Does capacitive reactance decrease with frequency?
Yes. Ideal capacitive reactance is inversely proportional to frequency.
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Capacitive Reactance Calculator — XC from Frequency & Capacitance
Calculate ideal capacitor reactance from frequency and capacitance with common frequency and capacitance units.
Result
31.830989 Ω
50 Hz · 0.0001 F
X_C = 1/(2πfC)
Formula and worked example
X_C = 1 ÷ (2πfC).
At 50 Hz, a 100 µF ideal capacitor has about 31.831 Ω of capacitive reactance.
Assumptions
- Frequency and capacitance must be positive.
- ESR, ESL, leakage and dielectric behavior are outside the ideal reactance relation.
Last updated: 2026-09-16
Frequently asked questions
What happens at zero frequency?
The ideal formula tends toward infinite reactance, so this calculator requires a positive frequency.