The complete Canada to UK ring size conversion guide 2026 — Canadian ring sizes use the US numeric system. Full CA to UK conversion chart, CA to EU conversion, mm diameter and circumference reference, women's and men's average sizes, half-size guide, and free conversion calculator
Canada uses the same numeric ring sizing system as the United States — a scale running from size 1 to 13.5 in half-size increments. A ring labelled CA Size 6.5 is exactly the same as US Size 6.5 — the same circumference (53.8mm) and the same fit on the finger.
To convert a Canadian ring size to a UK ring size — find your CA/US numeric size in the chart below and read the corresponding UK letter size. The most common women's conversion is CA 6.5 = UK N. The most common men's conversion is CA 9.5 = UK T. Use the free calculator below for any CA size to UK, EU, or mm instant conversion.
Unlike Australia and New Zealand which share the UK letter system, Canada uses the US numeric ring size system. This means a genuine conversion is required to translate a Canadian ring size into a UK letter size. The full conversion chart below covers every Canadian / US size from 1 to 13.5 with its exact UK, EU, mm circumference and mm diameter equivalent.
🇪🇺 EU 52 | Circumference: 53.8mm
Diameter: 17.1mm
Ring finger, left hand
🇪🇺 EU 61 | Circumference: 61.4mm
Diameter: 19.56mm
Ring finger, left hand
🇪🇺 EU 50–55 | 51.2–56.3mm
Diameter: 16.3–17.9mm
Most common CA range
🇪🇺 EU 58–64 | 58.9–64.0mm
Diameter: 18.6–20.37mm
Most common CA range
| 🇨🇦 CA / 🇺🇸 US Size | 🇬🇧 UK Size | Circ. (mm) | 🇪🇺 EU Size | Typical Wearer |
|---|---|---|---|---|
| 1 | B | 39.1 | 38 | Children / XS |
| 1.5 | C | 40.4 | 40 | XS Women |
| 2 | D | 41.7 | 41 | Small Women |
| 2.5 | E | 42.9 | 42 | Small Women |
| 3 | F | 44.2 | 43 | Small Women |
| 3.5 | G | 45.5 | 45 | Women |
| 4 | H | 46.8 | 46 | Women |
| 4.5 | I | 48.0 | 47 | Women |
| 4.75 | J | 48.7 | 48 | Women |
| 5 | K | 50.0 | 49 | Women |
| 5.5 | L | 51.2 | 50 | Women |
| 6 | M | 52.5 | 51 | Women |
| 6.5 ⭐ | N ⭐ | 53.8 | 52 | Women's Average ⭐ |
| 7 ⭐ | O ⭐ | 55.1 | 54 | Women Popular |
| 7.5 ⭐ | P ⭐ | 56.3 | 55 | Women Popular |
| 8 | Q | 57.6 | 57 | Slim Men |
| 8.5 | R | 58.9 | 58 | Lean Men |
| 9 | S | 60.2 | 60 | Avg Slim Men |
| 9.5 ⭐ | T ⭐ | 61.4 | 61 | Men's Average ⭐ |
| 10 ⭐ | U ⭐ | 62.7 | 63 | Men Popular |
| 10.5 ⭐ | V ⭐ | 64.0 | 64 | Men Popular |
| 11 | W | 65.3 | 65 | Athletic Men |
| 11.5 | X | 66.6 | 67 | Broad Men |
| 12 | Y | 67.8 | 68 | Large Build |
| 12.5 | Z | 68.5 | 69 | XL Build |
| 13 | Z+1 | 69.7 | 70 | XL Custom |
| 13.5 | Z+2 | 72.3 | 72 | Custom |
| 🇨🇦 CA / 🇺🇸 US | 🇬🇧 UK Size | Circ. (mm) | Diam. (mm) | Circ. (cm) | Circ. (inches) | 🇪🇺 EU Size | Best For |
|---|---|---|---|---|---|---|---|
| 1 | B | 39.1 mm | 12.3 mm | 3.91 cm | 1.539″ | 38 | Children / XS |
| 1.5 | C | 40.4 mm | 12.7 mm | 4.04 cm | 1.590″ | 40 | XS Women |
| 2 | D | 41.7 mm | 13.1 mm | 4.17 cm | 1.642″ | 41 | Small Women |
| 2.5 | E | 42.9 mm | 13.5 mm | 4.29 cm | 1.689″ | 42 | Small Women |
| 3 | F | 44.2 mm | 13.9 mm | 4.42 cm | 1.740″ | 43 | Small Women |
