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.
one cubic foot (ft³)= 0.037037037037037 cubic yards (yd³) one cubic foot (ft³) = 0.028316846592 cubic metres (m³)
Side Length: 3 feet, 6 inches (3.5 feet converted to decimal) Depth: 4 inches
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
The perimeter P of an octagon is simply eight times the side length:
P = 8 * s
P = 8 * 3.5 = 28 feet
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
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.