Free tool

RC/RL Filter Bandwidth Calculator

Select the filter type, enter resistance and capacitance or inductance, and get the theoretical cutoff frequency or bandwidth from a clearer interface.

Tools

Calculate cutoff frequency and bandwidth for RC and RL filters

The calculator helps you estimate the basic behaviour of low-pass, high-pass, band-pass and band-stop filters in both RC and RL topologies.

Choose the filter family and work with the right component pair to obtain the associated theoretical frequency.

Introduce una resistencia, un componente reactivo y una combinacion de unidades coherente con el filtro seleccionado.

Result--The cutoff frequency or theoretical bandwidth will be shown according to the selected topology.

What the calculator interprets

The tool uses basic first-order relations to provide a quick reference before you move on to simulation or real testing.

For RC filters

Usa una resistencia y una capacidad.
Frecuencia caracteristica: f = 1 / (2 x pi x R x C)

For RL filters

Usa una resistencia y una inductancia.
Frecuencia caracteristica: f = R / (2 x pi x L)

Quick guide

How to use a theoretical cutoff frequency without losing context

This calculator gives you a very useful first-order reference for starting to size a filter. In a real circuit, tolerances, loading, parasitics and the frequency behaviour of the rest of the system also matter.

Lectura rapida

RC: combina resistencia y capacidad para fijar la frecuencia caracteristica.
RL: combina resistencia e inductancia con la misma idea de filtrado basico.
Paso alto y paso bajo suelen expresarse como frecuencia de corte.
Pasa banda y elimina banda se presentan aqui como referencia de ancho de banda.

RC filter

First-order reference for topologies that use a resistor and a capacitor.

f = 1 / (2 x pi x R x C)

RL filter

Equivalent reference for topologies that use a resistor and an inductor.

f = R / (2 x pi x L)

More tools

More useful electronics calculators

If you are reviewing components or sizing a circuit, here are other related tools so you can keep working without leaving the RobotUNO environment.

Resistor calculatorIdentify color bands and calculate series or parallel equivalents. Ohm's law calculatorCalculate voltage, current and resistance in one place. Voltage divider calculatorGet the output voltage when sizing resistors in series. Current divider calculatorCheck how current splits across parallel branches. Series and parallel capacitor calculatorCalculate equivalent capacitance with a clearer interface. Op-amp gain calculatorSize the feedback network for inverting and non-inverting configurations. 555 timer calculatorCalculate charge and discharge times for NE555 designs. RC/RL filter bandwidth calculatorCheck cutoff frequency or bandwidth for the selected filter.

FAQ

Frequently asked questions

A short reference for the usual questions when calculating cutoff frequency or bandwidth in simple RC and RL filters.

Which topologies does this tool cover?

It includes low-pass, high-pass, band-pass and band-stop RC and RL filters in a first-order approximation.

What does the result return?

It returns a cutoff frequency for low-pass and high-pass filters, and a bandwidth reference for band-pass and band-stop filters.

Can I freely mix capacitance and inductance units?

The calculator accepts multiple scales, but make sure that an RC filter uses capacitance and an RL filter uses inductance.

Is the calculator free?

Yes. You can use it online without registration.

Next step

Need help with the electronic design of your project?

If you are developing a product and need support with electronics, PCBs, firmware or technical validation, we can review your case and point you in the right direction.

Go to contact View services