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This is a simple tool to calculate trace impedance on multi-layer PCBs and generate output files for inclusion into layout design documents. This tool can handle board stack ups to 16 copper layers, metric or English dimensioning, multiple ground planes and differential impedance calculations. The tools I can find on the Web either don't do exactly what I want, cost money or are part of a layout package I don't have access to.
Just down load the attachment and install it. It will retrieve dotNet4 Client if your system needs it. I've only tested it with Win7/64 but should work fine with XP or Win7/32.
This is a complimentary tool with no guarantees of accuracy.