RC Filter Calculator
f_c = 1 / (2πRC)
Instructions
Choose low-pass or high-pass, enter R (ohms) and C (farads). Click Calculate to get the -3 dB cutoff frequency.
Formula
f_c = 1 / (2πRC)
Common Questions
What about load impedance?
Real circuits interact with source/load impedances, shifting the cutoff slightly from the ideal value.