Calculate Resonant Frequency using simple colpitt oscillator calculator.
Formula:
C = (C1 × C2) / (C1 + C2)
f0 = 1 / (2π × √LC)
L = coupled inductor
C1 = coupled capacitor 1
C2 = coupled capacitor 2
C = Equivalent capacitance of the coupled capacitors
f0 = resonant frequency