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    Air Core Inductor Coil Inductance Calculator

    The following is a design tool which calculates the inductance of an air core inductor.

    d (coil diameter in inches)
    l (coil length in inches)
    n (number of turns)
    Inductance

    Equations

    L= (d^2 * n^2)/(18d+40l)

    where:

    L is inductance in micro Henrys,
    d is coil diameter in inches,
    l is coil length in inches, and
    n is number of turns.

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