🎥 Filter Calculator
Calculate cutoff frequencies, component values, and visualize the frequency response of passive RC, RL, and LC filters.
RC Low-Pass Filter
fc = 1 / (2πRC) -20 dB/decade rolloff
Solve for component given fc:
Gain (dB)
Phase (degrees)
RC High-Pass Filter
fc = 1 / (2πRC) +20 dB/decade below fc
Solve for component given fc:
Gain (dB)
Phase (degrees)
RC Band-Pass Filter (Two-Stage)
flow = 1/(2πR1C1) fhigh = 1/(2πR2C2)
A band-pass is formed by cascading a high-pass (sets lower cutoff) and a low-pass (sets upper cutoff).
Combined gain (dB)
LC Resonant Filter
fr = 1 / (2π√(LC)) Q = (1/R)√(L/C)
Ω
Impedance magnitude