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RC High-Pass Filter

Calculate, visualize, and hear a high-pass filter

First-order RC high-pass filter with live calculator, Bode magnitude/phase plots, and real-time audio demo. Fully client-side, no tracking.

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fc = 1 / (2πRC)

Calculator

Compute the cutoff frequency or solve for a missing component. Use SI units below for convenience.

Formula

fc = 1 / (2πRC)

At fc the output magnitude is -3 dB. The slope approaches +20 dB/dec from low to high frequencies.

  • Impedance of capacitor: |Xc| = 1 / (2πfC)
  • Transfer function: H(jω) = jωRC / (1 + jωRC)
  • Magnitude: |H| = ωRC / √(1 + (ωRC)²)
  • Phase: φ = arctan(1/(ωRC)) − 90°

Bode plots

Audio demo

Hear how the high-pass filter affects a tone or noise. The cutoff is synced to your calculator values by default.

Hz

Wet/Dry

Tip

Try a low frequency tone (e.g., 100 Hz) and increase the cutoff. You’ll hear bass roll off while highs pass through.