UK Ring Size Chart (2026): Letters to mm, US & EU Conversions — Free PDF
⚡ Quick Answer: UK Ring Size System
UK ring sizes use letters: A (smallest) through Z+4 (largest). Average women’s UK size: L to N (US 6 to 7, inner diameter 16.3–17.3 mm). Average men’s: R to T (US 9 to 10). Australian ring sizes use the same letter system as the UK. UK sizes do not directly equal US numbers — always convert via inner diameter in mm.
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1. How the UK Ring Size System Works
- UK sizes use letters starting at A (approx. 13mm inner diameter) through Z, then Z+1, Z+2, Z+3, Z+4.
- Each full letter step = approximately 1.25mm circumference difference (0.4mm in diameter).
- The same system is used in Australia and the Republic of Ireland.
- No direct numerical equivalent — always convert via mm.
- UK sizes are stamped on hallmarked UK jewellery as a letter.
💡 UK vs. Australian Sizes
UK and Australian ring sizes are identical — both use the same alphabetical system with the same measurements. UK size L = Australian size L = US size 6. When shopping from an Australian jeweller, use this UK chart without any conversion.
2. Complete UK Ring Size Chart
| UK Size | Inner Diameter (mm) | Circumference (mm) | US Size | EU Size | Japanese |
|---|---|---|---|---|---|
| F | 14.0 | 44.0 | 3 | 44 | 4 |
| G | 14.4 | 45.1 | 3.5 | 45 | 5 |
| H | 14.8 | 46.5 | 4 | 46 | 6 |
| I | 15.3 | 48.0 | 4.5 | 48 | 7 |
| J | 15.7 | 49.3 | 5 | 49 | 9 |
| K | 16.1 | 50.6 | 5.5 | 51 | 10 |
| L | 16.3 | 51.2 | 5.75 | 51 | 11 |
| M | 16.5 | 52.0 | 6 | 52 | 12 |
| N | 16.9 | 53.1 | 6.5 | 53 | 13 |
| O | 17.3 | 54.5 | 7 | 54 | 14 |
| P | 17.8 | 55.8 | 7.5 | 56 | 15 |
| Q | 18.2 | 57.0 | 8 | 57 | 16 |
| R | 18.6 | 58.3 | 8.5 | 58 | 17 |
| S | 19.0 | 59.7 | 9 | 60 | 18 |
| T | 19.4 | 61.0 | 9.5 | 61 | 19 |
| U | 19.8 | 62.3 | 10 | 62 | 20 |
| V | 20.2 | 63.5 | 10.5 | 63 | 21 |
| W | 20.7 | 65.1 | 11 | 65 | 22 |
| X | 21.1 | 66.3 | 11.5 | 66 | 23 |
| Y | 21.5 | 67.5 | 12 | 67 | 24 |
| Z | 22.3 | 70.1 | 13 | 70 | 26 |
| Z+2 | 23.1 | 72.6 | 14 | 73 | 28 |
Bold = most common women’s (L–N) and men’s (R–T) UK ring sizes.
3. Most Common UK Ring Sizes
| UK Size | US Equivalent | Who Typically Wears This | Inner Diameter |
|---|---|---|---|
| J–K | 5 to 5.5 | Small women’s ring finger | 15.7–16.1 mm |
| L–M | 6 | Most common women’s size | 16.3–16.5 mm |
| N | 6.5 to 7 | Average women’s ring finger | 16.9 mm |
| O–P | 7.5 to 8 | Larger women’s / small men’s | 17.3–17.8 mm |
| R–S | 9 | Average men’s ring finger | 18.6–19.0 mm |
| T–U | 9.5 to 10 | Average men’s ring finger | 19.4–19.8 mm |
| V–X | 10.5 to 12 | Larger men’s | 20.2–21.1 mm |
4. Frequently Asked Questions
What is the average UK ring size for women?
The average women’s UK ring size is L to N, inner diameter approx. 16.3–16.9mm. UK size M is the most commonly purchased, equivalent to US size 6 and EU size 52.
What is the average UK ring size for men?
The average men’s UK ring size is R to T, inner diameter approx. 18.6–19.4mm. UK size S to T is the most commonly purchased range for men’s wedding bands.
How do I convert a US ring size to a UK size?
Use inner diameter in mm as your reference. Find your US size, note the inner diameter, find that value in the UK column. Example: US size 7 = 17.3mm = UK size N.
Are UK ring sizes the same as European sizes?
No. UK uses letters (L, M, N…) while EU uses numbers representing inner circumference in mm (EU 52, 53, 54…). UK size M = EU 52 = US size 6, all corresponding to inner diameter 16.5mm.
Tools & Downloads
Ring Size Calculator · UK Chart PDF · US Chart PDF · Full Conversion Chart · Measure at Home
Ring Size Calculator · UK Chart PDF · US Chart PDF · Full Conversion Chart · Measure at Home
FREE DOWNLOAD
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