Ring Sizing

Find your ring size.

Not sure? Use a ring you already own, or measure with a string. If the size is off, you are covered: 30-day exchange on unengraved rings, and Lifetime Sizing for the original purchaser after that.

Find Your Size at Home See How to Measure
Already know your size? Use the chart below →
Three Ways to Find Your Size

Pick the path that fits.

01
Use a Ring You Own
Most accurate. Measure the inside diameter of a ring that already fits.
Show method →
02
Measure at Home
String and a ruler. Takes about two minutes.
Show me how →
03
Convert a Size
If you already know your UK, EU, or Japan size.
See chart →
How to Measure

Two methods, both accurate.

Method A: Use a ring you already own

01
Find a ring that already fits the correct finger comfortably.
02
Place the ring on paper and trace the inside circle.
03
Measure the inside diameter across the widest point. Match it to the chart below.

Method B: String and a ruler

01
Wrap a string snug at the base of the finger.
02
Mark the spot where the string overlaps.
03
Measure the marked length. Match the circumference to the chart.

A few notes from the workshop

  • Measure at the end of the day. Fingers are larger by then.
  • Measure the hand the ring will live on. The dominant hand is usually a half-size larger.
  • A wider band (6mm+) wears a half-size tighter. If between two sizes, size up.

Prefer a guided tool? Use the interactive ring sizer.

Use the Interactive Ring Sizer
International Conversion

Find your size by region.

US Size Diameter (in) Circumference (in) Diameter (mm)
4 0.586 1.84 14.88
4½ 0.602 1.89 15.29
5 0.618 1.94 15.70
5½ 0.634 1.99 16.10
6 0.650 2.04 16.51
6½ 0.666 2.09 16.92
7 0.682 2.14 17.32
7½ 0.698 2.19 17.73
8 0.714 2.24 18.14
8½ 0.730 2.29 18.54
9 0.746 2.34 18.95
9½ 0.762 2.39 19.36
10 0.778 2.44 19.76
10½ 0.794 2.49 20.17
11 0.810 2.54 20.57
11½ 0.826 2.59 20.98
12 0.842 2.65 21.39
12½ 0.858 2.70 21.79
13 0.874 2.75 22.20
13½ 0.890 2.80 22.61
14 0.906 2.85 23.01
14½ 0.922 2.90 23.42
15 0.938 2.95 23.83
US UK / Australia / NZ Diameter (mm)
4 H 14.88
4½ I 15.29
5 J ½ 15.70
5½ K 16.10
6 L ½ 16.51
6½ M 16.92
7 N ½ 17.32
7½ O 17.73
8 P ½ 18.14
8½ Q 18.54
9 R ½ 18.95
9½ S 19.36
10 T ½ 19.76
10½ U 20.17
11 V ½ 20.57
11½ W 20.98
12 X ½ 21.39
12½ Y 21.79
13 Z ½ 22.20
13½ Z + 1 22.61
14 Z + 2 23.01
14½ Z + 3 23.42
15 Z + 4 23.83
US Germany / France Switzerland Diameter (mm)
4 46.5 6.5 14.88
4½ 48.0 8.0 15.29
5 49.3 9.3 15.70
5½ 50.6 10.6 16.10
6 51.9 11.9 16.51
6½ 53.1 13.1 16.92
7 54.4 14.4 17.32
7½ 55.7 15.7 17.73
8 57.0 17.0 18.14
8½ 58.2 18.2 18.54
9 59.5 19.5 18.95
9½ 60.8 20.8 19.36
10 62.1 22.1 19.76
10½ 63.4 23.4 20.17
11 64.6 24.6 20.57
11½ 65.9 25.9 20.98
12 67.2 27.2 21.39
12½ 68.5 28.5 21.79
13 69.7 29.7 22.20
13½ 71.0 31.0 22.61
14 72.3 32.3 23.01
14½ 73.6 33.6 23.42
15 74.8 34.8 23.83

Germany and France use ring circumference in millimeters. Switzerland uses circumference minus 40.

US Japan Diameter (mm)
4 7 14.88
4½ 8 15.29
5 9 15.70
5½ 10 16.10
6 12 16.51
6½ 13 16.92
7 14 17.32
7½ 15 17.73
8 16 18.14
8½ 17 18.54
9 18 18.95
9½ 19 19.36
10 20 19.76
10½ 21 20.17
11 22 20.57
11½ 23 20.98
12 25 21.39
12½ 26 21.79
13 27 22.20
13½ 28 22.61
14 29 23.01
14½ 30 23.42
15 31 23.83
Exchanges, Sizing & Warranty

If your size is off, you are covered.

30-day exchange. Unengraved standard rings exchange free within 30 days. Engraved rings are exchange-only with a $34.50 surcharge.

Lifetime Sizing. Fit changes after 30 days are covered for the original purchaser at a small flat fee, with no time limit.

Aydins Lifetime Warranty. Manufacturing defects are covered free for the first 6 months, then $34.50 through month 12, then $54.50 flat after that.

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