Place a piece of clear tape across your natural nail. Do not do this over fake nails.
Press down at the creases and mark with a marker. This will give you the full curve width of your fingernail.
Remove the tape and place it along the cm/mm side of a ruler (not the inches side).
- Measure to the outer edge of each marker line for best results.
- In this example, the nail measures 12mm.
Repeat this process for each fingernail.