How do u exactly come up with a number for facial ratio analysis?

[dimorph.ic]

I can measure things pretty good angles and such but i dont get how people get a number like 70% harmony or like 7.6/10 side profile or some shit is it just off guess?

 

[Mystericus]

By measuring the ratios & quantifying them?

 

[dimorph.ic]

By measuring the ratios & quantifying them?

How so i see people put things like t1-t2-t3-t4 but i dont get how this makes a number

 

[Mystericus]

How so i see people put things like t1-t2-t3-t4 but i dont get how this makes a number

Assuming it means tier, I'm not a measurecel