eleif.net/ lc.html (2015-07-21, updated 2018-04-16)

# Online ideal resonant tuned LC tank circuit calculator

Calculate ideal resonant tuned circuit (LC tank) (Wikipedia) parameters in your browser.
This may be helpful to estimate component values when e.g. building an oscillator or winding coils (e.g. RFID antenna, inductive sensor, induction heater).
Of course, a real, non-ideal circuit then will have to be tuned to the desired oscillation frequency.

This calculator solves the resonant frequency equation for either f (frequency in Hertz), C (capacitance in Farad) or L (inductance in Henry).
Just enter the two knowns and the unknown will be calculated automatically. Alternatively, click a button for the remaining value.
The input fields accept values with decimal point or comma, SI prefixes from pico (e-12) to Giga (e9) e.g. "1 k", or e notation ("ex" representing "*10^x" in scientific notation), e.g. "1.0e3". It also handles simple expressions (e.g. addition).
The result will also be given with the SI prefices used in engineering notation, though not neccessarily in the typical component value range (e.g. uF for capacitors).

1/(2*pi*sqrt(L*C)) = f =
Hz

(1/(2*pi*f))^2 / C = L =
H

(1/(2*pi*f))^2 / L = C =
F

Last values:

Just in case, here are some engineering SI unit prefixes and their powers (e notation):
 Giga G 1e+09 1*10^9 1 000 000 000 billion Mega M 1e+06 1*10^6 1 000 000 million Kilo K 1000 1*10^3 1 000 thousand - - 1 1*10^0 1 - milli m 0.001 1*10^-3 0.001 thousandth micro μ or just u 1e-06 1*10^-6 0.000 001 millionth nano n 1e-09 1*10^-9 0.000 000 001 billionth pico p 1e-12 1*10^-12 0.000 000 000 001 trillionth