PCB Impedance Calculator

Stackup configuration

Define your PCB layer structure and copper weights

Trace width

—

mil

Actual impedance

—

Propagation delay

—

ps / in

Effective Dk

—

Eeff

Stackup total

—

mil

Global parameters

Layers

PCB thickness (mm)

Inner copper

Outer copper

Surface finish

Unit

Thickness tolerance

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

Drill diameter (mil)

Pad diameter (mil)

Antipad diameter (mil)

Via height (mil)

Dielectric Dk

Via type

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.

Calculate microstrip, stripline, and differential pair impedance for high-speed PCB designs. Adjust trace width, dielectric thickness, copper thickness, and material properties to achieve accurate controlled impedance and improve signal integrity.