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 Calculate Inductive and Capacitive Reactance


Inductive Reactance




The impedance of an air wound coil is given by the following formula:

Xl = 2 * pi * f * L

Where Xl is the inductive reactance in ohms, f is the frequency in hertz and L the inductance of the coil in Henrys.
An inductor wound on an iron or ferrite core will have a different value.
 
Calculate inductive reactance
 
Frequency in Hz: Hz kHz MHz
Inductivity in Henry H mH nH
Inductive Reactance  Ohms
Inductive Reactance  kOhms
Inductive Reactance  MOhms
 
Calculate required Inductor for producing a inductive reactance
 
Frequency: Hz kHz MHz
Inductive reactance Ohms kOhms MOhms
Value of Inductor =  H
Value of Inductor =  mH
Value of Inductor =  nH
 
Calculate Impedance of a Parallel RL Circuit
 
Frequency: Hz kHz MHz
Inductor: H mH nH
Resistant: Ohms kOhms MOhms
inductive reactance Xl =  Ohms
Total impedance Z =  Ohms
 
Calculate Impedance of a Series RL Circuit
 
Frequency: Hz kHz MHz
Inductor: H mH nH
Resistant: Ohms kOhms MOhms
inductive reactance Xl =  Ohms
Total impedance Z =  Ohms
 
Calculate Q of an Inductor
 
Frequency: Hz kHz MHz
Internal resistance of the inductor Ohms kOhms MOhms
Inductor H mH
Q of inductor =
 


 

Capacitive Reactance




Xc = 1 / (2 * pi * f * C)

This is similar to the inductor, with C in farads and f in hertz. The capacitive reactance will be in ohms.
 
 
Calculate capacitive reactance
 
Frequency in Hz: Hz  kHz  MHz
Capacity uF  nF  pF 
Capacitive Reactance  Ohms  
Capacitive Reactance  kOhms  
Capacitive Reactance  MOhms  
 
Calculate required Capacitor for producing a capacitive reactance
 
Frequency: Hz kHz MHz
Capacitive reactance Ohms kOhms MOhms
Value of capacitance =  uF
 
Calculate total impedance of a Parallel RC circuit
 
Frequency: Hz kHz MHz
Capacity: F uF nF pF
Resistant: Ohms kOhms MOhms
capacitive reactance Xc =  Ohms
Total impedance Z =  Ohms
 
Calculate total impedance of a Series RC circuit
 
Frequency: Hz kHz MHz
Capacity: F uF nF pF
Resistant: Ohms kOhms MOhms
capacitive reactance Xc =  Ohms
Total impedance Z =  Ohms
 
 
Calculate required inductance & capacitance
 
Desired frequency: Hz Hz  kHz  MHz 
Desired reactance: Ohms
Required inductance, L = H
Required inductance, L = mH
Required inductance, L = nH
Required capacitance, C = µf
Required capacitance, C = nf
Required capacitance, C = pf
 
 
Calculate the resonant frequency of a capacitor and inductor
 
Inductor : mH  nH 
Capacitor: uF  nF  pF 
Fres  Hz  
Fres  kHz  
Fres  MHz