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US ring size 11

A US size 11 ring is 20.57 mm (0.810") across the inside and 64.6 mm (2.54") round. It converts to UK V½, EU 65, Japan 24 and Swiss 24.5. The 1:1 circle below is already set to size 11: 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 1120.57 mm · 0.810" inside · 64.6 mm round
Inside diameter20.57 mm
Band wall1.8 mm
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Full chart 19 rows

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Size 11 and the quarter sizes around it

9 rows
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US ring size 11 and quarter sizes within one size either side: inside diameter, difference in mm, circumference, UK and EU sizes
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19.76−0.81 mm62.1T½62
19.96−0.61 mm62.7U63
20.16−0.41 mm63.3U½63
20.37−0.20 mm64.0V64
20.57—64.6V½65
20.77+0.20 mm65.3W65
20.98+0.41 mm65.9W½66
21.18+0.61 mm66.5X67
21.38+0.81 mm67.2X½67

Ordering a size 11 in different band widths

4 rows
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What size to order for a US size 11 finger in narrow, 4–6 mm, 7 mm and wider, and comfort-fit bands
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1120.57Bands under 4 mm usually fit true to size.
11¼–11½20.77–20.98A 4–6 mm band covers more skin and feels snugger: jewellers suggest a quarter to a half size up.
11½–1220.98–21.38Wide and cigar bands grip the whole finger segment: half a size to a full size up.
10½–10¾20.16–20.37A domed comfort-fit inside slips over the knuckle more easily: often a quarter to a half size down.

Blank length for a size 11 band

6 rows
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Length of wire or sheet to cut for a US size 11 ring band (20.57 mm inside) in stock 1.0 to 2.5 mm thick, by π × (inside diameter + thickness)
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67.82.668"22.57
68.42.693"22.97
69.32.730"23.57
70.32.767"24.17
70.92.792"24.57
72.52.854"25.57

05 / Field guide

Size 11,
20.57 mm inside.

Everything about a US 11: 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 10½ and size 11½.

Who wears a size 11

A US 11 is squarely in the men’s range (most men wear 9 to 12), and a common thumb-ring size for women. Jewellers’ order data puts the most common women’s size at 7 and men’s at 10, so a 11 is 4 sizes above the usual women’s size and 1 size above 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 10½ (20.16 mm) and 0.41 mm narrower than a 11½ (20.98 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 11 by most of a size.

Size 11 in the UK, Europe and Japan

A 11 is 64.6 mm round. UK letters on the BS 6820 scale cover 0.625 mm each with half sizes, and V½ runs from 64.06 to 64.69 mm, so a 11 sits near the top of V½. If you are on the large side of a 11, a UK W may suit better.

ISO 8653 rounds to the nearest millimetre, so EU 65 covers 64.5 to 65.5 mm and a 11 lands 0.13 mm into that band. Swiss and Italian sizes subtract 40, giving 24.5. Japan 24 is 20.7 mm inside, 0.13 mm larger than a US 11, so Japanese 24 is the nearest match.

Quarter sizes either side

A 10¾ is 20.37 mm and a 11¼ is 20.77 mm, each about 0.2 mm from a 11: roughly the thickness of two sheets of paper on the diameter. If your ring falls between 10¾ and 11¼ on the 1:1 circle, order a 11 for a band under 4 mm.

For a 4–6 mm band, jewellers suggest 11¼ to 11½; for 7 mm and wider, 11½ to 12; for a comfort-fit inside, 10½ to 10¾. Smart-ring kits that include a size 11 sample: Oura Ring 4, Galaxy Ring, Ring AIR.

Making a size 11 band

The blank length is the circumference of the middle of the band wall: π × (20.57 + thickness). Cut 69.3 mm of 1.5 mm stock or 70.9 mm of 2.0 mm stock, and the finished band has an outside diameter of 23.57 or 24.57 mm. Leave a little extra for filing the joint, and true the band on a mandrel at 11 after soldering.

Blank = π × (20.57 mm + t) · 1.5 mm → 69.3 mm · 2.0 mm → 70.9 mm

Questions

Answered plainly.

01What is a size 11 ring in mm?+

A US size 11 ring is 20.57 mm (0.810") across the inside, with an inside circumference of 64.6 mm (2.54").

02What is a US size 11 in UK and EU sizes?+

US 11 is UK V½ and EU (ISO 8653) 65. It is also Japan 24 and Swiss 24.5.

03How much bigger is a size 11½ than a size 11?+

A size 11½ is 0.41 mm wider inside (20.98 against 20.57 mm) and 1.28 mm longer round.

04How long a blank do I cut for a size 11 ring?+

69.3 mm for 1.5 mm thick stock and 70.9 mm for 2.0 mm, from π × (20.57 mm + thickness).

05Should I order a size 11 for a wide band?+

For a band 7 mm or wider, jewellers suggest 11½ to 12; for 4–6 mm, 11¼ to 11½. Under 4 mm, a 11 fits true to size.

Ring sizesUS · inside Ø mm

Carat sizes

Necklace lengths