Inductive Reactance Calculator
Calculate inductive reactance from inductance and frequency, or solve for the missing value, free in your browser with this reactance calculator.
Enter Values
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How to use this calculator
- Enter the frequency and inductance.
- Press Calculate.
How it works
Inductive reactance = 2 × π × frequency × inductance (in henries) — the AC 'resistance' of an inductor.
Worked example
50 Hz, 100 mH. ≈ 31.4 Ω.
Common mistakes
- Using millihenries directly — convert mH to henries (×0.001) first.
- Forgetting that reactance rises with frequency, so the same coil opposes high frequencies far more.
Frequently asked questions
How is inductive reactance calculated?
XL = 2π × frequency × inductance, in ohms. A 10 mH coil at 50 Hz has XL = 2π × 50 × 0.01 ≈ 3.14 Ω.
Why does reactance increase with frequency?
A faster-changing current induces a larger opposing voltage in the inductor, so it resists higher frequencies more strongly.
What happens to reactance as frequency rises?
It increases — an inductor opposes higher-frequency AC more strongly. At DC (0 Hz) the reactance is zero.
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Cite this tool
Zerdly. (2026). Inductive Reactance Calculator. Retrieved from https://www.zerdly.com/tools/inductive-reactance-calculator/
Tip: Enter any known values to calculate the remaining results.
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