The complete EU to UK ring size conversion guide 2026 — European Continental ring sizes use a numeric system based on finger circumference in millimetres. Full EU to UK chart (EU 37–EU 72), EU to US/CA conversion, mm diameter and circumference reference, women's and men's averages, and free conversion calculator
European (ISO/DIN standard) ring sizes are based directly on the inner circumference of the ring in millimetres. EU size 52 means the ring has an inner circumference of approximately 52mm — which corresponds to a finger circumference of 52–53mm. This makes EU sizes the most logically intuitive system — if you measure your finger circumference in mm, that number is your EU size.
To convert an EU ring size to a UK ring size — find your EU number in the chart below and read the corresponding UK letter size in the same row. The most common women's conversion is EU 52 = UK N. The most common men's conversion is EU 61 = UK T. Because EU sizes are based on exact mm values, they convert with high precision into UK letter sizes — use the free calculator below for any EU to UK instant result.
The EU ring sizing system (ISO/DIN standard) is the most straightforward to understand — the size number equals the finger's inner circumference in millimetres. EU 52 means a 52mm circumference ring. This makes conversion from a raw mm measurement directly to an EU size trivial — and from EU to UK simply a matter of finding the nearest entry in the chart below and reading the UK letter in the same row.
🇺🇸 US/CA 6.5 | 🇦🇺 AU N
Circumference: 53.8mm
Diameter: 17.1mm
Ring finger, left hand
🇺🇸 US/CA 9.5 | 🇦🇺 AU T
Circumference: 61.4mm
Diameter: 19.56mm
Ring finger, left hand
🇺🇸 US/CA 5.5–7.5 | 51.2–56.3mm
Diameter: 16.3–17.9mm
Most common EU women's range
🇺🇸 US/CA 8.5–10.5 | 58.9–64.0mm
Diameter: 18.6–20.37mm
Most common EU men's range
| 🇪🇺 EU Size | 🇬🇧 UK Size | Circ. (mm) | 🇺🇸 US / 🇨🇦 CA | Typical Wearer |
|---|---|---|---|---|
| 37 | A | 37.8 | — | Children / XS |
| 38 | B | 39.1 | 1 | Children / XS |
| 40 | C | 40.4 | 1.5 | XS Women |
| 41 | D | 41.7 | 2 | Small Women |
| 42 | E | 42.9 | 2.5 | Small Women |
| 43 | F | 44.2 | 3 | Small Women |
| 45 | G | 45.5 | 3.5 | Women |
| 46 | H | 46.8 | 4 | Women |
| 47 | I | 48.0 | 4.5 | Women |
| 48 | J | 48.7 | 4.75 | Women |
| 49 | K | 50.0 | 5 | Women |
| 50 | L | 51.2 | 5.5 | Women |
| 51 | M | 52.5 | 6 | Women |
| 52 ⭐ | N ⭐ | 53.8 | 6.5 | Women's Average ⭐ |
| 54 ⭐ | O ⭐ | 55.1 | 7 | Women Popular |
| 55 ⭐ | P ⭐ | 56.3 | 7.5 | Women Popular |
| 57 | Q | 57.6 | 8 | Slim Men |
| 58 | R | 58.9 | 8.5 | Lean Men |
| 60 | S | 60.2 | 9 | Avg Slim Men |
| 61 ⭐ | T ⭐ | 61.4 | 9.5 | Men's Average ⭐ |
| 63 ⭐ | U ⭐ | 62.7 | 10 | Men Popular |
| 64 ⭐ | V ⭐ | 64.0 | 10.5 | Men Popular |
| 65 | W | 65.3 | 11 | Athletic Men |
| 67 | X | 66.6 | 11.5 | Broad Men |
| 68 | Y | 67.8 | 12 | Large Build |
| 69 | Z | 68.5 | 12.5 | XL Build |
| 70 | Z+1 | 69.7 | 13 | XL Custom |
| 72 | Z+2 | 72.3 | 13.5 | Custom |
You will notice that the EU size scale does not run in perfectly consecutive integers — for example, it goes EU 47 → EU 48 → EU 49 → EU 50 → EU 51 → EU 52 → EU 54 (skipping EU 53). This is because the EU system is based on exact inner circumference in mm, and not every integer millimetre value aligns to a standard UK letter half-size increment. The sizes listed in the chart are the standard EU sizes that correspond to defined UK letter sizes. If you have a ring labelled with an EU size not shown (e.g. EU 53) — use the nearest listed EU size or use the mm circumference calculator below to find the exact UK equivalent.
