Enter the inductance and capacitance into the calculator to determine the impedance. This calculator can also evaluate any of the variables given the others are known.

- Differential Pair Impedance Calculator
- Microstrip Differential Impedance Calculator
- Stripline Impedance Calculator

## Via Impedance Formula

The following formula is used to calculate the impedance in a via.

Z = sqrt((L / C))

Variables:

- Z is the impedance (Ohms) L is the inductance (Henries) C is the capacitance (Farads)

To calculate the impedance in a via, divide the inductance by the capacitance, then take the square root of the result.

## What is a Via Impedance?

Via impedance is a measure of the opposition to the flow of electric current through a via, which is a hole in a printed circuit board (PCB) that allows electrical connection between different layers of the board. It is a critical parameter in high-speed digital and high-frequency analog circuits, as it can affect signal integrity, power integrity, and electromagnetic compatibility. The impedance of a via is determined by its physical dimensions, the dielectric constant of the PCB material, and the frequency of the signal passing through it.

## How to Calculate Via Impedance?

The following steps outline how to calculate the Via Impedance using the formula: Z = sqrt((L / C)).

- First, determine the value of inductance (L) in Henries.
- Next, determine the value of capacitance (C) in Farads.
- Next, substitute the values of L and C into the formula Z = sqrt((L / C)).
- Finally, calculate the Via Impedance (Z) using the formula.
- After inserting the values and calculating the result, check your answer with the calculator above.

**Example Problem:**

Use the following variables as an example problem to test your knowledge.

Inductance (L) = 5 Henries

Capacitance (C) = 10 Farads