Science & Engineering

Capacitive Reactance (Xc) Calculator

Find capacitive reactance from any capacitance and signal frequency using Xc = 1 / (2 pi f C). Unit selectors cover pF through F and Hz through GHz, with auto-scaled output in ohms.

How to use
  1. Enter the capacitance and choose its unit (pF, nF, uF, F).
  2. Enter the signal frequency and its unit (Hz to GHz).
For study and estimation. Verify against authoritative data before relying on a result.
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Common questions

What is capacitive reactance?

It is the opposition a capacitor presents to alternating current, measured in ohms. It falls as frequency rises.

Why does reactance drop at higher frequency?

Because Xc is inversely proportional to frequency. A capacitor passes high-frequency signals more easily than low-frequency ones.

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