Acid soluble collagen (ASC) and a cattle hide gelatine were analyzed by size exclusion chromatography (SEC) coupled with multi angle light scattering (MALS). The SEC system was calibrated with ASC and its cyan bromide cleavage products. The accuracy of calibration was confirmed by MALS by measuring the mass-average molar masses (M-W). ASC acted as a mixture of two polymer standards of M-W = 90 and 180 kg/mol, respectively. The elution behavior of the gelatine in SEC-MALS was similar to that of ASC. Therefore, the determination of the molar mass distribution of this gelatine was possible either by SEC, using a calibration curve, or by MALS by direct measurement of M-W. According to the scaling law (1/2) = KMalpha, alpha = 0.78 was determined for the gelatine. This alpha could reflect a structure in solution, which is more similar to an ellipsoid than to a random coil.