Literature data for the molar heat capacities of liquid n-alkanes from pentane to hexacosane were fitted to a function of temperature and number of carbon atoms in the chain. The part of the heat capacity curves directly after the melting point was not taken into consideration. The function C-p = {43.9 + 13.990 (n - 1) + 0.05430.(n - 1)T} J K-1 mol(-1) describes the experimental data to within the experimental error. The average percentage deviation is 0.18%. New measurements for the liquid heat capacity of heptadecane and octadecane are reported.