Concrete Calculator

The Concrete Calculator is developed for estimating and planning concrete-related projects including slabs, walls, columns, footings, stairs, and curbs. The Concrete Calculator provides accurate measurements based on length, width, depth, and quantity. Also enter the price to calculate the total volume and cost of materials when you enter the price per cubic foot, price per cubic yard, or price per cubic meter.

What Is Concrete?

"The concrete is the special construction material that is prepared by composing of a mixture of cement, water, and aggregates such as sand, gravel, or crushed stone"

When the water and cement mix, they form a paste that coats the surface of the aggregates and binds them together into a solid, durable mass.

Concrete Volume Formulas:

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

Square Slab:

Volume (ft³) = Height * Length * Width

Circular Slab:

Area (ft²) = π * (Diameter / 2)²

Volume (ft³) = Depth * Area

Wall:

Volume (ft³) = Height * Length * Width

Square Column:

Volume (ft³) = Height * Length * Width

Circular Column:

Area (ft²) = π * (Diameter / 2)²

Volume (ft³) = Height * Area

Stairs:

Keep in mind that:

• 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

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

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

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:

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.

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)

Types of Concrete:

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

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!

Practical Example:

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?

Answer:

Step 1: Calculate Area

Area (ft²) = π * (Diameter / 2)²

Area = 3.14 * (2 / 2)² = 3.14 ft²

Step 2: Calculate Volume for One Slab

Volume (ft³) = Depth * Area

Note: 5 inches = 5/12 ft ≈ 0.416 ft

Volume = 0.416 * 3.14 = 1.31 ft³

Step 3: Calculate Total Volume for 5000 Slabs

Total Volume = 1.31 * 5000 = 6550 ft³