Brand chart · United States
Kay Jewelers ring size chart
Kay quotes standard US numeric sizes, typically 3 to 13½ in half steps. The table below gives each one as an inside diameter and circumference in millimetres, with the international equivalents beside it.
The table
Kay Jewelers sizes in millimetres
Kay Jewelers quotes the us / canada numeric scale. A number from about 2 to 15 in half and quarter steps. Each whole size adds 2.5535 mm of inside circumference, so the scale is a straight line.
| Kay Jewelers size | Ø mm | Circ. mm | UK / AU | EU / ISO | India | Japan |
|---|---|---|---|---|---|---|
| 3 | 14.1 | 44.2 | F | 44 | 4 | #4 |
| 3½ | 14.5 | 45.5 | G | 45 | 5 | #5 |
| 4 | 14.9 | 46.8 | H | 47 | 7 | #6 |
| 4½ | 15.3 | 48.0 | I | 48 | 8 | #8 |
| 5 | 15.7 | 49.3 | J | 49 | 9 | #9 |
| 5½ | 16.1 | 50.6 | K | 51 | 11 | #10 |
| 6 | 16.5 | 51.9 | L | 52 | 12 | #11 |
| 6½ | 16.9 | 53.1 | M | 53 | 13 | #13 |
| 7 | 17.3 | 54.4 | N | 54 | 14 | #14 |
| 7½ | 17.7 | 55.7 | O | 56 | 15 | #15 |
| 8 | 18.1 | 57.0 | P | 57 | 17 | #16 |
| 8½ | 18.5 | 58.2 | Q | 58 | 18 | #17 |
| 9 | 18.9 | 59.5 | R | 60 | 19 | #18 |
| 9½ | 19.4 | 60.8 | S | 61 | 21 | #19 |
| 10 | 19.8 | 62.1 | T | 62 | 22 | #21 |
| 10½ | 20.2 | 63.3 | U | 63 | 23 | #22 |
| 11 | 20.6 | 64.6 | V | 65 | 25 | #23 |
| 11½ | 21.0 | 65.9 | W | 66 | 26 | #24 |
| 12 | 21.4 | 67.2 | X | 67 | 27 | #25 |
| 12½ | 21.8 | 68.5 | Y | 68 | 28 | #27 |
| 13 | 22.2 | 69.7 | Z | 70 | 30 | #28 |
| 13½ | 22.6 | 71.0 | Z+1 | 71 | 31 | #29 |
Derived from ISO 8653, the standard the whole trade sizes against, and labelled with the scale Kay Jewelers prints. It is a conversion table, not a copy of the brand's own list — confirm the exact range against the retailer before ordering, since any house can change what it stocks.
Where the range sits
Women’s styles cluster between US 5 and 8, men’s between US 9 and 12. Sizes outside those bands are real but often made to order, which matters when you are buying against a date.
Half sizes are the practical granularity. If a measurement lands on a quarter, round up rather than down — the ring that is slightly loose can be adjusted, the one that does not fit cannot be worn while you wait.
Wide bands and comfort fit
Men’s bands in particular are often 6 mm or wider, and a wide band wears tighter at the same nominal size. Add half a size from about 5 mm of width and a full size from about 9 mm; the men’s ring size chart covers the upper range in detail.
Comfort-fit bands, which are domed on the inside, run the other way: they slide on more easily and often fit a quarter to a half size smaller than a flat band of the same nominal size. Try one on if you can before ordering. The calibrated ring sizer gives you the inside diameter in millimetres, which is the one number that means the same thing in every catalogue.
Before you order
What moves the size on a Kay Jewelers ring
- Comfort fit runs large
- A domed inner surface passes the knuckle more easily. Many people take a quarter to a half size less in comfort fit than in a flat band.
- Wide bands need the allowance
- Half a size up from about 5 mm of width, a full size from about 9 mm.
- Round up on a quarter
- Stock is half sizes. A quarter-size measurement should take the half above it.
