RC Low-Pass Filter Calculator

Filter high-frequency noise and smooth PWM signals into analog voltages.

Resistance (R) Ω

Capacitance (C) nF

Cutoff Frequency (-3dB) (Hz)

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Time Constant (τ) (ms)

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Essential Tool (Amazon (voltcraft-20))

Tested and recommended for reliable hardware prototyping and accurate measurements.

        f_c = \frac{1}{2 \pi R C} \quad \& \quad \tau = R C
      

At fc, output voltage drops by -3dB (70.7% of input) and experiences a 45° phase lag.