This program computes the electrical self inductance of various shapes and sizes of air core coils. Geometries include circular solenoidal current sheet, straight round wire, N-turn circular loop, circular toroid with circular winding, multi-layer square solenoid, circular toroid with rectangular winding, multi-layer circular solenoid, single-layer circular solenoid of round wire, single-layer square solenoid. Wire gauge calculation and dimensions in inches or centimetersare included.

The formulas for a multi-layer circular solenoid were obtained from National Bureau of Standards publications and are very accurate. They work for arbitrary winding thickness and length. A flat spiral disc coil is obtained by setting the length = 0. Also very precise is the NBS formula for a helical solenoid of round wire. It models the size of the wire and the nonuniform
current density inside the wire. In the case of a single-turn loop or a straight piece of wire, a
skin effect correction is computed. This requires that you enter the frequency of operation. The wire is then assumed to have the conductivity of copper. The inductance formulas are derived from the works of Butterworth, Dwight, Grover, Lyle, Nagaoka, Rosa, Snow, and Speilrein.

Included in the archive are a DOS executable program and C language source code.
Build scripts for the program are provided for Microsoft Visual C, Borland C 4.5,
VAX C, MSC, and unix systems. The program runs as a command line application.
Options and values are entered in a menu-style display format.