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Lash Extension Sizes Guide-Thickness and Length

Table of Contents

It is very critical for clients to take consideration of the curl, and length, as well as thickness before choosing the right diameter of the eyelash extensions. Because they will dramatically change the overall look of your eyes and effect your lash extensions retention or longevity.

This article will delves into the topic sizes chart about length, and thickness, particularly those used in salons for the lash pros. Read it to understand these concepts.

Eyelash Extension Thicknesses Range:

Eyelash extension thicknesses are the eyelash extension diameters, their range are from .03mm to .30mm to suit everyone’s natural lashes, glamorize your eyes, and without damaging your natural lashes.

So it is important to choose the right diameter of eyelash extensions and the condition of your client’s natural lashes. Keeping in mind although thickness eyelash extension can create a glamorous looking, it could cause poor retention and fall off.

Eyelash Extension Thickness Chart:

Lash Thickness
Lash Thickness Chart

.03mm, .05mm and .07mm Extremely thin and extremely lightweight and used mostly for mega volume & Russian volume lashes, or to fill in gaps, and used on very thin/very fine natural lashes.

.10mm This thickness can also be used for Volume 2D (depending on the natural lash thickness and length) or as classic lashes on thinner very fine natural lashes.

.12mm Used on thinner lashes (classic lashes) or for a softer wispier look and feel.

.15mm This is the average lash thickness, creates a natural thicker look (classic lashes).

.20mm This lash extension thickness creates a natural mascara look.

.25mm Creates a more striking glamorous look, this lash may be too heavy for most people’s lashes.

.30mm For healthy, strong, thick natural lashes. Creates an extreme look–again, may be too heavy for most people’s lashes.

What is the best thickness for eyelash extensions? The answer is .07mm. A wrong choice could cause poor retention and premature falling off of the extensions.

If you are unsure about the thickness of your client’s natural lash, compare with your lash extensions (which are labeled with the thickness) to determine the rough diameter of the natural lash.

When deciding the thickness, you should not only consider the design aspect but, more importantly, the condition of your client’s natural lashes.

The thickness that works best for the classic look is 0.12mm, 0.15mm, 0.18mm, 0.20mm, and 0.25mm. However, lash extensions with a thickness of 0.15mm stand out as the most popular option, as it leaves a naturally thick look that complements the classic set of lashes. 0.20mm is the second most popular thickness, though it’s best to apply this on thick and healthy natural lashes.

Generally, the natural eyelashes of Asians are thinner than those of other ethnicities. Also, you’ll notice that with clients over the age of 50 their eyelashes are thinner than your younger clients.

For these clients, it is recommended to use lash extensions of diameter between 0.10-0.15mm, whereas other clients with stronger natural lashes can take 0.15-0.20mm.

However, regardless of the ethnicity or age of your client, you should always take a good look at the client’s natural lashes and decide what thickness is suitable for them.

Eyelash Extension Lengths Chart:

Lash Length
Lash Length Chart

Generally speaking, shorter extensions of 5-9mm are used for inner corners or under eyelash extensions, and 9-13mm extensions are used for the majority of the set.

Some artists mix longer lengths from 14mm or longer lashes to create a Hybrid volume effect.

How to Choose the Right Lash Lengths

Most clients want the longest lashes, but the long natural lash extensions do no mean perfect eyelashes, you must keep in mind that the individual client’s lash condition should determine the length of the extension. Of course, the majority of clients want their longest extension length to be around 12mm or 13mm. Longer is not always better, using lashes 14 mm or longer are not always ideal unless you already have strong, long natural lashes to begin with, or they may cause premature falling out of the extensions.

Here’s a video on what’s the eyelash extension length, thickness:

So it is important to keep in mind that the length of your natural lash, the density of your natural lash, your lifestyle and how you care for your extensions all play a major role in the safety of your natural lashes and longevity of the eyelash extensions. It is recommended that you start with the least amount of length to get the best results as far and longevity for your extensions and to preserve the integrity your natural lashes.


So it’s not as easy as simply deciding whether you want short, long, or in-between lashes, you should know techniques that would give you the length you wish for as well as keeping them healthy.

Yiernuo lashes offers a wide range of eyelash extensions with varying thicknesses, lengths and curls to suit your unique market demands. Talk to our expert consultants and experience next-level products and service that only Yiernuo can deliver.


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