LC Circuit Calculator | Resonance, Tolerance Design & Impedance Sweep

Calculate LC and RLC resonance, impedance, Q, and bandwidth in simple, design, and analysis modes with tolerance ranges, standard-value snap, and sweep summary.

When Should You Use This Calculator?

Designing resonant tanks and tuned filters from target frequency
Evaluating impedance and phase behavior for RLC networks
Estimating resonance drift from component tolerance windows
Snapping computed L/C to practical E-series component values
Running sweep-style impedance analysis with optional parasitics

How to Use This Calculator

Select interface mode: Simple, Design, or Analysis.
Choose circuit type and target calculation (f, L, C, or Z).
Enter known component values with units.
In design mode, set tolerance and optional E-series snapping.
In analysis mode, add sweep/parasitic settings and inspect results.

Key Features:

Three modes: Simple, Design, and Analysis
Resonance, impedance, reactance, Q factor, and bandwidth
Tolerance frequency range and E-series standard-value snap
Impedance sweep summary with optional parasitic ESR analysis

Formula

Resonant Frequency: f = 1 / (2π√(LC)); Series Impedance: Z = R + j(XL - XC)

Design mode adds tolerance range and standard-value snapping.
Analysis mode summarizes sweep behavior around the operating region.

Frequently Asked Questions

What is the difference between simple, design, and analysis modes?

Simple mode solves the core LC/RLC equations quickly. Design mode adds tolerance range and standard-value snap support. Analysis mode adds sweep summary and optional parasitic ESR handling for more realistic behavior checks.

Why use tolerance and sweep features?

Tolerance range helps estimate resonance drift from real component variation. Sweep summary helps you see where impedance is lowest/highest around an operating region, useful for tuning filters and resonant networks.

Can I export my LC Resonant Circuit Calculator calculations?

Yes! In guest mode, you can export your calculations to JSON format. Sign in is required for PDF and CSV export. Click the export button to download your results. This is perfect for record-keeping, sharing with others, or importing into other tools.

Does this calculator save my history?

Yes! Your calculation history is automatically saved. Guest users can save up to 50 calculations per workspace locally. Sign in for free to save up to 100 calculations per workspace, with access from any device when logged in.

Is this calculator free to use?

Absolutely! The LC Resonant Circuit Calculator is completely free with no sign-up required. Create a free account to unlock additional features like more calculation history, multiple workspaces, and the ability to access your saved data from any device.

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