💍 Ring Size Conversion Guide

If you already know your ring size but use a different sizing system than Belgium’s (ISO 8653:2016, which defines ring size by internal circumference), you can use the table below to convert your size.

For accuracy, we also recommend cross-checking by measuring the internal diameter or internal circumference of a well-fitting ring.

📏 How to Measure

  • Internal Diameter (mm): Measure the distance across the inside of the ring.

  • Internal Circumference (mm): Measure around the inside edge of the ring.

  • Match your measurement with the table to find your size in different international standards.

Ring Size Conversion Table

RING DIAMETER(MM)

INNER CIRCUMFERENCE (MM)

BELGIUM/ FRANCE/ SCANDINAVIA/ AUSTRIA/ OTHER EUROPEAN

ITALY/ SPAIN/ NETHERLANDS/ SWITZERLAND

GERMANY/ BALTIC COUNTRIES

USA / CANADA

UNITED KINGDOM

ASIA

14

46

46

6

14.6

–

3 3/4

-

–

46.8

46.8

6.8

14.9

4

-

7

14.9

47

47

7

15

-

-

-

15.3

48

48

8

15.3

4.5

-

8

15.6

49

9

15.6

-

-

-

-

49.3

49.3

-

-

5

9

15.9

50

50

10

15.9

-

-

-

50.6

HOW TO FIND YOUR RING SIZE

It is best if you can measure your ring size at a jeweler’s but if this is not possible, please follow the instructions below to measure your finger.

  1. Use a strip of paper  app the width of an average  ring band (approximately 4- 6 mm).
  2. Wrap it around your finger at the spot you put the the ring.
  3. Mark the point on the paper where it overlaps.
  4. With a ruler measure the length. This number is the internal circumference of the ring.

We recommend cross referencing this measurement with the measurement of an existing ring or a measurement you have received from a jeweler.

Download Ring Size Guide