Choose how long they are

Unfortunately, you cannot simply decide how long you would like your lash extensions to be; you have to take into account your own lashes. You can only carry the length of extension lashes that can be supported by your natural lashes. That’s partly a question of the weight of the extension lashes – because extra length equals extra weight – but it’s also partly a question of the strength, length and thickness of your natural lashes to which the extensions would be attached. It is a similar issue to the question of how wide your extension lashes should be.

Rules to guide your choice

These are some rules of thumb which practitioners use:

  • The extension lash should be no more than 1/3 longer than the natural lash it will be attached to
  • If the aim is to achieve a natural look, the extension lash should be no more than 1mm to 2mm longer than the natural lash it will be attached to.
  • If the aim is to achieve a dramatic look, the extension lash should be no more than 3mm to 4mm longer than the natural lash it will be attached to.
  • It is usually recommended to stay within 7mm to 12mm, but someone with exceptionally long natural eyelashes may be able to go higher.
  • Lower eyelids are not particularly suitable for extensions, but they need to be kept within the range of 3mm to 5mm.

Typical lash extension lengths

These are some commonly found lengths of extension lashes, with recommendations for their use.

3mm – 5mm Extra short Only for lower lash extensions
6mm – 9mm Short For the inside corner of the eyelid
10mm – 11mm Medium For the main part of the eyelid
12mm Long For naturally long eyelashes or for effect
13mm + Extra long Only for particularly long natural eyelashes or for special occasions

Using a mixture of lengths

If you have your extensions all just one length, you would look like a doll. To achieve a natural and seamless look, it is necessary to have a variety of lengths. However, adjoining areas should only increase and decrease in length by 1 mm.

For example, the length of your extensions lashes could increase from 6mm at the inner part of your eye, and then increase to 7mm, 8mm, 9mm, and 10mm, before falling back to 9mm for the very outer corner of the eye. But if it had to fall back to 8mm for the outer corner, it would be necessary for the step down from 10mm, to be 9mm first, and finally 8mm.

What you need to avoid is going up or down two sizes at a time, because that will create an odd-looking jagged look between the different levels.