Drying of concrete elements result in the loss of capillary moisture and rendering it susceptible to deterioration. The aspect of deterioration largely depends on the evolving state of internal relative humidity (IRH) in concrete during the intended service period. The aim of present work is to investigate the trend of IRH distribution in drying concrete cubes of three water-to-cement (w/c) ratios kept in an indoor residential condition for the period of 378 days. While the IRH distribution in concrete has been widely conferred in earlier literature, studies related to fitting such profiles using some mathematical empirical models are not comprehensive and hard to find in the existing literature. This study addresses the gap by fitting the experimentally obtained IRH data with different empirical models used in earlier studies. The most suitable model was identified based on R2 value of fits and the trend of obtained coefficients are discussed with respect to w/c.