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Microstrip Transmission Line Calculator
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The characteristic impedance (Zo) of a microstrip transmission line can be calculated with the active calculator.

[diagram of PCB layers]

Relative Dielectric Constant

 εr :

Width of track

 W : mm

Thickness of track (1 oz/ft2 = 0.035 mm)

 t : mm

Thickness of dielectric

 h : or b : mm

Space between traces

 s : mm


Formula by
IPC

Effective Width

 Weff : mm

Characteristic Impedance

 Zo : Ohms

Differential Impedance

 Zdiff : Ohms

Propagation Delay

 Tp : ns/mm

Propagation Speed

 Vp : mm/ns


This calculator uses JavaScript