Low-pass filter
A low-pass filter removes all frequencies above the cutoff frequency. This frequency is determined by the values of the components.
RC
![RC Low-pass filter](/media/rc-lpf-circuit.png)
Formulas
![](/shared/media/generated/84f0ec21946b.png)
![](/shared/media/generated/7e10ff33c2ff.png)
![](/shared/media/generated/eff9f69e3b74.png)
R is the symbol for resistance and is measured in ohm (Ω).
C is the symbol for capacitance and is measured in farad (F).
f c is the symbol for cutoff frequency and is measured in hertz (Hz).
Calculator
RL
![RL Low-pass filter](/media/rl-lpf-circuit.png)
Formulas
![](/shared/media/generated/1405a5f43e64.png)
![](/shared/media/generated/cffaba69a9fa.png)
![](/shared/media/generated/7f4fdae786af.png)
R is the symbol for resistance and is measured in ohm (Ω).
L is the symbol for inductance and is measured in henry (H).
f c is the symbol for cutoff frequency and is measured in hertz (Hz).
Calculator
RLC
![RLC Low-pass filter](/media/rlc-lpf-circuit.png)
Formulas
![](/shared/media/generated/77526cf9b207.png)
![](/shared/media/generated/4ea3f01c8bb5.png)
![](/shared/media/generated/2ea776df02a6.png)
C is the symbol for capacitance and is measured in farad (F).
L is the symbol for inductance and is measured in henry (H).
f c is the symbol for cutoff frequency and is measured in hertz (Hz).