A close-up image of a mercury thermometer lying on a white surface.

How to Measure Your Ring Size

At Cióió, ring sizes are measured based on the rings inner circumference in millimeters. For example, a size 54 ring corresponds to a 54 mm circumference.

If you don’t already know your ring size, you can easily measure it yourself. Keep in mind that finger size can change throughout the day and is affected by temperature fingers tend to be smaller when cold and larger when warm. To ensure the most accurate measurement, measure your finger when it is at a normal temperature.

  • If you already own a ring that fits the desired finger, you can also determine your size by measuring its inner diameter:

    1. Place the ring on a ruler or measuring tape.

    2. Measure the inner diameter from side to side in millimeters.

    3. Compare the measurement with our sizing guide to find your corresponding ring size.

  • Use a piece of string or a strip of paper and wrap it around the finger where you plan to wear the ring.

    1. Mark the point where the string or paper meets when it fits comfortably.
    2. Lay the string or paper flat and measure the marked section in millimeters.
    3. The measurement corresponds to your ring size.

Table showing finger circumference in millimeters, inner diameter of the ring in millimeters, and US/UK, EU, and Cíòó sizes for rings.

If you’re unsure about your size, reach out <3