PCB Impedance Calculator

Calculate microstrip and stripline characteristic impedance for high-speed PCB design.

Input Parameters

Transmission Line Type

Dielectric Constant (εᵣ)

(FR-4 ≈ 4.4)

Dielectric Height (h) [mm]

Trace Width (w) [mm]

Trace Thickness (t) [mm]

(1 oz ≈ 0.035mm)

Formula Info:

Uses IPC-2141 standard approximations. These formulas are generally accurate when:

0.1 < w/h < 3.0
1 < εᵣ < 15

Characteristic Impedance

Impedance (Z₀)

111.56 Ω

Design Context

Standard high-speed designs usually target 50Ω for single-ended signals and 100Ω for differential pairs. Adjust width or height to match your target impedance.

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