exchange?

Assuming you're talking about the BT telephone exchange, www.samknows.com, but it'll only give you the distance in a straight line. There's no way for end users to directly find out their loop length.
 
Assuming you're talking about the BT telephone exchange, www.samknows.com, but it'll only give you the distance in a straight line. There's no way for end users to directly find out their loop length.

Rule of thumb is to double the straight line distance to get a more realistic distance. Obviously not everywhere is double the distance + some might be further away.
 
The BT rule of thumb is multiply by root 2, or the attenuation divided by around 10-15 (which assumes the line's copper).
As I said, there's no way to reliably find it, not that it's useful to you anyway.
 
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