CMM Stair Rail Calculator

CMM, Inc.

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About this app

This is a specialized app for contractors building picket-fence stair rails. The app calculates the sizes and positions of the holes to cut, as well as other useful details.

This app calculates the following information for stair rails:
- Rise
- Run
- Angle
- Rail length
- Spacing between pickets
- Number of pickets
- Spacing between holes on rail
- Height of holes on rail and on post
- Cut position and angle for cutting rail ends vertically

Convenient diagrams make it easy to enter your measurements in the app.

After doing a calculation, simply tap the Share button to share your results (via text or email), save them to a note-taking app, or copy them to the clipboard.

For many years, CMM has been a nationwide leader in industrial automation equipment for fence and rail manufacturing. Our MotionFORCE software is in use on thousands of automated routing machines across the United States and worldwide. Now, with this app, we're pleased to offer one of the features of MotionFORCE completely free!

Stay tuned for more exciting apps from CMM!

What’s new

v26.4.0:
- Updated design
- Design-related bug fixes
- Security updates

v26.1.0:
- App now calculates height of holes in each post.
- App now shows position and angle needed for cutting rail ends vertically.
- Entering a post width and post wall thickness is now required. This allows for calculation of post hole height, and allows app to detect if insertion distance is impossibly large.
- Results screen now saves your length-unit preference.
- Improved backspace functionality.