Octagon Shaped Slab Concrete Volume

Calculator for Octagon shapes

The Octagon Shaped Slab Concrete Volume Calculator helps determine essential measurements for a concrete slab in the shape of an octagon. By entering the side length and depth, you can calculate the slab's surface area, perimeter, and required concrete volume in cubic feet, cubic yards, and cubic metres, ensuring accurate material ordering for construction projects.


Octagon Shaped Volume Calculator

Side Length:   ft  in
Depth:   in
Area:   ft ²
Perimeter:   lin ft

Amount of concrete needed:

Cubic Feet:   ft ³
Cubic Yards:   yd ³
Cubic Metres:   m ³

Calculator

  1. enter the length of a side in feet
  2. the slab thickness (depth) in inches

Results

  1. the area of the slab in square feet
  2. the perimeter of the slab in lineal feet for forming material
  3. the amount of concrete needed in cubic feet
  4. concrete needed in cubic yards
  5. required concrete in cubic metres

Conversions

one cubic foot (ft³)= 0.037037037037037 cubic yards (yd³)
one cubic foot (ft³) = 0.028316846592 cubic metres (m³)

Formula and Example Calculation

Side Length: 3 feet, 6 inches (3.5 feet converted to decimal)
Depth: 4 inches
Calculate the Area:
The area A of a regular octagon with side length s can be found using the formula:
A = 2 * (1 + √2) * s²
A = 2 * (1 + √2) * 3.5²
A = 2 * 2.414 * 12.25 = 59.143 square feet
Calculate the Perimeter:
The perimeter P of an octagon is simply eight times the side length:
P = 8 * s
P = 8 * 3.5 = 28 feet
Calculate the Volume of Concrete Needed:
The volume V of concrete is the area multiplied by the depth (converted to feet):
V = A * depth in feet
Convert depth from inches to feet:
Depth in feet = 4 ÷ 12 = 0.3333 feet
Calculate the volume:
V = 59.143 * 0.3333 = 19.712 cubic feet
19.712 * 0.037037037037037 = 0.730 cubic yards
19.712 * 0.028316846592 = 0.5581 cubic metres
Results
Area: 59.2 square feet
Perimeter: 28 feet
Concrete Volume:
19.7 cubic feet
0.73 cubic yards
0.56 cubic metres

This Octagon Shaped Slab Concrete Volume Calculator provides accurate measurements for your slab needs, supporting efficient planning and concrete ordering.



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.

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