Capacitive Reactance Calculator

If you want to find the electrical resistance produced by a capacitor in an AC circuit, you can use our capacitive reactance calculator.

In physics, a complicated capacitor's impedance where the amount of current changed concerning the applied frequency is known as capacitive reactance. Whereas, reactance is the current's flow opposition in the circuit element that occurred due to capacitance/inductance. The SI unit used to measure capacitive reactance is ohms (same as resistance). The value of capacitive reactance relies on the applied voltage frequency of the capacitor's value. X is used to symbolize reactance.


Formula of Capacitive Reactance Calculator

To know how to calculate capacitive reactance manually, you can use the formula listed below:

Xc = 1/(2πfC)


C = Capacitance

f = Frequency

2π = 6.283


To know more about it, you can use our Capacitive Reactance Definition.


For a more transparent and precise understanding of a concept and to comprehend how to find capacitive reactance, let us solve an example below:

Suppose a circuit has a capacitor of 220nF, supplying a current at the frequency of is 20kHz, then determine the capacitive reactance value of a capacitor.

Given data

Capacitance = C = 220nF = 220 × 10-9 F
Frequency = f = 20 kHz = 20 × 103 Hz

To Find

Capacitive reactance = ?


To find out the capacitive reactance of a capacitor, we will use the formula listed below:

Xc = 1/(2πfC)

Putting values in the formula:

Xc = 1 / (6.283) × (20×103 Hz) × (220×10-9 F)
Xc = 723.4 Ω

How to use the Capacitive Reactance Calculator?

The steps to use the capacitive reactance calculator are as follows:

Step 1: Enter the value of capacitance in the first required input.

Step 2: Enter the value of the frequency in the second required input.

Step 3: The calculator will automatically display an answer on the screen.

Calculator use

You can use our capacitive reactance calculator in various principles of circuits, such as; making AC filter circuits and DC power supply (to decrease the consequences of undesired ripple voltage).