Inductance Calculator

Reactance at frequency, and where L and C cancel.

Written and maintained by Mohit PatelLast checked August 4, 2026How we build these

Inductance

Frequency

Capacitance

µF

Optional — gives the resonant frequency.

Inductive reactance (Ω)

6.2832

Resonance at 5,032.92 Hz

Inductive reactance (XL)6.28319 Ω

Capacitive reactance (XC)159.15494 Ω

Net reactance152.87176 Ω

Resonant frequency5,032.921 Hz

At twice the frequency12.5664 Ω

XL = 2πfL, so an inductor's opposition rises with frequency — it passes DC freely and blocks high frequencies. A capacitor does exactly the opposite, with XC = 1/(2πfC). Where the two are equal they cancel, and that is resonance: 5,032.9 Hz here, which is how a radio selects one station out of the whole band.

How the Inductance Calculator works

XL = 2πfL, so an inductor's opposition rises with frequency — it passes DC freely and blocks high frequencies. A capacitor does exactly the opposite. Where the two are equal they cancel, and that is resonance: the mechanism a radio uses to select one station out of the whole band.

Also known as: inductive reactance calculator · resonant frequency calculator · lc circuit calculator · reactance formula

Where to go next

The Inductance question rarely arrives on its own. These are the ones that usually come with it:

Capacitor Calculator — Series and parallel, which are the reverse of resistors.
RC Time Constant Calculator — τ = RC, with the charging percentages and the filter cutoff.
Power Factor Calculator — Real against apparent power, and the current it costs.
Speed Distance Time Calculator — Any one of the three from the other two, in four units.

Sources

Frequently asked questions

What is inductive reactance?

An inductor's opposition to alternating current, XL = 2πfL. A 1 mH inductor at 1 kHz presents 6.28 Ω.

How is it different from resistance?

Reactance stores and returns energy rather than dissipating it as heat, and it depends on frequency. A resistor behaves the same at every frequency; an inductor does not.

What is resonant frequency?

Where inductive and capacitive reactance are equal and cancel: 1/(2π√(LC)). A 1 mH and 1 µF pair resonates at 5.03 kHz.

Why does an inductor block high frequencies?

Because reactance is proportional to frequency. Double the frequency, double the opposition — which is what makes inductors useful as filters and chokes.

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