First of all, I would recommend measuring your finger couple of times during the day to compare and choose the average value because the size may vary depending on temperature. It is better to measure your finger in the evening because usually it is less swollen.
The ring should fit you comfortably; It should be snug enough not to fall off but loose enough to slide over your knuckle. If you’re between sizes, always go up; it’s easier to work with a ring that’s too big than it is to get a stuck ring removed.

Option 1: Use string (or floss) to measure your finger

  • Take a length of string and wrap it around the base of your finger. Make sure the string isn’t too tight.
  • Mark where the string overlaps.
  • Remove the string and straighten it out along a ruler or measuring tape, and take down the length in millimeters. You now have the circumference of your finger. Now it´s time to calculate the diameter.

How to calculate a diameter?
Diameter = Circumference ÷ π
Example: My finger´s circumference is 56mm
56 ÷ 3.14 = 17.8
According to the ring size chart my size is 16.

And if you’re between sizes, always size up.

  • Use the size guide below to compare your measurement to the standard ring sizes.

Ring size guide

Option 2: Use an existing ring

  • Find a ring that fits you well.
  • Grab a ruler and measure the diameter of the ring (its widest part) in mm.
  • Find the diameter on our ring size conversion chart to get the approximate ring size.

Ring size guide

Important: The width of the ring affects the size. The wider a ring is, the larger it needs to be to fit because such jewelry sits tighter, besides, fingers can slightly increase due to various reasons (in the evening, due to heat, etc.).
For example, if the diameter of your finger is 16.8 mm (size 13) and you want a wide ring then you should opt for size 13 ½.

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