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Circular Slab Concrete Calculator

Calculator For Circular Slab

The Circular Concrete Slab Calculator determines a circular slab's area, perimeter, and required concrete volume based on your defined diameter and depth values. This tool is ideal for calculating materials needed for projects like patios, walkways, and other concrete-based surfaces, ensuring accurate estimations and reducing material waste.

Circular Concrete Slab

Diameter ft in
Depth in
     
Square Footage of Slab ft²
Perimeter of Slab ft
Amount of Concrete Needed in:
Cubic Feet ft ³
Cubic Yards yd ³
Cubic Metres m³

Calculator

  1. enter the diameter of the slab in feet
  2. slab depth in inches

Results

  1. the area of the slab calculated in square feet
  2. the circumference (perimeter) of the slab in feet
  3. amount of concrete needed in cubic feet
  4. concrete needed in cubic yards
  5. concrete needed in cubic metres
Formulas
Area 
A = π * D²  ÷ 4

Perimeter 
P = π * D

Volume 
V = π * D² ÷ 4 * (d ÷ 12)

where A is the area in square feet, p = 3.14159265358979, D = diameter of circle
P is the perimeter in lineal feet, p = 3.14159265358979, D = diameter of circle
V is the volume in cubic feet, p = 3.14159265358979, D = diameter of circle, d = depth of slab in inches ÷ 12 converting this to feet

To convert cubic feet to cubic yards, multiply cubic feet * 0.037037037037037
To convert cubic feet to cubic metres, multiply cubic feet * 0.028316846592
To convert cubic yards to cubic metres, multiply cubic yards * 0.764554857984
Example calculation
Diameter of slab = 12 feet
depth of slab = 4 inches

Area
Calculate the area in square feet using the Area formula; 
3.14159 * 12² ÷ 4 = 3.14159 * 144 ÷ 4 = 113.1 (rounded to one digit)
The area of the slab is 113.1 square feet


Perimeter
Calculate the circumference (perimeter) of this slab using the Perimeter formula; 
3.14159 * 12 = 37.6 (rounded to one digit)
This slab has a circumference of 37.7 feet


Volume
Calculate the amount of concrete you need for this slab using the Volume formula; 
3.14159 * 12² ÷ 4 * (4 ÷ 12 ) = 3.14159 * 144 ÷ 4 * 0.333 = 37.7 (rounded to one digit)
The volume of this slab is 37.7 cubic feet

You will need 37.7 * 0.037 = 1.4 cubic yards of concrete to pour this slab.

This calculator ensures accurate concrete volume estimation, helping you determine the amount needed for construction.

When Ordering Concrete

This concrete calculator will help you in estimating the amount of concrete needed for your project. The amount given as needed does not include any waste. Depending on your job, we recommend adding anywhere from an extra 4% to 10% to your concrete required calculation to make sure you have enough concrete to finish the job. Ask when ordering the concrete. They will be able to give you a good idea of what is needed.

Concrete Volume Calculators

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