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A non iterative method for toroidal inductor design is proposed introducing an equation for fast estimation of the core size required as function of the wanted inductance and the maximum values specified for induction and current. Also, the core volume obtained may be compared with the one required for air gap core implementation, in order to assess an eventual oversizing of the selected core. By this way, a simple and fast tool for inductor design allows to decide between manufacture alternatives, material adoption or to foresee board room in converter design. Moreover, the proposed method allows design inductors accepting a broad tolerance of the core material features.