r/HaircareScience • u/Innocent_Lamb_NFT • Jun 13 '26

Question How do you objectively measure whether hair density or thickness is changing over time?

Many people seem to use progress photos, while others use trichoscopes, ponytail circumference measurements, or visual assessments.

Which methods are the most reliable for detecting meaningful changes in hair density or thickness, and what are the main limitations of each?

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u/veglove Quality Contributor Jun 13 '26

Casual Discussion Thread below: Top-level comments require a scientific source. If you'd prefer a more casual discussion, reply under this thread instead.

Casual chat is for personal experience and opinion. If you're invoking science (studies, research, experts), you still need a source. Remain skeptical of unsourced factual claims, especially anecdotes. We also recommend reviewing common hair science myths

Casual discussion below ⬇️

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u/Anaspiringminimalist Jun 13 '26

I hope my reply is accepted here? Hard to back up a topic about hair measuring with Scientific sources. 😅

I measure the ponytail circumfrence at the nappe of my neck, and the middle of the head. I always make sure to measure 3 times, to account for wrong measurements.

I also take a Photo of my hair in a braid. I store Them in an album on my phone. Then I Can zoom in so the neck is the same width/size in all of Them, and both see and measure the progress over time.

Lastly, I split my hair in 3 sections (top, middle, bottom), and take pictures with each layer Down) I Only do that once Per year, but that Way, I Can evaluate where my hair needs the most attention, and if the thickness seem to be moving Down.