There are a couple of different ways to estimate your terminal length. One method is based on the taper of your ponytail and the other is based on your shedding rate
For the first method you put your hair in a low ponytail and put elastics around the length every 10-15 cm all the way down. Then you measure the distance from the first elastic at the neck to each of the elastics and plot it in on a graph. Now you measure the circumference of the ponytail on each of the elastics and plot that in too.
The points should give you a somewhat linear graph and if you do it by hand or a program you can extend it and estimate where the circumference reaches zero. This is your estimated terminal length using the taper calculations
Another method is that you take the estimated number of hairs on your scalp and divide it with your annual estimated shedding (Daily shedding x 365) that number is the number of years it will take for your scalp to have replaced all the hairs growing. Multiply this number with your annual growth (monthly growth x 12 or total growth as some people have higher growth in the summer) This is your estimated terminal length using the shedding calculations
The average number of hairs on your head:
80,000 for redheads
100,000 for brunettes/black hair
120,000 for blondes
Of course this will never be completely accurate because
You don’t know exactly how many hairs you have on your head
Some hairs have a longer growth cycle than others
Breakage and trims are not included
The shedding method will show a big difference if you add or subtract just 10 hairs
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