The document proposes a new simple method for predicting face deformations of retaining walls reinforced with geosynthetics. The method uses a theoretical model that treats the wall as a beam leaning on flexible supports subjected to a theoretical diagram of horizontal earth pressures. It was found to provide good predictions of horizontal stresses and face deformations for various wall configurations when compared to laboratory and numerical studies, while being simple, quick, and based on a theoretical model. The method could be a versatile tool for predicting retaining wall performance.