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Field on Axis of a Cylindrical Magnet Calculator

Calculates the field strength on the axis of an axially magnetized cylindrical magnet.

Fill in all of the black-outlined boxes and the results will appear in the light-gray boxes. Units may be selected as either CGS (Gauss, in.) or SI (mTesla, mm). The required geometrical inputs are defined in the diagram. This calculation works best with magnetic materials displaying "straight line" demagnetization curves.

Residual Induction (Br) data is on our magnet material pages.