Cartier ring size chart
Cartier’s size number is the ring’s inside circumference in millimetres. The size to buy can change by collection, so check the model’s adjustment before choosing.
The key facts
| Size means | Inside circumference in millimetres |
|---|---|
| Sizes in the chart | 44 to 71; Love up to 72 |
| Half sizes | No, whole numbers only |
| How the brand says to measure | Printable PDF, a ring you already wear, or a boutique appointment |
| Source date | Page read 2026-11-10; no date printed |
Cartier chart as the brand prints it
| Cartier size | Circumference mm | EU | US | UK | Japan |
|---|---|---|---|---|---|
| 44 | 44.0 | 44 | 3 | F 1/2 | 4 |
| 45 | 45.0 | 45 | 3 1/4 | G | 5 |
| 46 | 46.0 | 46 | 3 3/4 | H | 6 |
| 47 | 47.0 | 47 | 4 | H 1/2 | 7 |
| 48 | 48.0 | 48 | 4 1/2 | I 1/2 | 8 |
| 49 | 49.0 | 49 | 4 3/4 | J 1/2 | 9 |
| 50 | 50.0 | 50 | 5 1/4 | K | 10 |
| 51 | 51.0 | 51 | 5 3/4 | L | 11 |
| 52 | 52.0 | 52 | 6 | L 1/2 | 12 |
| 53 | 53.0 | 53 | 6 1/4 | M 1/2 | 13 |
| 54 | 54.0 | 54 | 6 3/4 | N 1/2 | 14 |
| 55 | 55.0 | 55 | 7 1/4 | O | 15 |
| 56 | 56.0 | 56 | 7 1/2 | P | 16 |
| 57 | 57.0 | 57 | 8 | P 1/2 | 17 |
| 58 | 58.0 | 58 | 8 1/4 | Q 1/2 | 18 |
| 59 | 59.0 | 59 | 8 3/4 | R | 19 |
| 60 | 60.0 | 60 | 9 | S | 20 |
| 61 | 61.0 | 61 | 9 1/2 | S 1/2 | 21 |
| 62 | 62.0 | 62 | 10 | T 1/2 | 22 |
| 63 | 63.0 | 63 | 10 1/4 | U 1/2 | 23 |
| 64 | 64.0 | 64 | 10 3/4 | V | 24 |
| 65 | 65.0 | 65 | 11 | W | 25 |
| 66 | 66.0 | 66 | 11 1/2 | W 1/2 | 26 |
| 67 | 67.0 | 67 | 11 3/4 | X 1/2 | 27 |
| 68 | 68.0 | 68 | 12 1/4 | Z | 28 |
| 69 | 69.0 | 69 | 12 1/2 | Z 1/2 | 29 |
| 70 | 70.0 | 70 | 13 | – | 30 |
| 71 | 71.0 | 71 | 13 1/4 | – | 31 |
Figures are copied as printed; a blank means the brand prints no figure.
Cartier
Cartier uses whole-number millimetre sizes for inside circumference, and its chart converts them to US, UK and Japan sizes. For US 7, find the matching row in the table; the reference gives its circumference as 54.4 mm and ISO size as 54.
The collection changes the size to buy: add 1 for Love; subtract 1 for Juste un Clou, Trinity classic and Clash medium; subtract 2 for Trinity large and Clash small. Keep the finger size for other models. Cartier says the table is for recommendation only, and available sizes depend on the model.
Cartier says to use its printable circle PDF with a credit card to check print scale, use a ring you already wear, or book a boutique appointment for the most accurate result. If this table differs from Cartier’s current chart, follow the current chart.
Brand names are used only to describe the sizes each brand sells. RingSteps is not affiliated with, endorsed by or sponsored by any of them.
Where this comes from
Cartier ring size guide (Cartier) November 10, 2026
Ring sizes by brand