The most of similar calculators work using Wheeler's formula, which has acceptable accuracy only when calculating the "optimal coil". Also, these calculators allow to calculate just a ready-made coil. This calculator allows to calculate the number of windings of the multilayer coil at the design stage. Inductance is calculated by accurate algorithm using Maxwell's equations with elliptic integrals, see more... You can select measurement units - mm or inches, and also AWG or SWG wire number - the wire diameter will be determined automatically.
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