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Cable Impedance Calculator — Characteristic Impedance

Calculate characteristic impedance of audio cables from cable parameters.

Check cable manufacturer spec sheet

Typically 50-150 pF/m for audio cables

How We Calculate This

Characteristic Impedance

Z0 = √(L / C)

where L is inductance per metre (H/m) and C is capacitance per metre (F/m).

Propagation Delay

Delay = √(L × C) in seconds per metre

Velocity Factor

The signal speed as a percentage of the speed of light. Most cables have a velocity factor of 60-80%.

Frequently Asked Questions

Last updated: February 2026

All calculations are estimates based on standard formulas. Always verify results for critical applications.