| 3.5 | G | 45.5 mm | 14.3 mm | 4.55 cm | 1.791″ | 45 | Women |
| 4 | H | 46.8 mm | 14.7 mm | 4.68 cm | 1.843″ | 46 | Women |
| 4.5 | I | 48.0 mm | 15.1 mm | 4.80 cm | 1.890″ | 47 | Women |
| 4.75 | J | 48.7 mm | 15.5 mm | 4.87 cm | 1.917″ | 48 | Women |
| 5 | K | 50.0 mm | 15.9 mm | 5.00 cm | 1.969″ | 49 | Women |
| 5.5 | L | 51.2 mm | 16.3 mm | 5.12 cm | 2.016″ | 50 | Women |
| 6 | M | 52.5 mm | 16.7 mm | 5.25 cm | 2.067″ | 51 | Women |
| 6.5 ⭐ | N ⭐ | 53.8 mm | 17.1 mm | 5.38 cm | 2.118″ | 52 | Women's Avg ⭐ |
| 7 ⭐ | O ⭐ | 55.1 mm | 17.5 mm | 5.51 cm | 2.169″ | 54 | Women Popular |
| 7.5 ⭐ | P ⭐ | 56.3 mm | 17.9 mm | 5.63 cm | 2.217″ | 55 | Women Popular |
| 8 | Q | 57.6 mm | 18.2 mm | 5.76 cm | 2.268″ | 57 | Slim Men |
| 8.5 | R | 58.9 mm | 18.6 mm | 5.89 cm | 2.319″ | 58 | Lean Men |
| 9 | S | 60.2 mm | 19.1 mm | 6.02 cm | 2.370″ | 60 | Avg Slim Men |
| 9.5 ⭐ | T ⭐ | 61.4 mm | 19.56 mm | 6.14 cm | 2.417″ | 61 | Men's Avg ⭐ |
| 10 ⭐ | U ⭐ | 62.7 mm | 19.96 mm | 6.27 cm | 2.469″ | 63 | Men Popular |
| 10.5 ⭐ | V ⭐ | 64.0 mm | 20.37 mm | 6.40 cm | 2.520″ | 64 | Men Popular |
| 11 | W | 65.3 mm | 20.78 mm | 6.53 cm | 2.571″ | 65 | Athletic Men |
| 11.5 | X | 66.6 mm | 21.18 mm | 6.66 cm | 2.622″ | 67 | Broad Men |
| 12 | Y | 67.8 mm | 21.59 mm | 6.78 cm | 2.669″ | 68 | Large Build |
| 12.5 | Z | 68.5 mm | 21.79 mm | 6.85 cm | 2.697″ | 69 | XL Build |
| 13 | Z+1 | 69.7 mm | 22.20 mm | 6.97 cm | 2.744″ | 70 | XL Custom |
| 13.5 | Z+2 | 72.3 mm | 23.01 mm | 7.23 cm | 2.846″ | 72 | Custom |
Canadian ring sizes include half sizes (6, 6.5, 7, 7.5) and even quarter sizes (6.25, 6.75) at some retailers. The UK A–Z system effectively has one letter per half US/CA size — so every Canadian half size corresponds precisely to a distinct UK letter size. Do not round CA 6.5 to CA 7 when ordering from a UK jeweller — the half-size difference equals one full UK letter size (e.g. CA 6 = UK M, CA 6.5 = UK N), which can mean the difference between a well-fitting and a slightly loose ring.
Quarter sizes: CA 6.25 falls between UK M and UK N — order UK N (the next size up) to ensure the ring is not too tight. CA 6.75 falls between UK N and UK O — order UK O for the same reason. When in doubt between two UK sizes — always select the larger letter size.
Step 1: Find your Canadian ring size using a CA ring sizer or by measuring your finger circumference in mm.
Step 2: Use the conversion chart above or the calculator to find your exact UK letter equivalent.
Step 3: When ordering from a UK retailer — select the UK letter size directly. Most UK jewellers (Goldsmiths, Beaverbrooks, H.Samuel, Ernest Jones) label their rings in UK letters A–Z+2.
Step 4: If ordering online and the ring will be shipped internationally — confirm the retailer's international return/resize policy before purchasing. Most major UK jewellers offer free resizes within 28–30 days of purchase for UK delivery addresses.
Step 5: For international orders shipped to Canada — confirm whether the retailer offers international resize or returns before purchasing, as policies vary by retailer.