If you need a beam's moments of inertia, cross sectional area, centroid, or radius of gyration, you need this app. This app was created to assist you in these calculations and to ensure that your beam section calculations are fast and accurate. Simply select from the available geometries, enter in the required dimensions and the answers will be generated complete with the formulae. You can also easily print or email a PDF of your results along with a schematic of the beam's cross section.

Moments of Inertia Features:
- Designed for use on all sizes of the iPhone, iPod Touch, and iPad
- Extremely flexible unit system that has the ability to perform unit conversions on the output
- Save multiple cases of each solution for later reference
- Printing Capability
- Ability to email a PDF of the Cross Section Schematic, Inputs, Equations, and Results

The properties calculated include are:
- Moments of Inertia about the x & y axes
- Polar Moment of Inertia
- Radius of Gyration
- Centroids
- Area
- Section Modulus

Moments of Inertia calculates the properties and displays the equations for many sections including:
• Rectangles
• Hollow Rectangles
• Circles
• Hollow Circles
• Semicircles
• Quarter Circles
• Ellipses
• Triangles
• I Beams
• Tee Sections
• Channel Sections
• Unequal-Legged Angle

Check out our other engineering apps by searching the iTunes store for:
• Pressure Vessel Pro
• Mohr's Circle
• Stress Concentrations Pro
• Stress Intensity Factors Pro
or search J.R.Hobbs to see them all.

What’s New

Version 2.1.4

- Bug fixes.
- Other minor updates.

Ratings and Reviews

1.0 out of 5
1 Rating

1 Rating

bigthing ,

Moment of inertia

Not working!

faader4100 ,

Practical engineering

Great set of easy and quick use of established formula

Hats off to Mr Hobb

Jorge Contreras Ramos ,

Nice tool

Nice tool for mechanical engineer.

App Privacy

The developer, J.R.Hobbs, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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