circuits

RC, RL and RLC Calculator

Analyze series RC, RL, and RLC circuits with complex impedance, phase, RMS current and component voltages, time constants or resonance metrics, analytic -3 dB cutoffs, and a logarithmic frequency sweep.

Calculator

Formula

τRC = RC; τRL = L/R; f₀ = 1/(2π√LC)

Assumptions and limits

RLC quality factor uses the ideal series-RLC model with positive component values.

Example

A ready-to-load example

The calculator starts with an editable example.

Sources

University Physics Volume 2 — OpenStax

Frequently asked questions

Are my inputs uploaded?

No. This calculator runs locally in your browser. Inputs are placed in a URL only when you explicitly copy a share link.

Why are units converted first?

Canonical units prevent scale errors when inputs use mixed units. The result is converted back to your selected output unit afterward.

Does the result replace professional judgment?

No. The result applies only to the stated model and assumptions. Qualified people should review high-risk engineering, medical, or laboratory decisions.