Cartier ring size guide
Cartier uses European (ISO) sizing — the number is the inner circumference in millimetres. A Cartier 52 is a 52 mm circumference, i.e. a US 6.
You're between sizes (~US 6.84). We recommend sizing up to US 7 (UK N½) — a slightly loose ring is wearable, a stuck one is not.
Fit confidence Between sizes
Measurement confidence 60/100 · Medium The input falls between two orderable sizes, so the recommendation is rounded up. Use the between-sizes advisor or test the larger size before buying.
- US
- 7
- UK
- N½
- EU / ISO
- 54
- Japan
- 14
- CH / IT / ES
- 14
- Ø mm
- 17.32
- Circ mm
- 54.4
| US | UK | EU | JP | CH | Ø mm | Circ mm |
|---|---|---|---|---|---|---|
| 3 | F½ | 44 | 4 | 4 | 14.07 | 44.2 |
| 3.5 | G½ | 45 | 5 | 5 | 14.48 | 45.5 |
| 4 | H½ | 47 | 7 | 7 | 14.88 | 46.8 |
| 4.5 | I½ | 48 | 8 | 8 | 15.29 | 48.0 |
| 5 | J½ | 49 | 9 | 9 | 15.70 | 49.3 |
| 5.5 | K½ | 51 | 10 | 11 | 16.10 | 50.6 |
| 6 | L½ | 52 | 12 | 12 | 16.51 | 51.9 |
| 6.5 | M½ | 53 | 13 | 13 | 16.92 | 53.1 |
| 7 | N½ | 54 | 14 | 14 | 17.32 | 54.4 |
| 7.5 | O½ | 56 | 15 | 16 | 17.73 | 55.7 |
| 8 | P½ | 57 | 16 | 17 | 18.14 | 57.0 |
| 8.5 | Q½ | 58 | 17 | 18 | 18.54 | 58.3 |
| 9 | R½ | 60 | 18 | 20 | 18.95 | 59.5 |
| 9.5 | S½ | 61 | 19 | 21 | 19.35 | 60.8 |
| 10 | T½ | 62 | 20 | 22 | 19.76 | 62.1 |
| 10.5 | U½ | 63 | 22 | 23 | 20.17 | 63.4 |
| 11 | V½ | 65 | 23 | 25 | 20.57 | 64.6 |
| 11.5 | W½ | 66 | 24 | 26 | 20.98 | 65.9 |
| 12 | Y | 67 | 25 | 27 | 21.39 | 67.2 |
| 12.5 | Z | 68 | 26 | 28 | 21.79 | 68.5 |
| 13 | Z½ | 70 | 27 | 30 | 22.20 | 69.7 |
How Cartier sizing works
Cartier rings (including the Love and Trinity) are sized in EU/ISO numbers, usually 48–62. Cartier 50 ≈ US 5½, 52 ≈ US 6, 54 ≈ US 7, 56 ≈ US 7½.
Cartier exact-size answers
Cartier ring size chart
| Cartier (EU) | US | UK | Ø mm |
|---|---|---|---|
| 44 | 3 | F½ | 14.07 |
| 45 | 3.5 | G½ | 14.48 |
| 47 | 4 | H½ | 14.88 |
| 48 | 4.5 | I½ | 15.29 |
| 49 | 5 | J½ | 15.70 |
| 51 | 5.5 | K½ | 16.10 |
| 52 | 6 | L½ | 16.51 |
| 53 | 6.5 | M½ | 16.92 |
| 54 | 7 | N½ | 17.32 |
| 56 | 7.5 | O½ | 17.73 |
| 57 | 8 | P½ | 18.14 |
| 58 | 8.5 | Q½ | 18.54 |
| 60 | 9 | R½ | 18.95 |
| 61 | 9.5 | S½ | 19.35 |
| 62 | 10 | T½ | 19.76 |
| 63 | 10.5 | U½ | 20.17 |
| 65 | 11 | V½ | 20.57 |
| 66 | 11.5 | W½ | 20.98 |
| 67 | 12 | Y | 21.39 |
| 68 | 12.5 | Z | 21.79 |
| 70 | 13 | Z½ | 22.20 |
Frequently asked questions
What is Cartier ring size 52 in US?
Cartier 52 is a US 6 (UK L½, 52 mm circumference, 16.5 mm diameter). Cartier uses EU/ISO sizing.
What is a Cartier Love ring size 54 in US?
Cartier 54 is a US 7 (UK N½, 54 mm circumference). The Love bracelet and rings both use the EU number = circumference in mm.
Does Cartier use US ring sizes?
No. Cartier uses the European (ISO 8653) system, where the size equals the inner circumference in millimetres. Convert to US with the tool above.
Ringsizely is an independent ring size converter and is not affiliated with, endorsed by, or sponsored by Cartier. Brand names are used for identification only. Always confirm with the retailer before ordering a non-resizable ring.