| 🇪🇺 EU Size | 🇬🇧 UK / 🇦🇺 AU | 🇺🇸 US / 🇨🇦 CA | Circ. (mm) | Diam. (mm) | Circ. (cm) | Circ. (inches) | Best For |
|---|---|---|---|---|---|---|---|
| 37 | A | — | 37.8 mm | 11.9 mm | 3.78 cm | 1.488″ | Children / XS |
| 38 | B | 1 | 39.1 mm | 12.3 mm | 3.91 cm | 1.539″ | Children / XS |
| 40 | C | 1.5 | 40.4 mm | 12.7 mm | 4.04 cm | 1.590″ | XS Women |
| 41 | D | 2 | 41.7 mm | 13.1 mm | 4.17 cm | 1.642″ | Small Women |
| 42 | E | 2.5 | 42.9 mm | 13.5 mm | 4.29 cm | 1.689″ | Small Women |
| 43 | F | 3 | 44.2 mm | 13.9 mm | 4.42 cm | 1.740″ | Small Women |
| 45 | G | 3.5 | 45.5 mm | 14.3 mm | 4.55 cm | 1.791″ | Women |
| 46 | H | 4 | 46.8 mm | 14.7 mm | 4.68 cm | 1.843″ | Women |
| 47 | I | 4.5 | 48.0 mm | 15.1 mm | 4.80 cm | 1.890″ | Women |
| 48 | J | 4.75 | 48.7 mm | 15.5 mm | 4.87 cm | 1.917″ | Women |
| 49 | K | 5 | 50.0 mm | 15.9 mm | 5.00 cm | 1.969″ | Women |
| 50 | L | 5.5 | 51.2 mm | 16.3 mm | 5.12 cm | 2.016″ | Women |
| 51 | M | 6 | 52.5 mm | 16.7 mm | 5.25 cm | 2.067″ | Women |
| 52 ⭐ | N ⭐ | 6.5 | 53.8 mm | 17.1 mm | 5.38 cm | 2.118″ | Women's Avg ⭐ |
| 54 ⭐ | O ⭐ | 7 | 55.1 mm | 17.5 mm | 5.51 cm | 2.169″ | Women Popular |
| 55 ⭐ | P ⭐ | 7.5 | 56.3 mm | 17.9 mm | 5.63 cm | 2.217″ | Women Popular |
| 57 | Q | 8 | 57.6 mm | 18.2 mm | 5.76 cm | 2.268″ | Slim Men |
| 58 | R | 8.5 | 58.9 mm | 18.6 mm | 5.89 cm | 2.319″ | Lean Men |
| 60 | S | 9 | 60.2 mm | 19.1 mm | 6.02 cm | 2.370″ | Avg Slim Men |
| 61 ⭐ | T ⭐ | 9.5 | 61.4 mm | 19.56 mm | 6.14 cm | 2.417″ | Men's Avg ⭐ |
| 63 ⭐ | U ⭐ | 10 | 62.7 mm | 19.96 mm | 6.27 cm | 2.469″ | Men Popular |
| 64 ⭐ | V ⭐ | 10.5 | 64.0 mm | 20.37 mm | 6.40 cm | 2.520″ | Men Popular |
| 65 | W | 11 | 65.3 mm | 20.78 mm | 6.53 cm | 2.571″ | Athletic Men |
| 67 | X | 11.5 | 66.6 mm | 21.18 mm | 6.66 cm | 2.622″ | Broad Men |
| 68 | Y | 12 | 67.8 mm | 21.59 mm | 6.78 cm | 2.669″ | Large Build |
| 69 | Z | 12.5 | 68.5 mm | 21.79 mm | 6.85 cm | 2.697″ | XL Build |
| 70 | Z+1 | 13 | 69.7 mm | 22.20 mm | 6.97 cm | 2.744″ | XL Custom |
| 72 | Z+2 | 13.5 | 72.3 mm | 23.01 mm | 7.23 cm | 2.846″ | Custom |
Many popular jewellery brands and Etsy sellers based in Europe (Pandora EU, TJC, Scandinavian designers, French and Italian jewellers) list their rings in EU sizes. When ordering from any of these retailers — find your EU size equivalent using the chart above and select that EU size at checkout.
Common women's EU sizes and UK equivalents: EU 50 = UK L · EU 51 = UK M · EU 52 = UK N · EU 54 = UK O · EU 55 = UK P
Common men's EU sizes and UK equivalents: EU 58 = UK R · EU 60 = UK S · EU 61 = UK T · EU 63 = UK U · EU 64 = UK V
If the EU retailer's size chart shows sizes in consecutive integers (e.g. EU 53, EU 56) that are not listed in the standard chart — these are simply intermediate sizes. Select the nearest EU size listed in the chart above, rounding up to the larger size when in doubt.
Pandora lists its rings in EU sizes in its European stores and on pandora.net. The most popular Pandora ring sizes for women are EU 52 (UK N), EU 54 (UK O) and EU 56 (between UK O and UK P — select UK P). Pandora also offers its own free ring sizing service in-store — any Pandora boutique in the UK can measure your finger in EU and provide the direct UK equivalent. If ordering Pandora online from a European store for UK delivery — use the EU size from the chart and select it directly at checkout.
Because EU sizes represent circumference in mm — and the UK letter system increments by approximately 1.25mm per letter — you can estimate the UK letter from any EU size using this simple method:
Step 1: Take your EU size (e.g. EU 55).
Step 2: Subtract 37 from the EU size: 55 − 37 = 18.
Step 3: Divide by approximately 1.25: 18 ÷ 1.25 = 14.4.
Step 4: The 14th letter of the alphabet is N — so EU 55 ≈ UK N/O (confirm using chart).
This formula gives a close estimate — always confirm with the full chart above for the precise mapping, as the UK letter increments are not perfectly uniform across the full range.