Filter Calculators

This page contains a variety of calculators as an aid in learning about and designing with filter circuits.

It contains a variety of calculators for low pass, high pass, and bass pass filters.

Low Pass Filter Calculators

Main Page: Low Pass Filter Calculators

A low pass filter blocks frequencies above its cut-off frequency.

A low pass filter is designed to remove high frequencies from a complex input signal, leaving frequencies below the cut-off frequency of the filter fc.

High Pass Filter Calculators

Main Page: High Pass Filter Calculators

A high pass filter blocks frequencies below its cut-off frequency.

High pass filters remove high low from the input signal, leaving frequencies above the cut-off frequency of the filter.

Band Pass Filter Calculators

Main Page: Band Pass Filter Calculators

The band pass filter allows only frequencies in the passband to pass to the output.

A band pass filter is designed to remove frequencies above and below a selected band called the passband. It can be thought of as a combination of a high and low pass filter that allows only select mid-range frequencies to pass.

Band pass filters have two characteristic frequencies; fL represents the low frequency cut-off and fH is the high frequency cut-off. The passband is between fL and fH.