Use this online calculator to compute the reactance of a capacitor in Ω at a specific frequency given its capacitance.

Also see Inductive reactance online calculator & Python code

*TechOverflow calculators:*

You can enter values with SI suffixes like

**12.2m**(equivalent to 0.012) or

**14k**(14000) or

**32u**(0.000032).

The results are calculated

*while you type*and shown directly below the calculator, so there is no need to press

*return*or click on a

*Calculate*button. Just make sure that all inputs are

**green**by entering valid values.

#### Formula:

X_C = \frac{1}{2\pi fC}#### Python code:

The preferred way is to use UliEngineering’s `UliEngineering.Electronics.Reactance.capacitive_reactance`

:

from UliEngineering.Electronics.Reactance import * # You can either pass strings like "150 pF" or values like 150e-12 capacitive_reactance("150 pF", "10 MHz") # returns 106.1032953945969

Or get a human-readable value:

from UliEngineering.Electronics.Reactance import * from UliEngineering.EngineerIO import * # Compute value as a string xc = auto_format(capacitive_reactance, "150 pF", "10 MHz") # "106 Ω" # ... or print directly auto_print(capacitive_reactance, "150 pF", "10 MHz") # prints "106 Ω"

In case you can’t use *UliEngineering* and you want to do it manually, here’s a minimal example:

import math def capacitive_reactance(f, c): """Compute the capacitive reactance""" return 1./(2*math.pi*f*c)