A magnetic-inductive flowmeter for determining the flow of a medium, having a measuring tube for guiding the medium and having two electrodes for tapping a measuring voltage induced in the medium, wherein the measuring tube has an inflow section, a measuring section and an outflow section arranged one after the other in the flow direction of the medium, the inflow section having a cross section which decreases in the flow direction, the measuring section having a constant cross section and being symmetrical with respect to a measuring section symmetry plane which runs parallel to the longitudinal axis of the measuring tube, and the outflow section having a cross section which increases in the flow direction and is formed at least partially asymmetrically with respect to the measuring section symmetry plane in order to increase measuring accuracy.