To predict the cracking time properly is a major indication to evaluate the service life of corroded reinforced concrete (RC) structures. Based on the assumption of uniform corrosion of steel reinforced bar, a model to predict the time from initiation to corrosion cracking is proposed. Finally, the data presented in the published literatures are picked up for the comparison between the proposed model and Maaddawy's model. The results illustrate that the proposed model is in good agreement with the test results and better than the model suggested by Maaddawy.