Ring Size Guide (International Conversion & How-to)

Getting the right size is essential. Below are three easy measuring methods plus a handy US size chart (diameter & circumference) to help you find your perfect fit.

1) Three Measuring Methods

• Paper/String Method (most common)

  1. Wrap a thin strip around your finger and mark the overlap; 2) Measure the length with a ruler (circumference); 3) Match the value to the chart below.
     Tip: Measure during your usual wear time (fingers are slightly larger in the evening).

• Existing Ring Method
  Measure the inner diameter of a ring that fits well (mm) and refer to the chart.

• Printable Sizer (optional)
  Use a printed ring sizer to compare or test by holes.

2) US Size Chart (Common 5–13)

Inner diameter (MM)	Circumference (MM)	US / Canada	UK / Australia / South Africa	France / Germany (EU)	Italy	Spain
15.70	49.3	5	J½	49	9.5	9.5
16.11	50.6	5.5	K½	51	10.5	10.5
16.52	51.9	6	L½	52	12.0	12.0
16.93	53.2	6.5	M½	53	13.0	13.0
17.34	54.5	7	N½	54	14.5	14.5
17.75	55.7	7.5	O½	56	16.0	16.0
18.16	57.0	8	P½	57	17.0	17.0
18.57	58.3	8.5	Q½	58	18.0	18.0
18.98	59.6	9	R½	60	20.0	20.0
19.39	60.9	9.5	S½	61	21.0	21.0
19.80	62.2	10	T½	62	22.0	22.0
20.21	63.4	10.5	U½	63	23.0	23.0
20.62	64.7	11	V½	65	25.0	25.0
21.03	66.0	11.5	W½	66	26.0	26.0
21.44	67.3	12	Y	67	27.0	27.0
21.85	68.6	12.5	Z	69	29.0	29.0
22.26	69.9	13	Z+1	70	30.0	30.0

Note: Circumference ≈ Diameter × π (3.1416). Values are commonly used references.

3) Picking the Best Fit

• Prominent knuckle: choose a size that slides over the knuckle but doesn’t spin;

• Wide bands: often half-size up feels better;

• Temperature effect: fingers are tighter in summer, looser in winter—evening measurements are more realistic.

4) FAQs

• Slightly loose? Use a silicone ring adjuster or get minor resizing for silver/gold bands.

• Buying a gift? Choose adjustable or open-shank designs.

Explore & Shop

• Rings →https://rosemorijewelry.com/collections/rings

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