All online tools use javascript to calculate the dimensions. Use at your own risk. If the answers look wrong then verify the answers with a calculator.

This clipped hip octagon bay window rafter script - calculator will return the octagon baywindow geometry angles and trigonometry rafter measurements for a clipped hip octagon baywindow roof framing. The script is limited to 45° baywindow calculations.

 

clip-octagon.dxf -- auto generated DXF CAD file of clipped hip octagon baywindow drawing each time script is run
clip-octagon.pl source code for perl script that generates these octagon baywindow calculations
dxf_header.txt DXF header text file used by this script