Inductor Reactance Chart

Use this inductor reactance chart after the calculator result to document inductance, frequency, XL, winding resistance, and the next impedance or filter check.

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Quick reference table

Inductive reactance is XL = 2 pi f L: 100 mH at 60 Hz = 37.7 ohms, while 10 mH at 1 kHz = 62.8 ohms. Reactance rises as frequency or inductance increases. Use this chart after the calculator result to separate ideal reactance from real coil behavior such as winding resistance, saturation, current rating, and core material.

Inductive reactance snapshots

Inductive reactance snapshots
Inductance	XL at 60 Hz	XL at 1 kHz	Typical use note
100 uH	0.038 ohm	0.63 ohm	Small choke or high-frequency reference
1 mH	0.38 ohm	6.28 ohm	Filter or signal estimate
10 mH	3.77 ohm	62.8 ohm	Control or filter coil check
100 mH	37.7 ohm	628 ohm	Large inductance reference
1 H	377 ohm	6.28 kOhm	High inductance, current rating matters

Reactance result follow-up

Reactance result follow-up
Circuit task	What XL tells you	What to verify next
Filter or choke estimate	Opposition at the selected frequency	Current rating, saturation, and winding resistance
Coil comparison	How frequency changes AC opposition	DC resistance and nameplate or datasheet values
Impedance calculation	Reactive component of impedance	Combine with resistance using impedance calculator
Bench troubleshooting	Expected AC behavior trend	Measure actual coil condition and temperature

Calculator handoff for inductor reactance work

Calculator handoff for inductor reactance work
Search intent	Open the calculator when	Keep with the result
Inductance and frequency lookup	The value must be converted between uH, mH, and H before XL is trusted	Original value, converted inductance, frequency, and voltage or current context
Filter or choke estimate	XL must be compared with winding resistance, current rating, saturation, and expected operating band	Circuit role, DC resistance, current rating, core note, and temperature assumption
Impedance or RL calculation	Reactance needs to be combined with resistance, capacitance, or phase angle in a larger circuit	Resistance value, frequency, phase context, and impedance calculator output
Coil or equipment troubleshooting	Measured behavior differs from the ideal chart and the result needs a record trail	Measured winding resistance, nameplate value, temperature, and datasheet limit

Formula basis

XL = 2 x pi x f x L. Ideal AC current estimate: I = V / XL.

XL is inductive reactance in ohms.
f is frequency in hertz.
L is inductance in henries.
Winding resistance is separate from reactance and must be added in real impedance checks.

Worked examples

Estimate 100 mH at 60 HzXL = 2 x pi x 60 x 0.1 = about 37.7 ohms. If the coil also has winding resistance, the impedance check must include both values.

Compare 10 mH at 1 kHzXL = 2 x pi x 1,000 x 0.01 = about 62.8 ohms. That same 10 mH inductor is only about 3.77 ohms at 60 Hz, so frequency changes the decision.

Assumptions. Balanced load and line-to-line voltage assumptions behind this chart.

The chart uses ideal inductance and does not include winding resistance, core saturation, parasitic capacitance, tolerance, or temperature effects.
Real inductors can change behavior with current, frequency, temperature, core material, and mounting conditions.
Inductor reactance is only one part of impedance and does not by itself confirm current rating or equipment suitability.

Code and standard notes. Planning limits that should be checked before final equipment selection.

Use component datasheets, measured winding resistance, and equipment ratings before using inductive reactance for filter, coil, or equipment decisions.

How to use this chart

1Convert inductance firstConvert mH or uH into henries before using the reactance formula or comparing to the calculator result.

2Use the operating frequencyRecord whether the check is at 60 Hz, 400 Hz, a signal frequency, or another operating frequency because XL changes directly with frequency.

3Separate coil resistanceAfter the calculator result, record measured winding resistance so the real impedance can be checked with the right calculator.

Worksheet checklist. Record source basis, review gaps, and assumptions before using the chart result.

Record L and frequencyWrite inductance, converted henries, frequency, and voltage or current context before calculating XL.
Add real coil dataDocument winding resistance, current rating, core type, and any datasheet limits that affect the decision.
Check the next calculationUse impedance or filter calculations when reactance needs to be combined with resistance or capacitance.

Common mistakes to avoid. Review these before turning chart current into an equipment decision.

Using a 60 Hz reactance value for a circuit operating at a much higher signal or switching frequency.
Treating XL as the same thing as measured winding resistance from a DC meter.
Ignoring saturation and current rating when the inductor is used in a power or filter path.

Frequently asked questions

These answers explain how to use the chart without turning a quick reference into a final design decision.

Does inductive reactance increase with frequency?

Yes. XL is directly proportional to frequency, so the same inductor has more reactance at higher frequency.

Is reactance the same as winding resistance?

No. Winding resistance is a DC resistance value. Reactance is AC opposition caused by inductance.

Why can a real inductor differ from the chart?

Core material, saturation, winding resistance, parasitic capacitance, and temperature can all move real behavior away from the ideal formula.

When should I open the inductor reactance calculator?

Open the calculator when inductance, frequency, unit conversion, winding resistance, and current rating need to stay together before an impedance, filter, or troubleshooting decision.