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Controlling deflections by the indirect method of minimum thickness is based largely on experience rather than well-documented objective measures. It is therefore necessary to develop a more rational approach to determine the appropriate span-to-depth ratios that satisfy the allowable deflection limits. Due to inherent variability of the geometric dimensions, material properties and loads, a probabilistic model is developed to assess the minimum thickness requirements for one-way members corresponding to the maximum permissible deflections specified in Design Code of Concrete Structure. Monte Carlo simulation is performed to infer probabilistic descriptions of span-to-depth ratios for reinforced concrete one-way members. The minimum thickness values given in the Design Code are investigated by the probabilistic analysis. The effects of design variables on the minimum thickness values are also shown by the results of a parametric study.