The Rib Scale Calculator by Ken Eschete and Dr. Daniel R Moore is an Excel spreadsheet that aids in the conversion from flat ribs to crowned ribs. Enter the original rib dimensions to discover the mass and stiffness of each rib, then enter the desired changes in radius crown, new length (if adding cutoff bar), new height, and width. The resulting changes in mass and stiffness are automatically calculated for comparison to the original ribs. You can then manipulate the new dimensions to find a desirable result.
This calculator does not give a specific rib scale.