# Circular Slab Concrete Calculator

Calculate the amount of concrete needed in cubic feet and cubic yards for a slab in the shape of a circle.

To be able to calculate the concrete volume needed for this type of slab your need to know the diameter of the circle and the depth of this slab. ### Formula's used:

Area
A = π * D² ÷ 4
where A is the area in square feet, π = 3.14159265358979, D = diameter of circle

Perimeter
P = π * D
where P is the perimeter in feet, π = 3.14159265358979, D = diameter of circle

Volume
V = π * D² ÷ 4 * (d ÷ 12)
where V is the volume in cubic feet, π = 3.14159265358979, D = diameter of circle, d = depth of slab in inches ÷ 12 converting this to feet

Example calculation for volume:
```Diameter of slab = 12 feet
depth of slab = 4 inches
3.14159265358979 * 12 * 12 ÷ 4 ( 4 ÷ 12)
113.09 * 0.333 =  37.7 cubic feet of concrete needed for this circular slab```
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

### 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

#### Calculation

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

#### Results

1. square footage of slab
2. perimeter of slab
3. amount of concrete needed in cubic feet
4. concrete needed in cubic yards
5. concrete needed in cubic metres

### 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. It is recommended, depending on the job you are doing, to add anywhere from an extra 4% to 10% to your concrete order 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.