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i12sitonmyhair said:
I use a tape measure (that would go around your waist or arm or something) and pick some sample strands on different parts of my head. I hold one end of the tape at the root of those strands and stretch my hair along the tape until I reach my ends. Since my hair is natural, and I don't get trims anymore, my hair length varies from one part of my head to another. I'm just measuring once a month (like on the 3rd of every month). It shouldn't matter if it's right before or after your touch-up unless you got a trim. HTH
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This is a great way to measure. I usually do this after my relaxer along with a few more variations. I always measure the same areas (front right, front left, side right, etc.)and I use a ruler (this way I can make sure it is stretched on a hard surface, which makes it more accurate. I relax every 3 to 4 months so that is when I make notes to the changes (including trims.)
As you chart your progress, it keeps you motivated.