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How To Measure The Longest Hair Ratio By Yourself?

Nov 29,2025 | Lyric Ying

The longest hair ratio refers to the percentage of hair strands in a bundle that are of a specified length.

The larger the ratio,the thicker the hair bundle is.

We can actually measure the longest hair ratio by ourselves.

Here is a simple method.

There is a bundle in the picture,the bundle is 18inch,and it can be measured to 20inch.

And let’s measure the longest hair ratio of 18inch.

So the measurement method is as below

Wrap the string around the upper place of the bundle,and record the string’s length

Then wrap the string around the 18inch place of the bundle,and record the string’s length

the second number divided by the first number is the hair ratio of 18inch.

So this is the number we get.

Upper Place 9cm
Lower Place 4cm
Ratio 0.44

So the hair ratio of 18inch of this bundle is 44%.

I learned this measurement method from a worker who works for the human hair factory.

And you can use this way to measure the hair bundle ratio by yourself.

Hope this tip will help you.

Thank you for your reading!

 

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