1. Place a piece of tape over the widest part of your nail. Make sure to press down for a more accurate measurement of your nail curvature.
2. Mark the sides of your nail on the piece of tape.
3. Take the tape off and measure the length between the marks with a ruler.
4. Use the sizing chart to match your measurements with a nail number and determine which standardized size you are. Again, you may select a custom size and leave your measurements in the instruction box at checkout if you wish.