basic

RLC Bandwidth from Resonant Frequency and Q Calculator

Δf = f₀ / Q (full-width at half-power).

Compute the −3 dB bandwidth Δf of an RLC resonant circuit: Δf = f₀ / Q, where f₀ is the resonant frequency and Q is the quality factor. The pass-band runs from f₀ − Δf/2 to f₀ + Δf/2. High-Q filters have narrow passbands; low-Q ones broad passbands.

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

Hz

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Δf = f₀ / Q; passband = [f₀ − Δf/2, f₀ + Δf/2].

In depth

Compute the −3 dB bandwidth Δf of an RLC resonant circuit: Δf = f₀ / Q, where f₀ is the resonant frequency and Q is the quality factor. The pass-band runs from f₀ − Δf/2 to f₀ + Δf/2. High-Q filters have narrow passbands; low-Q ones broad passbands.