Inductive Reactance Calculator
Calculate inductive reactance and the current an inductor passes at a given frequency.
About Inductive Reactance Calculator
Inductive reactance is proportional to frequency, so an inductor passes DC freely and blocks high frequencies. That behaviour is what makes inductors useful as chokes and in low-pass filtering. A mains-frequency choke becomes almost an open circuit at switching frequencies, which is why the same component behaves so differently in a power supply.
Formula
Inductive Reactance
X_L = 2πfL; I = V ÷ X_L
- X_L
- Inductive reactance in ohms, proportional to frequency
Worked example
With the default values below, Inductive Reactance Calculator returns Inductive Reactance of 31.4159. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Inductanceminimum 0 H
- 0.1 H
- Frequencyminimum 0.01 Hz
- 50 Hz
- Applied voltageminimum 0 V
- 230 V
Results
- Inductive Reactance
- 31.4159 ohm
- Current Drawn
- 7.32113 A
- Reactance at Double the Frequency
- 62.8319 ohm
- Reactive Power
- 1,683.859 VAR
- Peak Energy Stored
- 5.359891 J
Step by step
- 1Values used
- 2Inductive Reactance
- 3Inductive Reactance= 31.4159 ohm
- 4Current Drawn= 7.32113 A
- 5Reactance at Double the Frequency= 62.8319 ohm
- 6Reactive Power= 1,683.859 VAR
- 7Peak Energy Stored= 5.359891 J
Assumptions and limits
- The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax or fees or charges into account.
- Figures are rounded for display to 6 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
How is Inductive Reactance calculated?
X_L = 2πfL; I = V ÷ X_L Inductive reactance is proportional to frequency, so an inductor passes DC freely and blocks high frequencies. That behaviour is what makes inductors useful as chokes and in low-pass filtering.
Why does Inductive Reactance matter?
A mains-frequency choke becomes almost an open circuit at switching frequencies, which is why the same component behaves so differently in a power supply.
What values do I need to enter?
This calculator takes 3 inputs: Inductance, Frequency, Applied voltage. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.