Make a Yard?

As calculated from concrete yard calculator, you need:

  • 75 bags - Each weighing 50 pounds
  • 60 bags - Each weighing 60 pounds
  • 45 bags -Each weighing 90 pounds