Enter your Inductance (L) and Frequency (f) — along with their respective units — into the Inductive Reactance Calculator, and it works out your circuit's Inductive Reactance (XL), plus bonus values for Inductive Admittance (BL) and Impedance Magnitude.
Inductive Reactance (XL)
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Inductive Admittance (BL)
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Impedance Magnitude
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Inductive reactance is the opposition that an inductor offers to alternating current (AC). It increases with frequency and inductance, and is measured in ohms (Ω).
Use the formula XL = 2πfL, where XL is inductive reactance in ohms, f is frequency in hertz, and L is inductance in henries. Our calculator handles unit conversions automatically.
In a DC circuit (frequency = 0), inductive reactance is zero. This means an inductor acts like a short circuit to DC current, offering no opposition.
Inductive reactance (XL = 2πfL) increases with frequency, while capacitive reactance (XC = 1/2πfC) decreases with frequency. They have opposite effects on AC circuits.
Rearrange the formula to L = XL/(2πf). If you know the reactance and frequency, divide the reactance by 2π times the frequency to find inductance.
The SI unit of inductive reactance is the ohm (Ω), which is the same unit used for electrical resistance and impedance.
As frequency increases, the inductor's opposition to current changes increases because the magnetic field changes more rapidly, inducing a larger back EMF that opposes current flow.
Inductive admittance (BL) is the reciprocal of inductive reactance, calculated as BL = 1/XL. It represents how easily AC current can flow through an inductor and is measured in siemens (S).