Select the box with the geometry that
you would like to calculate. The round-wire
geometries are loops of wire with various shapes.
The transmission line geometries are cross sections
and the values calculated are the inductance per
unit length.

In all cases, the current is assumed
to flow in the outer surface of the conductors. The
approximate formulas used to calculate the
inductance are provided along with restrictions on
the relative size of the various parameters. These
formulas can be found in various texts and most of
them are derived in the book "Inductance
Calculations" by F. W. Grover.