RLC Reactance & Resonance Calculator
RLC
RLC Reactance & Resonance Calculator
Inductive/capacitive reactance, impedance, resonant frequency & Q factor for a series RLC circuit
Inductor
Capacitor
Resistor (optional, for Z/Q)
At Resonance (f₀ = 1 / (2π√(LC)))
Resonant Frequency f₀
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Reactance at f₀ (XL = XC)
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Quality Factor Q = X₀ / R
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Bandwidth (−3dB) = f₀ / Q
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At a Specific Operating Frequency
Inductive Reactance XL = 2πfL
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Capacitive Reactance XC = 1/(2πfC)
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Net Reactance (XL − XC)
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Impedance |Z| = √(R² + (XL−XC)²)
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Note: below resonance XC dominates (net reactance is capacitive); above resonance XL dominates (inductive). At exactly f₀ the reactances cancel and impedance drops to just R — the classic series-resonance behavior.
