As you already know, laptop sizes aren't universal and depend upon the model and the manufacturer. However, the typical laptop sizes include 11.6inch / 29.46cm, 12.1inch / 30.73cm, 13.3inch / 33.78cm, 14inch / 35.56cm, 15inch / 38.1cm, 15.6inch / 39.62cm, and 17inch / 43.18cm.