Ordering from elsewhere
Your size in the market you are buying from
The us / canada numeric scale is read in United States, Canada, Singapore, Malaysia, United Arab Emirates. Pick where you are ordering from and the switcher gives the local number for the same finger — or the millimetre, where local practice is too mixed to convert into.
Do not know it? Measure a ring on your calibrated screen — it is the only number here that is not a conversion of another number.
Indian numeric
14
A number from 1 to about 30. Indian jewellers frequently print the UK letter beside it, because both are in daily use.
India. Indian jewellers quote a numeric scale of their own, roughly 1 to 30. Tanishq, Malabar Gold, Kalyan and GIVA all use it, and many print the UK letter beside it. Online-first brands often list US sizes as well, so check which scale a listing means before ordering. Full India ring size chart.
United States. The US numeric scale, sold mostly in half sizes. Quarter sizes exist and a jeweller can cut them, but they are rarely stocked. Full USA ring size chart.
United Kingdom. Letters, in half-letter steps. British hallmarked rings are usually stamped with the letter, so an inherited ring often tells you its own size if you look inside the band. Full UK ring size chart.
Europe. France, Germany, the Netherlands and Scandinavia quote the ISO 8653 number, which is the inside circumference in millimetres. Italy, Spain and Switzerland quote the same measurement minus 40, so a 54 becomes a 14. Full Europe ring size chart.
Japan. The Japanese numeric scale runs #1 to about #27 for the sizes people actually order. Mikimoto, Tasaki and 4°C all use it. Japanese sizes are usually whole numbers only. Full Japan ring size chart.
China. Mainland Chinese listings usually give 圈号 — the inside circumference in millimetres, the same number as EU/ISO. Hong Kong uses a separate numbered scale, and marketplace listings mix both with US sizes. Order by inside diameter in millimetres when a listing does not say which scale it means.
Australia. Australia and New Zealand use the UK letter scale unchanged, so a UK N is an Australian N.
Canada. Identical to the United States. A US 7 is a Canadian 7, with no conversion in between.
Singapore. Singapore retail is mixed: international brands quote US numbers, goldsmiths in the Chinese tradition quote Hong Kong numbers, and British-founded chains quote letters. Ask for the inside diameter in millimetres and you sidestep the whole problem.
Malaysia. As in Singapore, US numbers dominate modern retail while traditional goldsmiths use Hong Kong numbers. Confirm the scale, or the diameter, before you order.
United Arab Emirates. Gulf retail quotes US sizes most often. British-founded chains use letters, and the many Indian gold houses in Dubai use the Indian scale, so the same finger can be quoted three ways along one street.
South Africa. South Africa follows the UK letter scale. Online stores that ship from the United States will quote numbers instead.
Brazil. Brazilian sizes are the inside circumference in millimetres minus 40 — the same arithmetic Switzerland uses. A 54 mm circumference is a Brazilian 14.
Mexico. Mexican jewellers use a local numeric scale that is not the US one, and the published conversions for it disagree with each other. We will not print a number we cannot stand behind, so order by inside diameter in millimetres, or ask the retailer for the diameter of the size they are offering. Large chains and online stores generally quote US sizes.
Questions
Kay Jewelers sizing, answered
What ring sizes does Kay carry?
The US numeric scale, generally 3 to 13½ in half sizes, with the deepest stock between 5 and 8 for women and 9 and 12 for men.
What is a size 7 ring in mm?
17.3 mm inside diameter, 54.4 mm inside circumference. Every other size is in the table above.
Does a comfort-fit band change my size?
Usually. The rounded inside passes the knuckle more easily, so a comfort-fit band often fits a quarter to a half size smaller than a flat band of the same number.
How do I measure a ring size at home for a Kay ring?
Measure the inside diameter of a ring that already fits, then read the US column above. The how to measure guide covers the paper-strip and printed-sizer methods too.
Measure once, order in any scale
The sizer calibrates your screen against a bank card first, so the circle you match your ring to is a real millimetre wide.