The academic performance and outcomes of students are significantly impacted by the architecture of educational institutions. When designing learning spaces, two important considerations are the size of the room and the elevation opening percentage that describe how much daylight enters the space through windows. Previous studies showed that these factors have an important effect on student learning performance. This study explores the link between elevation opening percentage and space proportions in educational institutions. In order to assess daylight dispersal in a classroom in Lebanon that faced north—the direction required for the nation's best solar exposure—a quantitative approach utilizing modelling software was employed. The investigation looked at four various room dimensions with ratios of 1:1, 1:1.5, 1:2, and 1:3, as well as six different height opening percentages varied from 10% to 100%. The simulations additionally demonstrated that the proportion of windows open has a noteworthy effect on natural light dispersion, with larger percentages leading to more uniform light distribution. The 1:1.5 space proportion is the most effective classroom ratio based on the simulation results.