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

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.

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.

Step Three

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

Step One

Choose a ring that fits your chosen finger comfortably.

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.

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

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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

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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.