Hi @eurasianbeauty I love your instagram b&a's! Here is a link to a golden ratio calculator https://facethis.blogspot.co.uk/2012/01/perfect-face-golden-ratio-beauty.html @kitty nyc 13 cms can be perfect. Just need to measure the height of your head too. If it is 21 cms you are perfect at 1.61. My face height is 20 cms but use the head length for the golden ratio. For me, my head length is 24.5 cms so combined with a width of 15.5 actually gives me a ratio of 1.58. This means I must wear my hair flat on the sides so as not to add more width and keep volume on the top of my head. A small korean face is only 17 cms in height! But do not use the face length for the golden ratio or you will need a face width of 10.55 cms! And that is humanly impossible.