Thin Walled Circle - Geometric Properties
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The above thin walled circle 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
Need an 
spreadsheet for designing the above shape, click here!
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, in2 or mm2
- C = Distance to Centroid, in or mm
- I = Second moment of area, in4 or mm4
- Ji = Polar Moment of Inertia, in4 or mm4
- J = Torsional Constant, in4 or mm4
- K = Radius of Gyration, in or mm
- P = Perimeter of shape, in or mm
- r = radius of circle, in or mm
- S = Plastic Section Modulus, in3 or mm3
- t = wall thickness (where t << r), in or mm
- Z = Elastic Section Modulus, in3 or mm3
Online Thin Walled Circle 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:
- Area of a Thin Walled Circle
- Perimeter of a Thin Walled Circle
- Centroid of a Thin Walled Circle
- Second Moment of Area (or moment of inertia) of a Thin Walled Circle
- Polar Moment of Inertia of a Thin Walled Circle
- Radius of Gyration of a Thin Walled Circle
- Elastic Section Modulus of a Thin Walled Circle
- Plastic Section Modulus of a Thin Walled Circle