I don't think you want to calculate the inductance of a trace if it is 9-10 inches long. You probably want to consider its impedance and prop delay instead. -----Original Message----- From: Herrin, Bradley T [mailto:bradley.t.herrin@xxxxxxxxx] Sent: Tuesday, October 22, 2002 12:09 PM To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Need a tool to calculate trace inductance. Hi there- I could use some help and was referred to this list. I am trying to calculate the inductance or a trace on an inner layer of a board with 1 Oz copper. The trace is 9 to 10 inches long and is approximately 4 t o4.5 inches wide. The layer is using 1 Oz copper. Does anyone have the equation or tool similar to Ultracad to calculate this inductance value? Thanks in advance Brad ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu