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Inductive Reactance Calculator.

Calculate inductor reactance from frequency and inductance.

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Reactance: 37.699112

Reactance

37.699112

Educational SI models with assumptions stated in each description; verify engineering decisions independently.

Use Cases

Design AC circuits and filters

Determine the reactance of an inductor at a specific frequency to design filters, tuning circuits, or impedance matching networks.

Example: Calculate XL for a 10 mH inductor at 50 Hz: XL = 2π × 50 × 0.01 ≈ 3.14 Ω.

Analyze inductor behavior in AC circuits

Understand how an inductor's opposition to current changes with frequency, helping in circuit analysis and troubleshooting.

Example: For a 100 μH inductor at 1 MHz, XL ≈ 628 Ω.

Frequently Asked Questions

What is inductive reactance?
Inductive reactance (XL) is the opposition that an inductor presents to alternating current (AC). It increases with frequency and inductance. The formula is XL = 2πfL, where f is frequency in hertz and L is inductance in henries. The result is in ohms.
How do I use this calculator?
Simply enter the frequency in hertz (Hz) and the inductance in henries (H) into the respective fields. The calculator will compute the inductive reactance in ohms using the formula XL = 2πfL. Ensure you use consistent units (Hz and H) for accurate results.
What units should I use for frequency and inductance?
The calculator expects frequency in hertz (Hz) and inductance in henries (H). If you have values in other units (e.g., kHz or mH), convert them to Hz and H before entering. For example, 1 kHz = 1000 Hz and 1 mH = 0.001 H.

Tips & Common Mistakes

Tips

  • Ensure frequency is in hertz (Hz) and inductance in henries (H) to get reactance in ohms. Convert kHz to Hz (multiply by 1000) and mH to H (divide by 1000).
  • Remember that inductive reactance increases linearly with frequency and inductance. Doubling either doubles XL.
  • Use this calculator for AC circuits only; for DC, an inductor acts as a short circuit (XL = 0).
  • For complex impedances, combine inductive reactance with resistance using phasor addition, not simple arithmetic.

Common Mistakes to Avoid

  • Forgetting to convert units: entering inductance in millihenries (mH) without converting to henries (H) will give incorrect results.
  • Using frequency in kHz instead of Hz without conversion, leading to reactance values off by a factor of 1000.
  • Confusing inductive reactance with impedance: reactance is only the imaginary part of impedance; resistance must be considered separately.

Last updated: August 13, 2026