Electronics Calculators

Below are some useful links for calculating various values used in electronics.

• Calculate inductance of an air core inductor
• Calculate resonant frequency of an LC circuit

Air Core Inductor Calculator

The following is a design tool based on Weaver's formula which calculates the inductance of an air core inductor.

L = (d² * n²) / (18d + 40l)

where:

L is inductance in micro Henrys,
d is coil diameter in inches,
l is coil length in inches, and
n is number of turns.

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LC Resonance Calculator

The following is a design tool which calculates the resonant frequency of an LC circuit.

f = 1 / (2 π $\sqrt{\mathrm{LC}}$)

where:

L is inductance in Henrys,
C is capacitance in Farads, and
f is resonant frequency in Hertz.

The tool below uses more convenient values. Enter any two parameters and the calculator will present the third parameter for a resonant circuit.

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