The inductance of a flat or ribbon wire (rectangular cross section), can be found using the calculator or the equation given below.

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The inductance of a flat or ribbon wire or a track on a PCB can be calculated with the following equation.

Where l is the Length in cm

w is the Width in cm

t is the thickness in cm (PCB copper @ 1 oz/ft2 = 0.035mm)

The original for this equation is by F.E. Terman and can be found
in the * Radio Engineers Handbook*, McGraw-Hill, New York,
1945. The units in the calculator have been changed from µH to nH
and the thickness from cm to mm for easier working on PCB's.