The use of thin glass in construction promises a variety of potentials for a more sustainable use of resources. Innovative constructions can enable thin glass to become an important component of structural glass engineering. However, there is still a lack of in-depth knowledge and corresponding standards for a reliable and regulated use of thin glass. One particular challenge is the determination of the bending tensile stresses. Due to the low geometric stiffness, conventional test methods such as the four-point bending test can no longer be applied. Alternative test methods have already been developed and investigated. Thereby, an increased influence of the Poisson effect with decreasing thickness of the glass has been determined. The test specimens deform far beyond the small deformation field an activating non-linear behavior which lead to no longer unidirectional stress distribution. This research investigates the influence of the geometric dimensions of a test specimen on the stresses calculated by the linear elastic Euler–Bernoulli theory. For this purpose, an extensive parameter study is carried out by means of the finite element method. With more than 200 variants, the maximum stresses as well as their distribution over the width is compared. This leads to a more accurate understanding of the effect of transverse strain at large deformations and helps in the selection of geometry and a more realistic evaluation of ultimate stresses in thin glass.