ELECTRONICS · CALCULATOR

Resonant frequency calculator

Free resonant frequency calculator: get resonant frequency from inductance and capacitance. The formula and a worked example are shown; verify against the NEC.

Written by Chameera Sampath · Not yet reviewed by a licensed electrician. See the methodology.

US (NEC) only · NFPA 70 / NEC — locally adopted editionDefaults are US values. Verify the locally adopted NEC edition and project data.Official reference ↗

Project inputs

Measurements

Inductance

Capacitance

µF

Updates as inputs change. Unit changes preserve the same physical values.

THE MATH BEHIND THE ANSWER

Method & assumptions

f0 = 1 / (2π√LC)

Ideal lumped LC circuit; parasitic losses excluded.

Results do not check every aspect of an electrical installation. The calculators follow US (NEC) practice only; a regional preset changes defaults such as voltage and units, and no result certifies NEC compliance.

Sources and validation →

Worked example

Inductance: 10 mH · Capacitance: 10 µF

Resonant frequency: 503.292 Hz

This example uses the stated inputs; results for the entered values appear above.

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