This paper examines the short-term deflection of reinforced concrete slabs taking the tension-stiffening phenomenon into account. The main goal of this study is to develop a model that predicts the deflection of one-way slabs made of reinforced concrete. The model takes into account concrete contribution in carrying tension between cracks thoroughly considering the stress-strain relationship material model. The model has been developed using MATLAB Program incorporating a numerical technique known as the layered approach. The developed layered approach model was validated using experimental deflection results reported in a previous study. Based on the experimental validation, the model showed its tendency in predicting the real-case deflection of one-way concrete reinforced slabs. It was concluded that different types of tension stiffening models can be added to the program to model deflection and crack propagation.