Panth

January 18th, 2015, 03:25 PM

It's hard to get a tape measure around the base of a ponytail and even when you try wrapping a piece of string then measuring that, it can be pretty tricky to measure your ponytail. I came up with this method:

1 ) Get some yarn - thicker stuff, as used for knitting, is best. It should be fairly strong (e.g. not single ply) and non-fuzzy.

2 ) Cut a length about 20" long.

3 ) Make a slip knot (https://www.youtube.com/watch?v=dENvo4huOe0), with each tails being at least 6" long.

4 ) Using a hairband, make a ponytail that contains all of your hair.

5 ) Slip the enlarged slip knot loop over your ponytail as if it was a hairband and place it above the hairband, between the hairband and scalp.

6 ) Tighten the slip knot loop as much as possible by pulling the relevant tail.

7 ) Secure the tightened slip knot by doing a "granny knot (https://www.youtube.com/watch?v=VZ3_Nf_4EOc)" or similar with the two tails.

8 ) Carefully, slide the hairband and the yarn off the ponytail. Curlies may need to very carefully cut the yarn off and therefore may need assistance for this bit.

9 ) Cut the slip knot loop once to open it, if you haven't already.

10 ) Measure the length of the slip knot loop, pulling it tight if the yarn is stretchy. This is your ponytail circumference.

Remember, ponytail area, not circumference is proportional to the amount of hairs you have. So, if using this to monitor hair loss, a halving in your circumference is generally considerably more than a halving in the number of hairs. (You can use pi to work this out. Circumference = pi*radius*2. Area = pi*squared radius.)

EDIT:: For the same reason, if you can't get all of your hair into one ponytail you can't just make two ponytails and add the circumferences together. You must calculate the area of each of the two ponytails, add that together, then calculate the circumference from the sum of the two areas. You can use an online calculator (http://math.about.com/library/blcirclecalculator.htm) to get area if you find that tricky. See comment #6 for a diagram of why.

EDIT2:: If your hair is curly, or if you otherwise find it difficult to slip the yarn loop off your ponytail, consider measuring a side ponytail. This way, you can use a mirror and clip the loop off yourself, without needing to rely on a helper.

1 ) Get some yarn - thicker stuff, as used for knitting, is best. It should be fairly strong (e.g. not single ply) and non-fuzzy.

2 ) Cut a length about 20" long.

3 ) Make a slip knot (https://www.youtube.com/watch?v=dENvo4huOe0), with each tails being at least 6" long.

4 ) Using a hairband, make a ponytail that contains all of your hair.

5 ) Slip the enlarged slip knot loop over your ponytail as if it was a hairband and place it above the hairband, between the hairband and scalp.

6 ) Tighten the slip knot loop as much as possible by pulling the relevant tail.

7 ) Secure the tightened slip knot by doing a "granny knot (https://www.youtube.com/watch?v=VZ3_Nf_4EOc)" or similar with the two tails.

8 ) Carefully, slide the hairband and the yarn off the ponytail. Curlies may need to very carefully cut the yarn off and therefore may need assistance for this bit.

9 ) Cut the slip knot loop once to open it, if you haven't already.

10 ) Measure the length of the slip knot loop, pulling it tight if the yarn is stretchy. This is your ponytail circumference.

Remember, ponytail area, not circumference is proportional to the amount of hairs you have. So, if using this to monitor hair loss, a halving in your circumference is generally considerably more than a halving in the number of hairs. (You can use pi to work this out. Circumference = pi*radius*2. Area = pi*squared radius.)

EDIT:: For the same reason, if you can't get all of your hair into one ponytail you can't just make two ponytails and add the circumferences together. You must calculate the area of each of the two ponytails, add that together, then calculate the circumference from the sum of the two areas. You can use an online calculator (http://math.about.com/library/blcirclecalculator.htm) to get area if you find that tricky. See comment #6 for a diagram of why.

EDIT2:: If your hair is curly, or if you otherwise find it difficult to slip the yarn loop off your ponytail, consider measuring a side ponytail. This way, you can use a mirror and clip the loop off yourself, without needing to rely on a helper.