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US ring size 9½

A US size 9½ ring is 19.35 mm (0.762") across the inside and 60.8 mm (2.39") round. It converts to UK S½, EU 61, Japan 20 and Swiss 21. The 1:1 circle below is already set to size 9½: lay a ring on it to check yours.

Try

Lay a ring that fits flat on the circle and size the red line until it just touches the inside edge of the band all the way round: on a phone, slide sideways anywhere on the stage or hold the buttons below; on a computer, drag the edge, scroll or press ← →. The gold ring is the band’s wall: don’t match its outside.

US 9½19.35 mm · 0.762" inside · 60.8 mm round
Inside diameter19.35 mm
Band wall1.8 mm
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Full chart 19 rows

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Size 9½ and the quarter sizes around it

9 rows
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US ring size 9.5 and quarter sizes within one size either side: inside diameter, difference in mm, circumference, UK and EU sizes
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18.54−0.81 mm58.2Q½58
18.74−0.61 mm58.9R59
18.95−0.41 mm59.5R½60
19.15−0.20 mm60.2S60
19.35—60.8S½61
19.55+0.20 mm61.4T61
19.76+0.41 mm62.1T½62
19.96+0.61 mm62.7U63
20.16+0.81 mm63.3U½63

Ordering a size 9½ in different band widths

4 rows
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What size to order for a US size 9.5 finger in narrow, 4–6 mm, 7 mm and wider, and comfort-fit bands
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9½19.35Bands under 4 mm usually fit true to size.
9¾–1019.55–19.76A 4–6 mm band covers more skin and feels snugger: jewellers suggest a quarter to a half size up.
10–10½19.76–20.16Wide and cigar bands grip the whole finger segment: half a size to a full size up.
9–9¼18.95–19.15A domed comfort-fit inside slips over the knuckle more easily: often a quarter to a half size down.

Blank length for a size 9½ band

6 rows
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Length of wire or sheet to cut for a US size 9.5 ring band (19.35 mm inside) in stock 1.0 to 2.5 mm thick, by π × (inside diameter + thickness)
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63.92.517"21.35
64.62.542"21.75
65.52.579"22.35
66.42.616"22.95
67.12.641"23.35
68.62.703"24.35

05 / Field guide

Size 9½,
19.35 mm inside.

Everything about a US 9½: what it measures, who usually wears it, how it converts in each country, the quarter sizes around it and what to order for wide bands. Neighbouring sheets: size 9 and size 10.

Who wears a size 9½

A US 9½ is where the ranges meet: a larger women’s size and the start of the men’s 9 to 12 range. Jewellers’ order data puts the most common women’s size at 7 and men’s at 10, so a 9½ is 2.5 sizes above the usual women’s size and 0.5 sizes below the usual men’s size. The same finger is often a quarter to half size larger on the dominant hand.

It is 0.41 mm wider inside than a 9 (18.95 mm) and 0.41 mm narrower than a 10 (19.76 mm). On the circumference that is 1.28 mm per half size, which is why a strip of string, stretching a couple of millimetres as you pull it snug, can misread a 9½ by most of a size.

Size 9½ in the UK, Europe and Japan

A 9½ is 60.8 mm round. UK letters on the BS 6820 scale cover 0.625 mm each with half sizes, and S½ runs from 60.31 to 60.94 mm, so a 9½ sits near the top of S½. If you are on the large side of a 9½, a UK T may suit better.

ISO 8653 rounds to the nearest millimetre, so EU 61 covers 60.5 to 61.5 mm and a 9½ lands 0.29 mm into that band. Swiss and Italian sizes subtract 40, giving 21. Japan 20 is 19.3 mm inside, 0.05 mm smaller than a US 9½, so Japanese 20 is the nearest match.

Quarter sizes either side

A 9¼ is 19.15 mm and a 9¾ is 19.55 mm, each about 0.2 mm from a 9½: roughly the thickness of two sheets of paper on the diameter. If your ring falls between 9¼ and 9¾ on the 1:1 circle, order a 9½ for a band under 4 mm.

For a 4–6 mm band, jewellers suggest 9¾ to 10; for 7 mm and wider, 10 to 10½; for a comfort-fit inside, 9 to 9¼. Smart-ring kits that include a size 10 sample: Oura Ring 4, Galaxy Ring, Ring AIR.

Making a size 9½ band

The blank length is the circumference of the middle of the band wall: π × (19.35 + thickness). Cut 65.5 mm of 1.5 mm stock or 67.1 mm of 2.0 mm stock, and the finished band has an outside diameter of 22.35 or 23.35 mm. Leave a little extra for filing the joint, and true the band on a mandrel at 9½ after soldering.

Blank = π × (19.35 mm + t) · 1.5 mm → 65.5 mm · 2.0 mm → 67.1 mm

Questions

Answered plainly.

01What is a size 9½ ring in mm?+

A US size 9½ ring is 19.35 mm (0.762") across the inside, with an inside circumference of 60.8 mm (2.39").

02What is a US size 9½ in UK and EU sizes?+

US 9½ is UK S½ and EU (ISO 8653) 61. It is also Japan 20 and Swiss 21.

03How much bigger is a size 10 than a size 9½?+

A size 10 is 0.41 mm wider inside (19.76 against 19.35 mm) and 1.28 mm longer round.

04How long a blank do I cut for a size 9½ ring?+

65.5 mm for 1.5 mm thick stock and 67.1 mm for 2.0 mm, from π × (19.35 mm + thickness).

05Should I order a size 9½ for a wide band?+

For a band 7 mm or wider, jewellers suggest 10 to 10½; for 4–6 mm, 9¾ to 10. Under 4 mm, a 9½ fits true to size.

Ring sizesUS · inside Ø mm

Carat sizes

Necklace lengths