Circular Slab Concrete Calculator

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.

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

A = π * D²  ÷ 4

P = π * D

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

3.14159 * 12² ÷ 4 = 3.14159 * 144 ÷ 4 = 113.1 (rounded to one digit)

The area of the slab is 113.1 square feet

3.14159 * 12 = 37.6 (rounded to one digit)

This slab has a circumference of 37.7 feet

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.

Shapes using Imperial & Metric Measurements