Blue Nile ring size guide
Blue Nile uses standard US ring sizing in quarter and half steps. Your US size is your Blue Nile size; the chart below adds UK, EU and millimetre equivalents.
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Your size is US 7 (UK N½, EU 54).
Fit confidence Exact table match
Fit confidence 70/100 · Medium Standard chart conversion; final fit still depends on band width and knuckle shape. Confirm with a printable or physical sizer before ordering an expensive ring.
- US
- 7
- UK
- N½
- EU / ISO
- 54
- Japan
- 14
- CH / IT / ES
- 14
- Inner diameter, millimetres
- 17.32
- Circ mm
- 54.4
Why this size?
Your input maps to US 7 — UK N½, EU 54, JP 14, Ø 17.32 mm.
Inner diameter is exact to about ±0.1 mm. String or on-screen methods add roughly ½–1 size of noise, so confirm with a second method before buying an expensive or non-resizable ring.
More options
Choose the fit problem and get the safest next step before resizing, replacing or buying another ring.
Too tight or stuck Too loose or spinning Wide band or comfort-fit Non-resizable or brand ring
| US | UK | EU | JP | CH | Inner diameter, millimetres | 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 Blue Nile sizing works
Blue Nile offers US sizes (often in quarter sizes). Measure your US size and order it directly; they also provide free resizing on many styles.
Fast conversion anchors
These common reference points come from the same table used by the converter.
| Brand size | US | UK | EU |
|---|---|---|---|
| 6 | 6 | L½ | 52 |
| 7 | 7 | N½ | 54 |
| 9 | 9 | R½ | 60 |
Wide-band size calculator
Estimate the order size for a wider band, then confirm before buying a non-resizable ring.
Blue Nile ring size chart
| Blue Nile (US) | UK | EU | Inner diameter, millimetres |
|---|---|---|---|
| 3 | F½ | 44 | 14.07 |
| 3.5 | G½ | 45 | 14.48 |
| 4 | H½ | 47 | 14.88 |
| 4.5 | I½ | 48 | 15.29 |
| 5 | J½ | 49 | 15.70 |
| 5.5 | K½ | 51 | 16.10 |
| 6 | L½ | 52 | 16.51 |
| 6.5 | M½ | 53 | 16.92 |
| 7 | N½ | 54 | 17.32 |
| 7.5 | O½ | 56 | 17.73 |
| 8 | P½ | 57 | 18.14 |
| 8.5 | Q½ | 58 | 18.54 |
| 9 | R½ | 60 | 18.95 |
| 9.5 | S½ | 61 | 19.35 |
| 10 | T½ | 62 | 19.76 |
| 10.5 | U½ | 63 | 20.17 |
| 11 | V½ | 65 | 20.57 |
| 11.5 | W½ | 66 | 20.98 |
| 12 | Y | 67 | 21.39 |
| 12.5 | Z | 68 | 21.79 |
| 13 | Z½ | 70 | 22.20 |
Frequently asked questions
Does Blue Nile use US ring sizes?
Yes. Blue Nile uses US sizing, often in quarter-size steps. A Blue Nile 7 is a US 7 (UK N½, EU 54).
What ring sizes does Blue Nile offer?
Standard US sizes, frequently in quarter increments, with free resizing available on many designs.
Ringsizely is an independent ring size converter and is not affiliated with, endorsed by, or sponsored by Blue Nile. Brand names are used for identification only. Always confirm with the retailer before ordering a non-resizable ring.