RC Filter Cutoff Frequency Calculator (Low-pass / High-pass)
Signal processing and audio electronics tool. Models unwanted frequency attenuation in first-order passive RC circuits.
Input Parameters
Instant Calculation Result
Adjust values on the left to calculate live results.
In-Depth Guide & Mathematical Methodology
📻 RC Filter Formulas & Cutoff Point
Cutoff Frequency (fc): fc = 1 / (2 × π × R × C)
Time Constant (τ): τ = R × C
At Cutoff Frequency: Signal amplitude drops to 70.7% (-3dB attenuation).
Frequently Asked Questions (FAQ)
What is the RC Filter Cutoff Frequency Calculator (Low-pass / High-pass) and how does it work?
Signal processing and audio electronics tool. Models unwanted frequency attenuation in first-order passive RC circuits.
How do I use this RC Filter Cutoff Frequency Calculator (Low-pass / High-pass)?
Enter Resistor Value ($R$ in Ohms - Ω or kΩ). Enter Capacitor Capacitance ($C$ in Nanofarads nF or Microfarads $\mu$F). View Calculated Cutoff Frequency ($f_c$ in Hz or kHz) and Time Constant ($\tau$ in ms).
What mathematical formula is used in this calculation?
Cutoff frequency fc = 1 / (2 * π * R * C). Time constant τ = R * C (in seconds). 1 nF = 10⁻⁹ F.
Is the RC Filter Cutoff Frequency Calculator (Low-pass / High-pass) on FindCalculator free to use?
Yes, all 330+ interactive tools on FindCalculator.online are 100% free, run directly in your browser without registration, and do not store your private calculation data.