Inductive and Capacitive Reactance Calculator
Reactance of a coil and a capacitor at a given frequency, plus the resonant frequency of the pair.
Results
Impedance
31.4159
Ω
Impedance
318.3099
Ω
Frequency
159.155
Hz
What this tool does
Reactance is the opposition that coils and capacitors present to alternating current, and it depends on frequency: inductive reactance rises with frequency while capacitive reactance falls. Where the two are equal, the circuit is at resonance, which is the third result shown here.
Formula
X_L = 2πfL · X_C = 1 ÷ (2πfC)
Variables
| Symbol | Meaning | Unit |
|---|---|---|
f | Frequency | Hz |
l | Inductance | mH |
c | Capacitance | µF |
XL | Impedance | Ω |
XC | Impedance | Ω |
fr | Frequency | Hz |
Worked example
- Frequency50 Hz
- Inductance100 mH
- Capacitance10 µF
- Impedance31.4159 Ω
- Impedance318.3099 Ω
- Frequency159.155 Hz
Limitations
- The calculation runs at full precision and only the display is rounded. If you copy an intermediate value and retype it, small differences can appear.