What's the number of hairs needed for maximum thickness in a philtrum hair transplant?

See a doctor for a number of graft recommendation. It's rather hard to do without even a photo.  If you are striving for maximum density, you probably will need two surgeries despite the number you are trying to figure out.  This is what a doctor needs to explain to you in person.Focus on the RESULTS.  Not the number.

To calculate the number of hair and maximize, i would have to know the size of the area being transplanted and the conditions of the area being transplanted

To gent an estimate for the number of grafts needed for an. Area, I suggest that you submit a picture for an online evaluation. Without a picture, it is impossible to give an estimate.

Although the cupids bow or philtrum has hairs, the density should be less than that of the entire mustache. I need to see the picture of your mustache to comment. I would make the density half the density of the adjacent mustache hairs.