RC Filter Calculator
Free calculate cutoff frequency for low-pass and high-pass rc filters from resistor and capacitor values.
Input Parameters
Results
Enter R and C to calculate cutoff frequency
RC Filter Formula
Cutoff Frequency
f_c = 1 / (2π × R × C)
Where:
- • f_c = cutoff frequency (Hz)
- • R = resistance (Ω)
- • C = capacitance (F)
- • -3 dB point (70.7% of input)
Low-Pass Filter
Passes frequencies below f_c
Attenuates frequencies above f_c
High-Pass Filter
Passes frequencies above f_c
Attenuates frequencies below f_c