# Microstrip PCB Impedance

Easily calculate the impedance, capacitance, propagation delay, and inductance of a microstrip line PCB using our online calculator.

Calculate the impedance, capacitance, propagation delay, and inductance of a Microstrip Line PCB using this convenient online calculator. Understand the characteristics of your electrical transmission lines and optimize your circuit design.

Relative Permittivity
Height of Dielectric
mm
Width of Trace
mm
Trace Thickness
mm
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1 Number of calculations

z = \frac{{87}}{{\sqrt{{e + 1.41}}}} \cdot \ln\left(\frac{{5.98h}}{{0.8w + t}}\right)
c = \frac{{2.64 \times 10^{-11} \cdot (e + 1.41)}}{{\ln\left(\frac{{5.98h}}{{0.8w + t}}\right)}}
p = 3.34 \times 10^{-9} \cdot \sqrt{{0.475e + 0.67}}
l = c \cdot z^{2}

where,

• z = Characteristic Impedance
• e = Relative Permittivity
• h = Height of Dielectric
• w = Width of Trace
• t = Trace Thickness
• c = Capacitance per unit length
• p = Effective propagation delay
• l = Inductance per unit length