Pevlika Browser Apps

Filter Cutoff Frequency Calculator

−3 dB cutoff frequency of first-order RC and RL filters.

Runs in your browser — nothing is uploaded
Filter

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For learning, hobby and prototyping use. Not professional electrical design advice — follow applicable codes and standards.

How to use Filter Cutoff Frequency Calculator

  1. Enter your values — the unit for each field is shown next to it.
  2. The result updates instantly as you type.
  3. Copy the results, or change inputs to compare scenarios.

Formula & assumptions

RC: fc = 1 / (2πRC)

RL: fc = R / (2πL)

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