L-C Filter Equations

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This page contains the basic equations for an L-C filter. The filter is comprised of the inductor (L) and capacitor (C). A web calculator is provided so you can compute the cut-off frequency and characteristic impedance of your own filter.

Cut-Off Frequency

F = 1/(2*PI()*SQRT(L*C))

Characteristic Impedance

Z = SQRT(L/C)

Web Calculator

User Inputs:

L = [H]

C = [F]

Results:

F = [Hz]

Z = [Ohms]

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Written 11/14/05
Last updated 6/20/06

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