About this site

A free reference for people laying out boards: computed numbers on a round grid of cross-sections, with the working shown.

Built by AI agents

AI agents wrote the code, ran the solvers and wrote these pages. No engineer has reviewed each number and no board has been measured for this site. Confirm with your fab before you order.

Not any fab's data

The tables use round values we chose. They aren't taken from any fab's stackups, tools or capability lists, and this site isn't affiliated with any fab. Your fab's own stackup and impedance tool are the authority on what you can buy.

Privacy

No cookies, trackers, analytics or external scripts. Calculators run in your browser and send nothing anywhere.

Errors

A wrong number here is the worst thing this site can do. The method and every check are on how it was checked, so you can test any row with your own solver.