Active Filter Design Calculator

Design Sallen-Key low-pass and high-pass active filters with component values.

Desired -3dB cutoff frequency.
Hz
Filter Q factor (0.707 for Butterworth).
Choose a standard capacitor value in nF.
nF

Results

Resistor R1-kΩ
Resistor R2-kΩ
Passband Gain-V/V
References: Texas Instruments Active Filter Design Techniques; Sallen & Key (1955)