Impedance Calculator

Enter the angular frequency in rad/s, the normal frequency in Hz, and the capacitance in farads to calculate the impedance of a capacitor.

Impedance Formula

The following formula can be used to calculate the impedance of a capacitor.


  • Where XC is reactance, which can be considered impedance
  • ω is the angular frequency in rad/s
  • f is the normal frequency in Hz
  • C is the capacitance in farads

As can be seen from the formula above, the impedance of a capacitor can be calculated using either the normal frequency or the angular frequency.

What is impedance?

Impedance is the effective resistance of a circuit or component to alternation current. This resistance arises from the effects of both ohmic resistance and reactance.

In an ideal resistor, the resistance of the resistor is exactly equal to the impedance. In an ideal capacitor, the impedance is is equal to the magnitude of the reactance. It should be noted that impedance is represented by an expression of a real and imaginary component, while reactance is an ordinary number. In the case of an ideal capacitor however, we are assuming the imaginary part of this expression to be 0, and so we can represent the impedance using the formula above.

How to calculate impedance

The following example is a step by step guide on how to calculate the impedance of and IDEAL capacitor.

  1. First, you must determine whether to use the angular frequency of the circuit of the normal frequency of the circuit. For this example we will use the normal frequency and say it had a value of 200 Hz.
  2. The next step is to determine the capacitance of the circuit and or capacitor. For the example we will assume that the capacitance is equal to 200 Farads.
  3. Finally, enter the information into the formula. 1 / 2 * pi * 200 * 200 = .00000398.
  4. Analyze the results and apply whats been learned.
impedance calculator

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