# Microstrip Impedance Calculator - Electrical Engineering

Use this electrical engineering calculator to calculate the Characteristic Impedance, Capacitance per unit length, Inductance per unit length and DC resistance per unit length and propogation speed given the trace width, thickness, dielectric thickness and relative dielectric constant.

Note:
1. Increase in trace width (W) decreases Single Ended Impedance (Zo).
2. Increase in dielectric thickness (H) increases Zo.
3. Increase in trace thickness (t) decreases Zo.

## Microstrip Impedance Calculator

mm
mils
mm
mm
mm
mm
Ohms
ps/unit len
nH/unit len
pF/unit len
pF/unit len

Use this electrical engineering calculator to calculate the Characteristic Impedance, Capacitance per unit length, Inductance per unit length and DC resistance per unit length and propogation speed given the trace width, thickness, dielectric thickness and relative dielectric constant.

Note:
1. Increase in trace width (W) decreases Single Ended Impedance (Zo).
2. Increase in dielectric thickness (H) increases Zo.
3. Increase in trace thickness (t) decreases Zo.

Code to add this calci to your website  #### Formula: Microstrip Impedance Zo = ( 87 / (√(er+1.41)) ) * In( (5.98*h)/( (0.8*w)+t ) ) Tpd = 3.333 * (√((0.475*er)+0.67)) * dimension; C = Tpd / Zo; L = Tpd * Zo / 1000; Dc = (17.2 / (w * t * dimension2)) / 1000;

Where, Zo = Single Ended Impedance er = Relative dielectric constant h = Trace width w = Trace height t = Trace thickness Tpd = Propagation Delay C = Capacitance L = Inductance Dc = Resistance if dimension unit is mm then dimension=1 if dimension unit is mils then dimension is 0.0254