Resonant Frequency Calculator

Free Resonant Frequency Calculator — find the natural frequency of LC circuits and spring-mass systems.

914.4K uses Updated · 2026-05-11 Runs locally · zero upload
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The Resonant Frequency Calculator computes the natural frequency of either an LC tank circuit or a spring-mass mechanical oscillator from first-principle formulas.

How to Use Resonant Frequency Calculator

  1. Choose a system — LC circuit or spring-mass system.
  2. Enter the parameters — L and C for circuits, k and m for mechanical systems.
  3. Read the natural frequency — automatically shown in Hz, kHz or MHz.
  4. Verify the formula — the calculator displays which equation was applied.

Formula & Theory — Resonant Frequency Calculator

f = 1 / (2π · sqrt(L · C))
f = (1 / 2π) · sqrt(k / m)

Use Cases for Resonant Frequency Calculator

  • RF tank design — pick L and C for a target operating frequency.
  • Mechanical engineering — predict the natural frequency of suspension systems.
  • MEMS & sensors — estimate the resonance of accelerometers and gyroscopes.
  • Education — illustrate the duality between electrical and mechanical oscillators.

Frequently asked questions about Resonant Frequency Calculator

Does damping change the resonant frequency?

In practice damping shifts the peak slightly below the natural frequency, and at high damping the system no longer oscillates. The formula here assumes negligible damping.

What units should I use?

Use SI units (H, F, kg, N/m). The calculator converts μF, mH, etc. automatically.

Why does halving C raise the frequency?

Resonance depends on √(L·C); reducing either L or C reduces the period, raising frequency.

Is my data stored?

No. All calculations run locally in your browser; nothing is sent to any server.