Reply To: Determining the length of an edge ring

If you want to go the python route:

import bpy
# Get the active object
obj = bpy.context.active_object
# Check if the object is a mesh
if obj.type == 'MESH':
    # Enter edit mode
    bpy.ops.object.mode_set(mode='EDIT')
    total_length = 0
    # Get the selected edges
    edges = [e for e in obj.data.edges if e.select]
    # Calculate the length of each selected edge
    for edge in edges:
        v1 = obj.data.vertices[edge.vertices[0]].co
        v2 = obj.data.vertices[edge.vertices[1]].co
        length = (v2 - v1).length
        #add the edge lengths together
        total_length = total_length+length
    #Print the total length to the console
    print(f"Total length: {total_length}")

This will output the total length of selected edges. I don’t know why but for some reason you have to go to object mode and back into edit mode for blender to detect the change to the selected edges. It’s probably because of my method of determining selected edges. It’s the only thing I could come up with. So, I added a mode set to edit. This way you can just select your edges tab to object mode and run the script. Now that I’m typing this I could have just switched to object mode instead. I think. 

bpy.ops.object.mode_set(mode='OBJECT')

I haven’t tested that. The script does work in object mode. For windows user to access the console click windows->Toggle System Console. For Linux user you can add “-con” without the quotes after running ./blender in the terminal or if you have a menu item or desktop icon you can check run in terminal for the launchers properties. Sorry, Mac people I don’t know on Mac, but I do know you can use the -con in terminal mode. 

***Edit*** It works. So here is the change so you don’t have to tab to object mode.

import bpy
# Get the active object
obj = bpy.context.active_object
# Check if the object is a mesh
if obj.type == 'MESH':
    # Enter edit mode
    bpy.ops.object.mode_set(mode='OBJECT')
    bpy.ops.object.mode_set(mode='EDIT')
    total_length = 0
    # Get the selected edges
    edges = [e for e in obj.data.edges if e.select]
    # Calculate the length of each selected edge
    for edge in edges:
        v1 = obj.data.vertices[edge.vertices[0]].co
        v2 = obj.data.vertices[edge.vertices[1]].co
        length = (v2 - v1).length
        #add the edge lengths together
        total_length = total_length+length
    #Print the total length to the console
    print(f"Total length: {total_length}")