Cutoff Frequency Calculator

Cutoff Frequency Calculator for RC and RL Circuits

The Cutoff Frequency Calculator from EngLab is a free online tool designed for students, engineers, and electronics enthusiasts to quickly calculate the cutoff frequency (f_c) of RC circuits and RL circuits. By entering the resistance (R) and either capacitance (C) or inductance (L), you can determine the frequency at which the circuit attenuates the input signal by 3 dB.

Why Calculate Cutoff Frequency?

Understanding the cutoff frequency is essential in filter design, signal processing, and electronics circuit analysis. This value helps determine the frequency response of low-pass or high-pass filters and is crucial for designing RC and RL circuits for precise signal filtering.

Formulas Used in This Calculator

• RC Circuit: f_c = 1 / (2πRC) — calculates the cutoff frequency in Hertz based on resistance and capacitance.
• RL Circuit: f_c = R / (2πL) — calculates the cutoff frequency in Hertz based on resistance and inductance.

How to Use the Cutoff Frequency Calculator

1. Enter the resistance (R) in ohms, kiloohms, or megaohms.
2. Provide the capacitance (C) in farads, millifarads, microfarads, nanofarads, or picofarads for an RC circuit.
3. Provide the inductance (L) in henrys, millihenrys, or microhenrys for an RL circuit.
4. The calculator instantly displays the cutoff frequency for the selected circuit type in Hertz (Hz).

Applications of Cutoff Frequency Calculation

The cutoff frequency determines how your RC or RL circuit filters signals. Engineers use it to:

• Design low-pass, high-pass, and band-pass filters.
• Analyze frequency response of circuits.
• Optimize signal attenuation and filtering for electronics projects.

With this tool, you can quickly and accurately calculate the cutoff frequency, improving your circuit design and analysis efficiency.