LC Resonant Frequency Calculator

Calculate the resonant frequency of an LC tank circuit. Enter any two of frequency, inductance, or capacitance and the third is solved for you — plus the characteristic impedance, angular frequency, and period. Leave one field blank to solve for it; fill all three to cross-check. Runs locally in your browser.

Frequency

hertz (cycles/second)

Inductance (L)

henries

Capacitance (C)

farads

Enter any two of the three values to compute the third.

A resonant LC tank circuit oscillates at f = 1 / (2π · √(L·C)) The characteristic impedance of the tank is Z = √(L / C) (in ohms), the angular frequency is ω = 2π·f and the period is T = 1/f. Leaving exactly one field blank solves for it; filling all three cross-checks that they're consistent (within 0.1%). Values must be positive. Runs locally — nothing leaves your browser.