You have two options for finding the correct nail size, you may measure your nail beds using measuring tape. It is highly recommended that you use the millimeter side of the measuring tape for accurate measurements. Please do not use a ruler. To measure, center the measuring tape in the middle of your nail bed, width wise, and measure from sidewall to sidewall. For additonal assistance, please refer to our "Nail size chart" section on our site. If measuring tape is not available, we offer a nail size kit, in multiple shapes and lengths.