Before you sit down to measure your ring size, there are a few how-to pointers you should keep in mind:

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• 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 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 measure your ring size using a piece of jewelry that you already have and know fits you. Print out a true-to-size ring size chart—like this one from Catbird—and place your ring on the circles until you find the one that matches up with the inside circumference of your ring.