The RLC Impedance Calculator returns the magnitude |Z| and the phase angle φ of the impedance presented by a series or parallel RLC branch at a given frequency.
How to Use RLC Impedance Calculator
- Choose series or parallel — the topology defines how the reactances combine.
- Enter R, L, C and frequency — all four parameters are required.
- Read |Z| and phase — the calculator also classifies the circuit as inductive, capacitive or near-resonant.
- Check XL and XC — both reactances are listed so you can verify the dominant element.
Formula & Theory — RLC Impedance Calculator
XL = 2π f L, XC = 1 / (2π f C)
Series: Z = R + j(XL − XC), |Z| = sqrt(R² + (XL − XC)²)
φ = atan2(XL − XC, R)Use Cases for RLC Impedance Calculator
- Impedance matching — design networks at a specific working frequency.
- Power-factor analysis — quantify how reactive the load looks to the source.
- Filter tuning — confirm |Z| and φ at corner frequencies.
- Education — visualize the complex impedance triangle directly.