Measuring your hair is also a good way to see if any changes made in your haircare routine or diet have affected your hair’s growth rate. It is important that you get an accurate measurement each time you measure. I recommend measuring once a month, on the same day of each month. It is best to do your first measurement right after a trim. So if you know you have one coming up soon, wait until after it to begin keeping records. 
 

   Before you start you need these items:
1. A note book
2. A tailor’s or cloth tape measure

   In measuring your hair’s growth, it is vital that you get an accurate measurement each time you measure. This is why you need to start measuring from your hairline were your forehead ends and your hair begins, right in the center, where a middle part would begin. If you try measuring from other areas of your scalp, the chances of your getting the tape in the exact same spot of your scalp each time you measure are against you. Since your hairline does not move, you will have the same starting point each time you measure.

   Let both your hair and measuring tape fall behind you along the line of where a middle part would be. The measuring tape needs to be in the middle of your back. Whether your hair is all one length or layered, measure to the end of your longest strands. As shown in the photo below. 

   It may be impossible to read your hair measurement from the mirror. So while still holding the beginning of the tape measure on your hairline, feel for the spot where your hair ends. Grab the tape measure one or two inches above that spot, using your thumb and fingers as shown below. Please make sure that your hair and tape measure are both perfectly straight when you grasp the spot. Once you have the exact spot on the tape measure grasped, you can let go of the beginning of the tape measure. Now simply pull it around for a quickreading. As shown in the photo below. 

  After 6 months of measuring, take an average, and multiply it by 2. The resulting number will be pretty close to how long your hair grows in one year. Remember that in warmer climates, hair grows faster. So if you live in an area that has major climate changes with the seasons, you will see more growth during summer than during winter. If you keep a hair journal to track your hair improvements, then you can record your measurements in the journal. Remember to measure and record your hair's length each month. 

  If you hair is layered or you are growing out your bangs, you can measure them separately. You will probably find that different lengths grow at different rates. If you do this, record and label each length. And do not forget to date all measurements.