About the Reactance Calculator
Capacitive and inductive reactance at a given frequency, and the resonant frequency of an LC pair.
Also known as: capacitive reactance, inductive reactance, xc xl calculator, lc resonance.
How to use this calculator
- Enter frequency, capacitance, inductance.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
Xc = 1 / 2πfC · Xl = 2πfL · f₀ = 1 / 2π√(LC)
Worked example
Using the values pre-filled in the calculator above:
- Frequency = 1,000 Hz
- Capacitance = 1 µF
- Inductance = 10 mH
the calculator returns:
- Capacitive reactance Xc: 159.155 Ω
- Inductive reactance Xl: 62.8319 Ω
- Net reactance: -96.323 Ω
- Resonant frequency: 1,591.55 Hz