# Circuit Board Trace Impedance Calculator

Calculates the characteristic impedance and per-unit-length parameters of typical printed circuit board trace
geometries.

### Select a Configuration

### Source of Impedance Equations

The source for formulas used in this calculator (except where otherwise noted) is
the *Design Guide for Electronic Packaging Utilizing High-Speed Techniques* (4th Working
Draft, IPC-2251, February 2001.

THESE FORMULAS ARE APPROXIMATIONS! They should not be used when a high degree of accuracy is required.

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