Method for calculating the density of a medium which is guided in at least one oscillating measuring tube of a density meter: Excitation of bending vibrations of the measuring tube in a bending vibration useful mode at a useful mode operating frequency, wherein the useful mode operating frequency depends on the density of a medium guided in the measuring tube and on at least one disturbance variable; Determining a characteristic value of the useful mode operating frequency; Determining a value representing the disturbance variable; Calculating a correct density value of the medium as a function of the characteristic value of the useful mode operating frequency and the value representing the at least one disturbance variable; characterized in that the method further comprises: Calculating a characteristic value of the standard frequency as a function of the correct density value, where the standard frequency is the frequency which gives the correct density value when the density is calculated using a frequency-dependent standard function which is not dependent on the disturbance variable; Providing a signal that represents the standard frequency, wherein the provided signal controls an oscillator which outputs an oscillator signal oscillating at the standard frequency in response to the provided signal; and Calculation of the density by means of a processing unit which has a frequency input to which the oscillator signal is applied, which is compared with the standard frequency input. frequency, whereby the processing unit calculates the density using the standard function. Excitation of bending vibrations of the measuring tube in a bending vibration useful mode at a useful mode operating frequency, wherein the useful mode operating frequency depends on the density of a medium guided in the measuring tube and on at least one disturbance variable; Determining a characteristic value of the useful mode operating frequency; Determining a value representing the disturbance variable; Calculating a correct density value of the medium as a function of the characteristic value of the useful mode operating frequency and the value representing the at least one disturbance variable; characterized in that the method further comprises: Calculating a characteristic value of the standard frequency as a function of the correct density value, where the standard frequency is the frequency which gives the correct density value when the density is calculated using a frequency-dependent standard function which is not dependent on the disturbance variable; Providing a signal that represents the standard frequency, wherein the provided signal controls an oscillator which outputs an oscillator signal oscillating at the standard frequency in response to the provided signal; and Calculation of the density by means of a processing unit which has a frequency input to which the oscillator signal is applied, which is compared with the standard frequency input. frequency, whereby the processing unit calculates the density using the standard function. Calculating a characteristic value of the standard frequency as a function of the correct density value, where the standard frequency is the frequency which gives the correct density value when the density is calculated using a frequency-dependent standard function which is not dependent on the disturbance variable; Providing a signal that represents the standard frequency, wherein the provided signal controls an oscillator which outputs an oscillator signal oscillating at the standard frequency in response to the provided signal; and Calculation of the density by means of a processing unit which has a frequency input to which the oscillator signal is applied, which is compared with the standard frequency input. frequency, whereby the processing unit calculates the density using the standard function.