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Inductance Calculations

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.

Round-Wire Loop Geometries  Transmission Line Geometries
square loop
Square Loop
two seperate wires
Twin Lead
rectangular loop
Rectangular Loop
a wire over a ground plane
Round Wire over a Ground Plane
circular loop
Circular Loop
two vertically seperate traces
Two Vertically Spaced Traces
equilateral triangle loop
Equilateral Triangle Loop
A Trace over a Ground Plane
Wide Trace over Ground Plane
Isosceles Triangle Loop
Isosceles Triangle Loop
two horizontally separated traces
Coplanar Traces