Analog · Filters

Filter Calculators

Filter Calculators computes passive and active filter component values — RC, LR, RLC, and op-amp designs — offline in your browser, with live Bode, Nyquist, impulse, and step response plots.

How it works

Pick a topology and enter component values or a target cutoff, and the calculator solves for the missing values and plots the response in real time. It covers first- and second-order passive filters plus active Butterworth, Chebyshev, and Bessel designs. All math runs locally in the browser, so it works without a connection and nothing is sent to a server.

FAQ

Is Filter Calculators free?

Yes. Filter Calculators is free to use in your browser, with no account required.

Does Filter Calculators work offline?

Yes. It is an offline-first tool that runs locally in your browser, so it keeps working without an internet connection.

Does Filter Calculators collect my data?

No. There are no accounts, no servers, and no tracking — your data stays on your device.