Print this PDF at 100% scale (not scale to fit page). Doublecheck that the line on the right reads 1” before proceeding. Find a ring that fits your desired finger, preferably one with a fully flat interior. The correct ring size will meet the inside perimeter of your ring. If the ring falls between two sizes, select the larger size. Alternative method: take a piece of taught string (little elasticity), wrap that around desired finger, and use end-to-end length to compare with corresponding inner circumferences on this sheet. If you’re still unsure, email firstname.lastname@example.org.