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Mayors Guide

How To Measure Your Ring Size

Before you buy your forever ring, we recommend that you check your ring size. If you are unable to visit your nearest Mayors showroom where our experts can do this for you, the below gives guidance on a choice of two methods to use at home.

Measure a Finger
Measure a Ring
Measure Your Finger Step One

Step One

Decide which is the largest finger on which you will wear your ring. Using a narrow strip of paper, wrap it around the base of this finger.

Measure Your Finger Step 2

Step Two

Ensure the paper has a tight fit to gain the most accurate result. Using a fine tip pen, clearly mark where the end of the paper meets the rest of the strip.

Measure your finger Step 3

Step Three

Measure the length of paper to the point you have marked. This measurement is the circumference of your finger.

Diameter - Step 1

Step One

Choose a ring that fits your chosen finger comfortably.

Diameter - Step 2

Step Two

Lay the ring on top of a tape measure and measure the widest point of the ring, from each inner edge. Round up to the nearest millimeter.

Diameter - Step 3

Step Three

This measurement gives you the ring diameter. Use the ring size chart to determine your size by matching it to your ring diameter.

Find Your Ring Size Chart

Here at Mayors, our rings are specified in standard US sizing. For your convenience, we have also included the conversions to British, European and Chinese brand sizing, to ensure that you choose the perfect fit for you.

Circumference
Inside Diameter
Circumference Ring Size
(mm) US UK Europe China
37.8mm 1.5 A - -
39.1mm 1 B - -
40.4mm 1.5 C - -
41.7mm 2 D 41 1/2 -
42.9mm 2.5 E 42 3/4 -
44.2mm 3 F 44 -
45.5mm 3.5 G 45 1/4 5
46.8mm 4 H 46 1/2 7
48.0mm 4.5 I 47 3/4 8
50.0mm 5 J 1/2 49 9
50.1mm 5.5 K 1/2 50 1/4 10
51.9mm 6 L 1/2 51 1/2 11
53.1mm 6.5 - 52 3/4 -
54.5mm 7 - 54 -
55.8mm 7.5 O 1/2 55 1/4 17
57.2mm 8 - 56 1/2 18
58.4mm 8.5 Q 1/2 57.75 19
59.6mm 9 R 1/2 59 20
61.0mm 9.5 - 60 1/4 21
62.3mm 10 U 61 1/2 23
63.5mm 10.5 - 62.75 24
65.0mm 11 W 64 25
66.2mm 11.5 X 65 1/4 26
67.5mm 12 Y 66 1/2 27
68.7mm 12.5 Z 67 3/4 28
Circumference
(mm)
37.8mm
39.1mm
40.4mm
41.7mm
42.9mm
44.2mm
45.5mm
46.8mm
48.0mm
50.0mm
50.1mm
51.9mm
53.1mm
54.5mm
55.8mm
57.2mm
58.4mm
59.6mm
61.0mm
62.3mm
63.5mm
65.0mm
66.2mm
67.5mm
68.7mm

Show More Sizes

Show Less Sizes

Inside Diameter Ring Size
(mm) UK US Europe China
11.9mm 0.5 A - -
12.3mm 1 B - -
12.7mm 1.5 C - -
13.1mm 2 D 41 1/2 -
13.5mm 2.5 E 42 3/4 -
14.0mm 3 F 44 -
14.5mm 3.5 G 45 1/4 5
14.8mm 4 H 46 1/2 7
15.2mm 4.5 I 47 3/4 8
15.7mm 5 J 1/2 49 9
16.1mm 5.5 K 1/2 50 1/4 10
16.5mm 6 L 1/2 51 1/2 11
17.0mm 6.5 - 52 3/4 -
17.4mm 7 - 54 -
17.8mm 7.5 O 1/2 55 1/4 17
18.2mm 8 - 56 1/2 18
18.6mm 8.5 Q 1/2 57 3/4 19
19.0mm 9 R 1/2 59 20
19.4mm 9.5 - 60 1/4 21
19.8mm 10 U 61 1/2 23
20.3mm 10.5 - 62 3/4 24
20.7mm 11 W 64 25
21.1mm 11.5 X 65 1/4 26
21.5mm 12 Y 66 1/2 27
21.9mm 12.5 Z 67 3/4 28
Inside Diameter
(mm)
11.9mm
12.3mm
12.7mm
13.1mm
13.5mm
14.0mm
14.5mm
14.8mm
15.2mm
15.7mm
16.1mm
16.5mm
17.0mm
17.4mm
17.8mm
18.2mm
18.6mm
19.0mm
19.4mm
19.8mm
20.3mm
20.7mm
21.1mm
21.5mm
21.9mm

Show More Sizes

Show Less Sizes

Circumference Inside Diameter Ring Size
(mm) (mm) US UK Europe China
37.8mm 11.9mm 0.5 A - -
39.1mm 12.3mm 1 B - -
40.4mm 12.3mm 1.5 C - -
41.7mm 13.1mm 2 D 41 1/2 -
42.9mm 13.5mm 2.5 E 42 3/4 -
44.2mm 14.0mm 3 F 44 -
45.5mm 14.5mm 3.5 G 45 1/4 5
46.8mm 14.8mm 4 H 46 1/2 7
48.0mm 15.2mm 4.5 I 47 3/4 8
50.0mm 15.7mm 5 J 1/2 49 9
50.1mm 16.1mm 5.5 K 1/2 50 1/4 10
51.9mm 16.5mm 6 L 1/2 51 1/2 11
53.1mm 17mm 6.5 - 52 3/4 -
54.5mm 17.4mm 7 54 -
55.8mm 17.8mm 7.5 O 1/2 55 1/4 17
57.2mm 18.2mm 8 - 56 1/2 18
58.4mm 18.6mm 8.5 Q 1/2 57 3/4 19
59.6mm 19.0mm 9 R 1/2 59 20
61.0mm 19.4mm 9.5 - 60 1/4 21
62.3mm 19.8mm 10 U 61 1/2 23
63.5mm 20.3mm 10.5 - 62.75 24
65.0mm 20.7mm 11 W 64 25
66.2mm 21.1mm 11.5 X 65 1/4 26
67.5mm 21.5mm 12 Y 66 1/2 27
68.7mm 21.9mm 12.5 Z 67 3/4 28

Show More Sizes

Show Less Sizes

Measuring Tips

  • • The best time of day to measure your ring size is in the evening, when your fingers are largest. Avoid measuring when you’re cold, as fingers are at least half a size smaller.
  • • When measuring your finger or ring, always round up to the nearest millimeter.
  • • The thicker the ring, the tighter the fit, so if you choose a ring with a deep band width, you will likely need to go up one size.
  • • If you are considering a stackable ring, you may desire a looser fit, in which case we recommend you choose one size up from your measured ring size.
ring measuring tips
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