Abstract: A system for determining a quantity of transported fluid, includes a measured parameter receiver (1) for obtaining a plurality of measured parameters relating to the fluid within the conduit at different measurement times during at least a predetermined time interval. A measured parameter combiner (2) for combining the measured parameters relating to the predetermined time interval, to obtain a first quantity indicative of an amount of fluid that has been transported through the conduit during the predetermined time interval. The system further includes a time interval divider (3) for dividing the predetermined time interval into a plurality of subintervals, and a parameter corrector (5) for determining a corrected value for at least one of the averaged parameters. A quantity corrector (6) for determining a corrected value for the quantity based on the corrected value for the at least one of the averaged parameters.