Low Pass Filter Calculator

Low pass filter calculator is an easy-to-use tool to quickly determine the cutoff frequency of a low pass passive filter. A low pass filter removes higher-frequency components from a given AC signal.

This calculator allows you to choose filter circuit: RC filter or RL filter.

RC low pass passive filter

The RC low pass passive filter consists of a resistor and a capacitor.

Cutoff frequency formula: f_c = 1 / 2πRC

To calculate a particular parameter of a circuit (e.g. cutoff frequency (f_c), resistance (R) value or capacitance (C) value) click on the corresponding parameter on the figure and then enter all the necessary values:

• If you specify resistance (R) value and capacitance (C) value the cutoff frequency will be calculated;
• If you specify cutoff frequency (f_c) value and capacitance (C) value the resistance (R) value will be calculated;
• If you specify cutoff frequency (f_c) value and resistance (R) value the capacitance (C) value will be calculated.

RL low pass passive filter

The RL low pass passive filter consists of a resistor and a inductor.

Cutoff frequency formula: f_c = R / 2πL

To calculate a particular parameter of a circuit (e.g. cutoff frequency (f_c), resistance (R) value or inductance (L) value) click on the corresponding parameter on the figure and then enter all the necessary values:

• If you specify resistance (R) value and inductance (L) value the cutoff frequency will be calculated;
• If you specify cutoff frequency (f_c) value and inductance (L) value the resistance (R) value will be calculated;
• If you specify cutoff frequency (f_c) value and resistance (R) value the inductance (L) value will be calculated.