Circuit Analysis calculator
Circuit Analysis Calculator
Use this circuit calculator to enter a one-source DC resistive load, AC series RLC path, or AC parallel RLC branch set before comparing operating-point current, impedance, power, and power factor. It is intentionally narrower than SPICE, a nodal solver for large networks, or a transient sweep engine.
Updated July 10, 2026
Choose DC resistive, AC series RLC, or AC parallel RLC, then enter the source, frequency, resistance, inductance, and capacitance values that match your circuit before comparing current and power factor.
DC mode: I = V / R | AC series: Z = R + j(XL - XC) | AC parallel: solve Y = G + jB first, then Z = 1 / Y
Choose DC resistive, AC series RLC, or AC parallel RLC below and enter one honest operating point
Example Calculations
How to Use
What this circuit analysis calculator actually covers
| Mode | What you enter | What the page returns |
|---|---|---|
| DC resistive | Source voltage and equivalent resistance | Current, power, conductance, and load voltage |
| AC series RLC | Voltage, frequency, resistance, inductance, and capacitance in one series path | Reactance, impedance, current, phase angle, power factor, power, and component voltages |
| AC parallel RLC | Voltage, frequency, and one parallel branch set with R, L, and C | Admittance-based impedance, line current, branch currents, phase angle, power factor, and power |
Why this page is narrower than a generic "circuit solver"
Searchers often want a circuit analysis calculator, but that phrase can mean many different things. Instead of pretending to solve arbitrary multi-loop networks, this page stays honest: it solves one source feeding one equivalent load path or one parallel branch set. That makes the math transparent and auditable.
Core relationships used here
DC current: I = V / R
Inductive reactance: XL = 2 x pi x f x L
Capacitive reactance: XC = 1 / (2 x pi x f x C)
Series impedance: Z = R + j(XL - XC)
Parallel admittance: Y = G + jB, then Z = 1 / Y
How to use the AC series mode
- Enter the RMS source voltage and operating frequency.
- Enter the equivalent resistance plus any inductance or capacitance in the series path.
- Read reactance, impedance magnitude, phase angle, current, and power factor together.
- Use the component-voltage outputs to see how the resistor, inductor, and capacitor divide the source voltage at that one operating point.
How to use the AC parallel mode
- Enter the RMS source voltage and operating frequency.
- Enter the resistive branch plus any inductor and capacitor branches.
- The page converts the branches into equivalent admittance first, then returns equivalent impedance, line current, and branch currents.
- Read the phase angle and power factor as a line-current result, not as a claim that the page solved a whole distribution network.
What this page does not claim
- It does not solve arbitrary multi-node circuits with several independent sources.
- It does not perform transient waveforms, frequency sweeps, or harmonic studies.
- It does not replace the dedicated impedance, RC, series-circuit, or parallel-circuit pages when those more specific tools match the job better.
- It does not replace field measurement on a live system.
Try these presets after opening the calculator
Use the preset buttons for a DC resistive load, an AC series RLC path, or an AC parallel RLC branch set, then review the generated result inside the calculator. Treat those presets as input examples, not as universal circuit answers.
When to use a different calculator
Use the Impedance Calculator when the job is complex impedance or resonance only, the Series Circuit Calculator or Parallel Circuit Calculator when the network is resistive and branch-by-branch, and the RC Circuit Calculator when the real question is time constant or cutoff behavior.
Common Applications
More applications. Open to review 3 additional use cases.
Frequently Asked Questions
What kind of circuit does this page actually solve?
It solves one source feeding one equivalent DC resistive load, one series RLC path, or one parallel RLC branch set at one frequency. It is not a general multi-loop or multi-source circuit solver.
Why are AC series and AC parallel separate modes?
Because the math is different. Series work is solved through impedance directly, while parallel work is solved through admittance first and only then converted back to equivalent impedance. Keeping them separate prevents misleading "one formula fits everything" results.
Can I use this page as an AC circuit calculator?
Yes, if the AC problem can honestly be reduced to one series RLC path or one parallel RLC branch set at one operating frequency. If the network is larger than that, use a more specialized analysis tool.
Does this page perform transient or frequency-sweep analysis?
No. It is an operating-point screen at one frequency or one DC condition only. That is why the page no longer claims transient or sweep behavior that it does not actually calculate.
When should I move to a more specific calculator?
Move to the impedance page when the job is only impedance, to the RC page when the job is timing or cutoff behavior, and to the dedicated series or parallel pages when you need a more direct resistive network workflow.
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