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Inductance Calculator

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
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Transmission Line Geometries
square loop

Square Loop

two separate 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