A Coriolis flow measuring device having: At least one exciter system, which causes at least one measuring tube flowed-through by a medium to oscillate; a first measured value pickup which is provided in the region of the inlet of the measuring tube and which outputs an entrance signal; a second measured value pickup, which is arranged in the region of the outlet of the measuring tube and which outputs an exit signal; and a control/evaluation unit, which determines a phase displacement, or a difference of the phase angles, between the entrance signal and the exit via a CORDIC algorithm and which, on the basis of the calculated phase displacement, or on the basis of the calculated phase angle difference, determines mass flow rate, density and/or viscosity of the medium flowing in the measuring tube.