How to use this tool
Enter trace length and the effective relative permittivity of the routing geometry. The model treats propagation velocity as c divided by the square root of effective permittivity. A second field shows the delay corresponding to a length mismatch.
Interpret the result
Use the result to compare timing budgets, not to justify arbitrary length matching. Package delay, connectors, vias and receiver requirements may dominate. Equal physical lengths routed on different layers can have different electrical delays.
Method & assumptions · General design guidance. Validate the proposed construction and acceptance criteria for your project.