Calculadora de Filtro RC

Ingresa valores de resistencia y capacitancia para calcular la frecuencia de corte, constante de tiempo y respuesta en frecuencia. Incluye diagrama de Bode SVG interactivo y referencia de valores estándar E24.

R & C Values

Resistance (R)

Capacitance (C)

Time Constant Result

τ = R × C

1 ms

Multiple	Time	Charge %	Discharge %
1τ	1 ms	63.21%	36.79%
2τ	2 ms	86.47%	13.53%
3τ	3 ms	95.02%	4.98%
4τ	4 ms	98.17%	1.83%
5τ	5 ms	99.33%	0.67%

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What is an RC Filter Calculator?

An RC Filter Calculator computes key parameters for resistor-capacitor circuits: the time constant (τ = R×C), charge/discharge voltage curves, and filter cutoff frequencies. RC circuits are fundamental building blocks in electronics — used for signal filtering, timing, coupling, and power supply decoupling. The cutoff frequency fc = 1/(2πRC) defines where a filter begins attenuating signals.

How to Use the RC Filter Calculator

Enter resistance (R) and capacitance (C) values with unit selectors or use preset buttons
Time Constant tab: view τ and the 1τ–5τ charge/discharge percentage table
Charge/Discharge tab: set Vin, time, and mode to see V(t), I(t) with an exponential curve chart
Low-Pass or High-Pass tab: view cutoff frequency (fc) and enter a test frequency for gain/phase
All tabs feature interactive SVG charts that update in real-time

Frequently Asked Questions

What is the RC time constant (τ)?

The time constant τ = R × C is the time it takes for a capacitor to charge to 63.2% of the supply voltage (or discharge to 36.8%). After 5τ, the capacitor is considered fully charged (99.3%).

How is the cutoff frequency calculated?

The cutoff frequency is fc = 1 / (2π × R × C). At this frequency, the filter output is -3 dB (about 70.7%) of the input. For a low-pass filter, frequencies below fc pass through; for a high-pass filter, frequencies above fc pass through.

What is the difference between a low-pass and high-pass RC filter?

In a low-pass filter, the output is taken across the capacitor — it passes low frequencies and attenuates high frequencies. In a high-pass filter, the output is taken across the resistor — it passes high frequencies and attenuates low frequencies. Both have a -20 dB/decade roll-off.

What is a Bode plot?

A Bode plot shows how a filter's gain (in dB) and phase change with frequency on a logarithmic scale. It's the standard way to visualize filter frequency response. The -3 dB point marks the cutoff frequency where output power drops to half.