A method for determining a flow rate of a flowable medium, which flows through a measuring point, wherein the measuring point comprises: A first flowmeter, operating in accordance with the first measuring principle; and a second flowmeter (32, 34), operating in accordance with the second measuring principle; wherein both flowmeters (20, 32, 34) are configured to be exposed to the total flow rate of the medium; wherein the flowing medium exhibits status fluctuations, which impact the reliability of first measured values of the first flowmeter in a different way to the second measured values of the second flowmeter (32, 34); wherein the first measured values of the first flowmeter are more reliable than the second measured values of the second flowmeter (32, 34) for a first medium status, and the second measured values of the second flowmeter (32, 34) are more reliable than the first measured values of the first flowmeter for a second medium status; wherein a contribution to the flow rate is determined based on the first measured values if these are more reliable, wherein the second measured values are used if these are more reliable, wherein the contribution to the flow rate corresponding to the second measured values is determined based on the second measured values using a version of a transfer function (Fi) valid at the point in time at which the second measured values were determined, wherein an updated version of the transfer function (Fi) is determined if the measured values of the first flowmeter are more reliable, wherein the contribution to the flow rate previously determined based on the second measured values is subsequently corrected depending on the updated transfer function (F i), characterized in that the first flowmeter comprises a mass flowmeter, wherein the first measured values comprise mass flow rate measured values, and wherein the second flowmeter comprises a differential pressure flowmeter, wherein the second measured values comprise differential pressure measured values Δp, based on which mass flow rate measured values are determined using the transfer function F, wherein the transfer function is still proportional to a second term, which increases with the temperature T of the medium, wherein the transfer function F is F Δ p, T = C1 G Δp H T or F Δ p, T = C 1 G Δ p, T, wherein C1 is a constant and G and H are functions of Δp or T. A first flowmeter, operating in accordance with the first measuring principle; and a second flowmeter (32, 34), operating in accordance with the second measuring principle; wherein both flowmeters (20, 32, 34) are configured to be exposed to the total flow rate of the medium; wherein the flowing medium exhibits status fluctuations, which impact the reliability of first measured values of the first flowmeter in a different way to the second measured values of the second flowmeter (32, 34); wherein the first measured values of the first flowmeter are more reliable than the second measured values of the second flowmeter (32, 34) for a first medium status, and the second measured values of the second flowmeter (32, 34) are more reliable than the first measured values of the first flowmeter for a second medium status; wherein a contribution to the flow rate is determined based on the first measured values if these are more reliable, wherein the second measured values are used if these are more reliable, wherein the contribution to the flow rate corresponding to the second measured values is determined based on the second measured values using a version of a transfer function (Fi) valid at the point in time at which the second measured values were determined, wherein an updated version of the transfer function (Fi) is determined if the measured values of the first flowmeter are more reliable, wherein the contribution to the flow rate previously determined based on the second measured values is subsequently corrected depending on the updated transfer function (F i), characterized in that wherein a contribution to the flow rate is determined based on the first measured values if these are more reliable, wherein the second measured values are used if these are more reliable, wherein the contribution to the flow rate corresponding to the second measured values is determined based on the second measured values using a version of a transfer function (Fi) valid at the point in time at which the second measured values were determined, wherein an updated version of the transfer function (Fi) is determined if the measured values of the first flowmeter are more reliable, wherein the contribution to the flow rate previously determined based on the second measured values is subsequently corrected depending on the updated transfer function (F i), characterized in that the first flowmeter comprises a mass flowmeter, wherein the first measured values comprise mass flow rate measured values, and wherein the second flowmeter comprises a differential pressure flowmeter, wherein the second measured values comprise differential pressure measured values Δp, based on which mass flow rate measured values are determined using the transfer function F, wherein the transfer function is still proportional to a second term, which increases with the temperature T of the medium, wherein the transfer function F is F Δ p, T = C1 G Δp H T or F Δ p, T = C 1 G Δ p, T, wherein C1 is a constant and G and H are functions of Δp or T. wherein the transfer function is still proportional to a second term, which increases with the temperature T of the medium, wherein the transfer function F is F Δ p, T = C1 G Δp H T or F Δ p, T = C 1 G Δ p, T, wherein C1 is a constant and G and H are functions of Δp or T.