PCB impedance calculator

A controlled impedance calculator for PCB designers. Configure your stackup, set target impedance values, and instantly get trace widths, tolerance ranges, DFM checks, and via parasitics — all based on IPC-2141A and Wadell formulas.

IPC-2141A Up to 24 layers DFM check
Setup
Stackup config
Impedance rows
Results
Dashboard
Tolerance
DFM check
Layer detail
Tools
Via estimator
IPC-2141A · Wadell formulas
Differential: Bogatin model
Stackup configuration
Define your PCB layer structure and copper weights
Trace width
—
mil
Actual impedance
—
Ω
Propagation delay
—
ps / in
Effective Dk
—
Eeff
Stackup total
—
mil
Global parameters
Layer stack editor
Click cells to edit thickness and Dk directly
Layer Material / description Thickness (mil) Dk (Er) Type
Calculation mode
Quick add:
Impedance results
Click Calculate to see results
Tolerance analysis
Run Calculate first
DFM check
Run Calculate first
Layer detail
Run Calculate first
Via impedance estimator

Coaxial approximation model (IPC-2141A). Parasitic C and L based on drill / pad / antipad geometry. Stub resonance from total via height. Verify with 3D EM simulation for designs above 5 GHz.