How to calculate psl

[luria]

How u calculate the psl like
If a guy I measured has such ratios what’s his psl

1.18 jaw width
1.40 fwhr
0,7 mid face ratio
1,07+- face height

I know it isn’t full but still if take only this
He might be like 2/8?

 

[dad]

doesn't work like that

 

[qxtwz7854]

0,7 mid face ratio

brutal