Ring Size Calculator

measuring for ring size at Home

Final Ring Size

- How to calculate ring size at Home:

Calculating your ring size can be done at home with simple tools or by using a professional ring sizer. Here are the most reliable methods:

  • 1. Using a String or Paper Strip

    • This method measures the circumference of your finger.

    • What you need:
      • A pen/marker.
      • A ruler (in millimeters).
      • Round to the nearest whole number.
  • 2. Calculate Ring Size
    • 1. Wrap the string/paper Wrap it around the base of the finger where the ring will sit. Make sure it's snug but not too tight.
    • 2. Mark the point Mark where the string or paper overlaps.
    • 3. Measure the length Lay the string or paper flat and measure the length in millimeters (mm).
    • 4. Find your size Use the measurement to find the ring size from the table below.

Ring Size (Diameter) Conversion Chart

Ring Diameter (MM) USA/Canada United Kingdom France Germany Japan Switzerland
14.0 mm. 3 F 44 14 4 4
14.4 mm. 3½ G 45¼ 14½ 5½ 6⅓
14.8 mm. 4 H½ 46½ 15 7 6½
15.2 mm. 4½ I½ 47¾ 15¼ 8 8
15.6 mm. 5 J½ 49 15¾ 9 9½
16.0 mm. 5½ L 50¾ 16 10½ 10¾
16.5 mm. 6 M 51½ 16½ 12 12¾
16.9 mm. 6½ N 52¾ 17 13 14
17.3 mm. 7 O 54 17¼ 14 15¼
17.7 mm. 7½ P 55¼ 17¾ 15 16½
18.2 mm. 8 Q 56¾ 18 16 17¾
18.6 mm. 8½ Q½ 58 18½ 17 18½
19.0 mm. 9 R½ 59¼ 19 18 20
19.4 mm. 9½ S½ 60¾ 19½ 19 21
19.8 mm. 10 T½ 61¾ 20 20 21¾
20.2 mm. 10½ U½ 62¾ 20¼ 22 22¾
20.6 mm. 11 V½ 64¼ 20¾ 23 24
21.0 mm. 11½ W½ 66 21 24 25¾
21.4 mm. 12 Y 67¼ 21¼ 25 27½
21.8 mm. 12½ Z 68 21¾ 26 28¾
22.2 mm. 13 Z + 1 69 22 27 29¼
22.6 mm. 13½ Z + 1.5 71 22.6 - 31

Ring Size (Circumference) Conversion Chart

Ring Circumference (MM) USA/Canada United Kingdom France Germany Japan Switzerland
43.96 mm. 3 F 44 14 4 4
45.21 mm. 3½ G 45¼ 14½ 5½ 6⅓
46.47 mm. 4 H½ 46½ 15 7 6½
47.72 mm. 4½ I½ 47¾ 15¼ 8 8
48.98 mm. 5 J½ 49 15¾ 9 9½
50.24 mm. 5½ L 50¾ 16 10½ 10¾
51.81 mm. 6 M 51½ 16½ 12 12¾
53.06 mm. 6½ N 52¾ 17 13 14
54.32 mm. 7 O 54 17¼ 14 15¼
55.57 mm. 7½ P 55¼ 17¾ 15 16½
57.14 mm. 8 Q 56¾ 18 16 17¾
58.40 mm. 8½ Q½ 58 18½ 17 18½
59.66 mm. 9 R½ 59¼ 19 18 20
60.91 mm. 9½ S½ 60¾ 19½ 19 21
62.17 mm. 10 T½ 61¾ 20 20 21¾
63.42 mm. 10½ U½ 62¾ 20¼ 22 22¾
64.68 mm. 11 V½ 64¼ 20¾ 23 24
65.94 mm. 11½ W½ 66 21 24 25¾
67.19 mm. 12 Y 67¼ 21¼ 25 27½
68.45 mm. 12½ Z 68 21¾ 26 28¾
69.70 mm. 13 Z + 1 69 22 27 29¼
70.96 mm. 13½ Z + 1.5 71 22.6 - 31