Capacitive Reactance Calculator
Find a capacitor's reactance at a given frequency.
Capacitive reactance is a capacitor's frequency-dependent opposition to AC current.
The math behind it
Xc = 1 ÷ (2π·f·C). It falls as frequency rises, so capacitors pass high frequencies more easily.
Worked example
60 Hz, 10 µF → about 265 Ω.
FAQ
Why does it block DC?
At 0 Hz the reactance is infinite, so no steady DC flows.