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The Tape & Ruler Method This is the most common DIY method. You’ll be measuring the width of your nail bed at its widest point. 1. Place a piece of clear tape across the widest part of your natural nail, pressing down to ensure it follows the curve. 2. Mark the edges of your nail (from sidewall to sidewall) using a fine-tip pen or marker. 3. Remove the tape and lay it flat against a ruler. 4. Count the millimeters (mm) between the two marks. 5. Repeat for all ten fingers, as sizes can vary between hands! Between Sizes? Always size up. You can gently file the sides of a larger press-on to make it fit perfectly, but a nail that is too small will pop off easily.