calc.engineer / PCB & Electronics / RC Filter

RC Filter v1.0.0

Computes the cutoff frequency, time constant, impedance, and phase shift of a first-order RC filter. Supports both lowpass and highpass topologies. The cutoff frequency is f = 1/(2*pi*R*C) where the signal is attenuated by 3 dB. The time constant tau = R*C governs transient response — the capacitor reaches 63.2% of its final value after one tau. Use for anti-aliasing before ADCs, DC blocking, noise filtering, and signal conditioning. Chain from voltage_divider to design filtered bias networks.

← from voltage_dividerfeeds lc_resonance →
Resistance in ohms (R). The resistive element of the RC filter.
Capacitance in farads (C). The capacitive element of the RC filter.
Filter topology: 'lowpass' (R then C to ground) or 'highpass' (C then R to ground).
Fill in the inputs and Compute to see the structured result.

From an agent (MCP) or the API

curl -X POST https://calc.engineer/api/rc_filter \
  -H "Content-Type: application/json" \
  -d '{"resistance_ohm": …, "capacitance_f": …, "filter_type": …}'

MCP: connect to https://calc.engineer/mcp and call rc_filter.

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