Inductive Reactance Calculator
The inductive reactance calculator estimates the magnitude of ideal inductor opposition to sinusoidal alternating current at a chosen frequency.
How to use this calculator
- Enter a positive frequency in hertz and inductance in millihenries.
- Check the units and definitions before comparing results with another source.
- Change one input at a time when comparing scenarios, and keep the reporting period and assumptions consistent.
Formula used by the inductive reactance calculator
Xl = 2πfL
- Xl = 2πfL
- Core behaviour, winding resistance, saturation, parasitic capacitance and self-resonance are not represented.
- Inputs are checked for required values and valid ranges; displayed results are rounded for readability.
Worked examples
Worked example
A 100 mH inductor at 1,000 Hz.
Xl = 2π×1,000×0.1 ≈ 628.32 Ω.
Xl = 2π×1,000×0.1 ≈ 628.32 Ω.
Understanding the result
The inductive reactance calculator estimates the magnitude of ideal inductor opposition to sinusoidal alternating current at a chosen frequency.
Core behaviour, winding resistance, saturation, parasitic capacitance and self-resonance are not represented.
Important notes
Core behaviour, winding resistance, saturation, parasitic capacitance and self-resonance are not represented.
The result applies to the numbers and assumptions entered here; verify specifications for safety-critical or regulated uses.
Frequently asked questions
What happens when frequency increases?
Inductive reactance rises linearly with frequency for a fixed ideal inductance.
Does this calculate DC resistance?
No. At zero frequency the ideal inductive reactance is zero; this tool is for positive AC frequency.
How do I use this calculator?
Enter a positive frequency in hertz and inductance in millihenries.
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.