How to Use Cable Impedance Calculator
Enter the cable resistance in ohms, inductance in henries, and signal frequency in hertz. The calculator computes inductive reactance first, then combines resistance and reactance as perpendicular components of impedance. Use non-negative values; increasing frequency or inductance raises the inductive part of the result.
Formula & Theory - Cable Impedance Calculator
For this simplified cable model, impedance has a resistive part R and an inductive reactance part XL. Inductive reactance grows with frequency and inductance. The displayed impedance is the magnitude of the complex quantity R + jXL, not a full transmission-line characteristic impedance model.
X_L = 2 * pi * f * L
|Z| = sqrt(R^2 + X_L^2)Use Cases for Cable Impedance Calculator
Use it for quick AC wiring estimates, speaker or signal cable comparisons, electronics homework, and sanity checks where resistance and inductance dominate. For high-speed RF lines, controlled-impedance PCB traces, or long transmission lines, use a dedicated transmission-line calculator instead.