pcbplanner is PCB design software that runs entirely in your browser: 36 calculators covering impedance, stackups, trace loss, crosstalk, vias, thermal design, power integrity and the rest of the numbers a board needs settled before it goes to fabrication.
The impedance, crosstalk, differential-via and trace-loss tools solve the actual cross-section with a 2D electrostatic field solver, rather than closed-form approximations that assume a shape your board does not have. Every prepreg and core ply keeps its own Dk, solder mask and trapezoidal etching are modelled, and conductor loss comes from the incremental-inductance rule with a copper-roughness model on top. The stackup advisor uses the same solver to design every trace on 178 fabricator stackups and rank the ones that meet your requirements.
Each tool documents its method under Method, formulas and references, including the equations it uses and their limits. Where a number comes from a table rather than a formula, the table names its source.
Laminate Dk and Df are taken from manufacturer datasheets — Isola, Panasonic, Rogers, Shengyi, Nan Ya, TUC and others — with the measurement method and frequency recorded alongside each value. The rule-based tools follow published standards: IPC-2221 and IPC-2152 for conductor spacing and trace width, IPC-7251 and IPC-7351 for land patterns, IEC 60664-1 for creepage and clearance, JEDEC for memory, and the PCI-SIG, USB-IF, SATA-IO and chip-vendor documents behind the interface routing rules. Nothing here is a number someone remembered.
There is no account, no server-side calculation and no database. Every tool keeps its inputs in the page address, so any result is a link you can share or bookmark. Projects and custom stackups are stored in your browser and can be exported to a file you keep. The site carries no analytics and no tracking scripts.
The solvers and data tables are covered by more than 350 automated checks, including comparisons against published reference results. That makes the tools reliable for design work, but they remain models: confirm controlled-impedance geometry with your fabricator, who adjusts widths to their own process, and treat clearance, creepage and thermal results as design guidance rather than a substitute for qualification and compliance testing.