Print a Paper Ring
Before you sit down to measure your ring size, there are a few how-to pointers you should keep in mind:
Consider your knuckle. If you know your knuckle is on the larger side, you should order half a size bigger than what your finger alone indicates, otherwise, you won’t be able to slide a ring into the right place.
Ensure accuracy with multiple tries. Catbird’s site recommends measuring your finger three to four different times because the size actually fluctuates depending on temperature: It can be smaller the colder you are and more swollen if you’re overheated.
You can print out this ring sizer from your computer at home. When printing the guide, make sure your print scale is set to 100 percent and the “fit to page” box is left unchecked in order to get an accurate measurement from the printout. Place the ring on the circles of this easy-to-use Ring Sizing Guide until you find the size that matches, or cut out the pre-measured strip of paper and use it to measure your finger.