Octagon  Geometric Properties
Geometric Property Calculator  



The above octogon property calculator is based on the provided equations and does not account for all mathematical limitations. The calculator has been provided with educational purposes in mind and should be used accordingly. Unit conversion
Notation and Units
Metric and Imperial Units
The above formulas may be used with both imperial and metric units. As with all calculations care must be taken to keep consistent units throughout. Examples of units which are typically adopted are outlined below:
Notation
 A = Geometric Area, in^{2} or mm^{2}
 C = Distance to Centroid, in or mm
 d = Flat to flat distance, in or mm
 I = Second moment of area, in^{4} or mm^{4}
 J_{i} = Polar Moment of Inertia, in^{4} or mm^{4}
 J = Torsional Constant, in^{4} or mm^{4}
 K = Radius of Gyration, in or mm
 P = Perimeter of shape, in or mm
 r = Outer radius of shape, in or mm
 S = Plastic Section Modulus, in^{3} or mm^{3}
 Z = Elastic Section Modulus, in^{3} or mm^{3}
Online Octagon Property Calculator
Using the structural engineering calculator located at the top of the page (simply click on the the "show/hide calculator" button) the following properties can be calculated:
 Calculate the Area of a Octagon
 Calculate the Perimeter of a Octagon
 Calculate the Centroid of a Octagon
 Calculate the Second Moment of Area (or moment of inertia) of a Octagon
 Calculate the Polar Moment of Inertia of a Octagon
 Calculate the Radius of Gyration of a Octagon
 Calculate the Elastic Section Modulus of a Octagon
 Calculate the Plastic Section Modulus of a Octagon