Option 1: Purchase a sizing kit

A sizing kit includes every nail size in a shape of your choice to try on and determine your size. Once you know your sizes correspond those with the standard sizes. If none of the standard sizes fit your nail measurements order a custom size.

Option 2: Measure your nails

Step 1: Put a piece of tape over your nail Mark lines where the tape meets the side walls of your nail bed. Pull the piece of tape off and use a soft measuring tape to measure from one mark to the other one on the tape. USE MILLIMETERS.

or

lay a soft measuring tape over the widest part of your nail bed, pulling down to account for the curve of your nail bed. Note the width of your nail in millimeters for each finger.

Step 2: Now that you know the width of your nails in millimeters, use the chart below to determine your nail numbers and the corresponding size.