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US ring size 15

A US size 15 ring is 23.82 mm (0.938") across the inside and 74.8 mm (2.95") round. It converts to UK beyond Z+4, EU 75, Japan above 30 and Swiss 35. The 1:1 circle below is already set to size 15: 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 1523.82 mm · 0.938" inside · 74.8 mm round
Inside diameter23.82 mm
Band wall1.8 mm
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Full chart 19 rows

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Size 15 and the quarter sizes around it

9 rows
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US ring size 15 and quarter sizes within one size either side: inside diameter, difference in mm, circumference, UK and EU sizes
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23.01−0.81 mm72.3Z+372
23.21−0.61 mm72.9Z+3½73
23.42−0.41 mm73.6Z+474
23.62−0.20 mm74.2—74
23.82—74.8—75
24.03+0.20 mm75.5—75
24.23+0.41 mm76.1—76
24.43+0.61 mm76.8—77
24.63+0.81 mm77.4—77

Ordering a size 15 in different band widths

4 rows
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What size to order for a US size 15 finger in narrow, 4–6 mm, 7 mm and wider, and comfort-fit bands
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1523.82Bands under 4 mm usually fit true to size.
15¼–15½24.03–24.23A 4–6 mm band covers more skin and feels snugger: jewellers suggest a quarter to a half size up.
15½–1624.23–24.63Wide and cigar bands grip the whole finger segment: half a size to a full size up.
14½–14¾23.42–23.62A domed comfort-fit inside slips over the knuckle more easily: often a quarter to a half size down.

Blank length for a size 15 band

6 rows
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Length of wire or sheet to cut for a US size 15 ring band (23.82 mm inside) in stock 1.0 to 2.5 mm thick, by π × (inside diameter + thickness)
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78.03.070"25.82
78.63.095"26.22
79.63.132"26.82
80.53.169"27.42
81.13.194"27.82
82.73.256"28.82

05 / Field guide

Size 15,
23.82 mm inside.

Everything about a US 15: 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 14½.

Who wears a size 15

A US 15 is a large men’s size above the usual 9 to 12 range, also used for men’s thumb rings. Jewellers’ order data puts the most common women’s size at 7 and men’s at 10, so a 15 is 8 sizes above the usual women’s size and 5 sizes 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 14½ (23.42 mm) and 0.41 mm narrower than a 15½ (24.23 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 15 by most of a size.

Size 15 in the UK, Europe and Japan

A 15 is 74.8 mm round. UK letters on the BS 6820 scale cover 0.625 mm each with half sizes, and beyond Z+4 runs from 74.69 to 75.31 mm, so a 15 sits near the bottom of beyond Z+4. If you are on the small side of a 15, a UK Z+4½ may suit better.

ISO 8653 rounds to the nearest millimetre, so EU 75 covers 74.5 to 75.5 mm and a 15 lands 0.34 mm into that band. Swiss and Italian sizes subtract 40, giving 35. This size is outside the Japanese 1–30 table.

Quarter sizes either side

A 14¾ is 23.62 mm and a 15¼ is 24.03 mm, each about 0.2 mm from a 15: roughly the thickness of two sheets of paper on the diameter. If your ring falls between 14¾ and 15¼ on the 1:1 circle, order a 15 for a band under 4 mm.

For a 4–6 mm band, jewellers suggest 15¼ to 15½; for 7 mm and wider, 15½ to 16; for a comfort-fit inside, 14½ to 14¾. Smart-ring kits that include a size 15 sample: Oura Ring 4, Galaxy Ring. Ring AIR does not reach it.

Making a size 15 band

The blank length is the circumference of the middle of the band wall: π × (23.82 + thickness). Cut 79.6 mm of 1.5 mm stock or 81.1 mm of 2.0 mm stock, and the finished band has an outside diameter of 26.82 or 27.82 mm. Leave a little extra for filing the joint, and true the band on a mandrel at 15 after soldering.

Blank = π × (23.82 mm + t) · 1.5 mm → 79.6 mm · 2.0 mm → 81.1 mm

Questions

Answered plainly.

01What is a size 15 ring in mm?+

A US size 15 ring is 23.82 mm (0.938") across the inside, with an inside circumference of 74.8 mm (2.95").

02What is a US size 15 in UK and EU sizes?+

US 15 is UK beyond Z+4 and EU (ISO 8653) 75. It is also Japan above 30 and Swiss 35.

03How much bigger is a size 15½ than a size 15?+

A size 15½ is 0.41 mm wider inside (24.23 against 23.82 mm) and 1.28 mm longer round.

04How long a blank do I cut for a size 15 ring?+

79.6 mm for 1.5 mm thick stock and 81.1 mm for 2.0 mm, from π × (23.82 mm + thickness).

05Should I order a size 15 for a wide band?+

For a band 7 mm or wider, jewellers suggest 15½ to 16; for 4–6 mm, 15¼ to 15½. Under 4 mm, a 15 fits true to size.

Ring sizesUS · inside Ø mm

Carat sizes

Necklace lengths