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RLC Circuit Calculator

Choose a series or parallel RLC model, enter component values, and inspect resonance plus impedance at a frequency you choose.

Ideal lumped, linear RLC model only. Parallel mode means R, L and C are all in parallel. It ignores tolerances, parasitics, coil resistance, source impedance, nonlinear parts, load coupling and safety. It does not certify a real circuit or select parts. Check datasheets and consult a qualified professional before building or using real hardware. Runs locally; no upload.

How do you calculate RLC resonance?

For ideal lumped components, resonant frequency is 1/(2π√(LC)). Quality factor and bandwidth depend on whether the resistor is in series or parallel. This calculator also evaluates complex impedance at your selected frequency.

Frequently asked questions

How do you calculate RLC resonance?

For ideal lumped components, resonant frequency is 1/(2π√(LC)). Quality factor and bandwidth depend on whether the resistor is in series or parallel. This calculator also evaluates complex impedance at your selected frequency.

Are my circuit values uploaded?

No. The math and response curve run in this browser; your entered values are not uploaded or saved.

What is the resonant frequency formula?

For an ideal inductor L and capacitor C, f₀ = 1/(2π√(LC)). Use henries and farads to obtain hertz. The resistor changes damping and Q, not this ideal LC resonance formula.

How do series and parallel RLC circuits differ?

At resonance, an ideal series RLC has minimum impedance equal to R; an ideal parallel RLC has maximum impedance equal to R. Current and voltage behavior therefore differ even though ideal f₀ is the same.

How are Q and bandwidth calculated?

For the series model, Q = ω₀L/R and bandwidth is R/(2πL). For the parallel model, Q = R/(ω₀L) and bandwidth is 1/(2πRC). These are ideal single-resonance relationships.

Does this model include real component tolerances?

No. It assumes ideal, linear, lumped R, L and C components. Parasitics, inductor winding resistance, source impedance, loading and component variation can shift or damp real circuits.

Can this calculator certify a circuit as safe?

No. It is an educational estimate, not a design approval or safety assessment. Confirm component ratings and real-world behavior with datasheets and qualified engineering review.