Online Inductance Calculators

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "David Thomson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <dave-at-volantis-dot-org>

With regards to the calculation of inductance for a flat spiral coil in air,
I found this online calculator.  Check it out...
http://emcsun.ece.umr.edu/new-induct/circular.html

Using a permeability of 1 for air, I came up to 63mH for my 224 turn coil.
This is much closer to the measurements I have been taking.  This formula
comes from a page of all kinds of inductance formulas at...
http://emcsun.ece.umr.edu/new-induct/

Tell me what you think.

Dave