Measuring Tape:

Please use a soft measuring tape for the most accurate measuring.
Place transparent tape over the length and curve of your nail bed.
Press down to form a crease on each side of your nail. Using a pen, mark the widest part of each side of your nail. That way the measuring tape follows the curve of the nail.
Repeat the process for all 10 nails.
Remove tape from each finger and use a soft measuring tape and measure in MM.
Using the sizing chart above, find your size. Example: if you measure your thumb at 14MM, your nail is a size 3.
Write down your sizes, from thumb to pinkie. Compare to sizing chart.
If your sizes do not match XS-Large, then you are a 'custom' size. You will select 'custom' in the sizing drop down menu, and write your sizes in the custom box.

Sizing Kit.

A sizing kit is the only way to guarantee your perfect fit. You will purchase a $5 sizing kit. In the mail you will receive a card with 10 nail tips, one of each size 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.
You will grab each nail and hold it up to each finger until you find what sizes fit each nail perfectly.

Replacement Nail.