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Mihsaba›Capacitive Reactance Calculator

Capacitive Reactance Calculator

Calculate capacitive reactance from frequency and capacitance with engineering units, plus angular frequency and optional RMS current.

These are ideal-circuit educational calculations; real component tolerance, temperature and parasitic effects are not modeled.

How to use

Capacitive reactance is an ideal capacitor’s opposition magnitude to sinusoidal AC. Xc falls as frequency or capacitance rises.

  1. Enter frequency and unit.
  2. Enter capacitance and unit.
  3. Optionally enter RMS voltage.
  4. Review Xc, ω and current.

How it is calculated

Xc=1/(2πfC); ω=2πf; with RMS voltage: I=V/Xc

Example

Example: 10 µF at 60 Hz gives Xc≈265.26 Ω.

Important notes

Reactance is not dissipative resistance; ESR and parasitics can change real behavior.

Frequently asked questions

What happens as frequency rises?

Xc decreases inversely with f.

What about DC?

As f→0, Xc tends to infinity.

Is the current idealized?

Yes, for a pure capacitor.