Enter the individual impedances of up to 5 different components to determine the equivalent impedance of those components in parallel. This calculator can also be used to calculate the impedance in series.

Parallel Impedance Formula

The following formula is used to calculate an equivalent impedance of components in parallel.

I = 1 / [ (1/i1) + (1/i2) + (1/i3) + (1/i4) + (1/i5) ]

  • Where I is the equivalent parallel impedance (ohms)
  • i1 – i5 are the individual impedances of the components (ohms)

Parallel Impedance Definition

What is a parallel impedance? A parallel impedance is a measure of the equivalent impedance of a circuit whose components are assembled in parallel. In parallel circuits, the voltage is the same across every component.

Example Problem

How to calculate parallel impedance?

  1. First, determine the individual impedances.

    For this example, we have impedances of 5 components which equal; 10, 12, 20, 5, and 7 ohms respectively.

  2. Next, use the formula to calculate the equivalent impedance.

    Using the formula, we find the equivalent impedance to be: 1 / [ (1/10) + (1/12) + (1/20) + (1/5) + (1/7) ] = 1.735 ohms.

  3. Finally, use the equivalent impedance to solve your problem.

    You can now use this impedance as the impedance of the entire circuit.

About Parallel Impedance

How to add parallel impedances? To combine parallel impedances, you must use the same formula that is displayed above, but instead of using the individual impedances, you would use the two or more calculate parallel impedances.

parallel impedance calculator
parallel impedance formula