Capacitive reactance
Xc = 1 / (2 pi f C)
Electrical calculator
RC / RL / RLC Circuit Calculator
Analyze impedance, phase angle, and resonance for basic AC circuits.
Calculator
Enter values
Results update automatically as you type.
Result
About this calculator
How it works
This calculator estimates reactance, impedance magnitude, phase angle, and resonance for common AC circuit arrangements.
Formulas
Formulas used
Inductive reactance
Xl = 2 pi f L
Impedance
|Z| = sqrt(R^2 + X^2)
Resonance
f0 = 1 / (2 pi sqrt(L C))
Guide
How to use this calculator
- Choose the mode or component type if the calculator provides one.
- Enter known values and select the units beside each input.
- Read the highlighted result first, then use the table for supporting calculated values.
Reference
What the results mean
Reactance
Frequency-dependent opposition from capacitors or inductors.
Impedance
Total AC opposition combining resistance and reactance.
Phase angle
Whether the circuit behaves more capacitively or inductively.
FAQ
RC / RL / RLC Circuit Calculator questions
Can I use different units?
Yes. Select the unit beside each input. The calculator converts values internally before solving.
Are the results suitable for final design?
Use results for education, screening, and early design checks. Verify final work against standards, datasheets, and project requirements.
Why does the result update automatically?
The calculator listens for input changes and recalculates as soon as enough valid values are available.
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