PCB Trace Impedance CalculatorCalculates the characteristic impedance and perunitlength parameters of typical printed circuit board trace geometries.

Select a configuration:

Geometric Parameter Definitions
Electrical Parameter Definitions
Acknowledgements:
The source for formulas used in this calculator (except where otherwise noted) is:
THESE FORMULAS ARE APPROXIMATIONS! The transmission line calculator concept was developed by Douglas Brooks and is described in his paper: PCB Impedance Control: Formulas and Resources, Printed Circuit Design Magazine, March 1998. A copy of his paper and a similar transmission line calculator that runs on a PC can be obtained from UltraCAD Design, Inc. 