The complete ring size guide for the UK 2026 — full A–Z+2 UK ring size chart with exact MM measurements, step-by-step home measurement guide using the paper method, UK to US/EU/Japanese/Australian size conversions, average UK ring sizes for men and women, wide band adjustment guide, and a free ring size calculator. Everything you need to find your correct UK ring size in one place.
The UK ring sizing system uses letters A through Z+2 — running from the smallest child-size (A = 37.8mm circumference) to the largest bespoke adult size (Z+2 = 71.0mm). Each UK letter represents approximately 1.25–1.3mm of circumference change. The most common UK women's ring size is UK M (52.5mm) and the most common men's ring size is UK T (61.4mm). The paper strip method is the most accurate way to measure at home — wrap a narrow strip around the base of the finger, mark the overlap, and measure in millimetres. The full A–Z+2 chart, free calculator, and conversion table are all below.
Cut a strip of paper approximately 5mm wide. Wrap it snugly around the base of your ring finger. Mark where the paper overlaps. Unroll and measure the marked length in millimetres against a ruler. Look up the nearest UK letter size in the chart below. Most accurate home method — repeat 3 times and average the results.
Wrap a thin piece of string or thread around the base of your finger. Mark the overlap point with a pen. Lay flat and measure in millimetres. Slightly less accurate than the paper method as thread can stretch, but effective as a backup. Use non-stretchy thread for best results.
Place a ring you already wear on that finger flat on a ruler. Measure the internal diameter in millimetres (inside edge to inside edge). Multiply by π (3.1416) to get the circumference, then look up your UK size in the chart. Most accurate when used with a ring that fits correctly on the exact same finger.
Visit any UK jeweller (H.Samuel, Beaverbrooks, Ernest Jones, Goldsmiths, or any independent) and ask to be sized with a ring mandrel and sizing gauge. Free of charge at all UK jewellers. This is the gold standard — the jeweller measures both the base of your finger and your knuckle, and recommends the correct UK size accounting for both measurements.
Many UK jewellers (Beaverbrooks, H.Samuel) offer a free printable ring sizer on their websites — a paper gauge you print, cut out, and wrap around your finger. Only accurate if your printer is set to 100% scale (no scaling to fit). Always verify scale accuracy with the printed ruler before using.
Several UK jewellers and third-party apps offer smartphone ring sizer tools. Place an existing correctly-fitting ring over the on-screen circle to identify your size. Accuracy varies by phone screen calibration. Use as a cross-reference only — not as a primary measurement method for high-value rings.
Do not measure first thing in the morning, after exercise, after cold water exposure, or in a cold room. All of these temporarily reduce finger size. Measure in a warm room (18–22°C) in the afternoon for the most representative daily finger size reading.
A receipt, magazine strip, or plain printer paper all work perfectly. The 5mm width is important — wider strips are harder to wrap evenly and give less consistent readings. Ensure the strip has smooth, straight edges so the measurement point is clearly visible.
Wrap the strip around the base of the finger where the ring will sit — not at the widest knuckle point. Snug but not tight — you should be able to slide a fingernail between the paper and the skin without force. Overlapping more than a few mm indicates the strip is too loose. Hold the overlap point firmly with a thumb and index finger.
Without moving your fingers, make a small pen mark where the leading edge of the paper overlaps the other end. Unroll the paper and lay it flat on a ruler. Measure from the cut end to the pen mark in millimetres. This number is your finger circumference in mm. Look it up in the chart below to find your UK letter size.
Measure three times in the same session and take the average circumference. Then wrap the paper strip around the widest point of the knuckle (the joint). If the knuckle measurement is more than 1 UK letter larger than the base measurement, note both readings — you will need to account for the knuckle size when choosing your final ring size.
Find your circumference in mm in the chart below. If your measurement falls exactly between two UK letters, choose the larger size for an all-day ring, or the smaller for an occasional-wear ring. If ordering a wide band (6mm+), add 1 UK letter to your measurement result — wide bands feel tighter than narrow rings at the same UK size due to greater surface contact with the finger.
| 🇬🇧 UK | Diam. (MM) | Circ. (MM) | 🇺🇸 US | 🇪🇺 EU | 🇯🇵 Japan | 🇦🇺 AU/NZ | Typically Worn |
|---|---|---|---|---|---|---|---|
| A | 11.9 | 37.8 | — | 38 | — | A | Child |
| B | 12.3 | 39.1 | — | 39 | — | B | Child |
| C | 12.7 | 40.4 | 1 | 40 | 1 | C | XS / Teen |
| D | 13.1 | 41.7 | 2 | 42 | 3 | D | XS Women |
| E | 13.5 | 43.0 | 2.5 | 43 | 5 | E | XS Women |
| F | 13.9 | 44.2 | 3 | 44 | 6 | F | Petite Women |
| G | 14.3 | 45.5 | 3.5 | 45 | 7 | G | Small Women |
| H | 14.7 | 46.8 | 4 | 47 | 8 | H | Small Women |
| I | 15.1 | 47.4 | 4.25 | 47 | 9 | I | Women |
| J | 15.5 | 48.7 | 4.625 | 49 | 10 | J | Women |
| K | 15.9 | 50.0 | 5.125 | 50 | 11 | K | Women |
| L ⭐ | 16.3 | 51.2 | 5.5 | 51 | 12 | L | Popular ♀ |
| M ⭐ | 16.7 | 52.5 | 6 | 53 | 13 | M | UK Avg ♀ ⭐ |
| N ⭐ | 17.1 | 53.8 | 6.5 | 54 | 14 | N | Popular ♀ |
| O | 17.5 | 55.1 | 7 | 55 | 15 | O | Unisex |
| P | 17.9 | 56.3 | 7.5 | 56 | 16 | P | Unisex |
| Q | 18.2 | 57.2 | 8 | 58 | 17 | Q | Slim Men |
| R | 18.6 | 58.9 | 8.625 | 59 | 18 | R | Men |
| S | 19.1 | 60.2 | 9.125 | 60 | 19 | S | Men |
| T ⭐ | 19.5 | 61.4 | 9.625 | 61 | 20 | T | UK Avg ♂ ⭐ |
| U ⭐ | 20.0 | 62.7 | 10.25 | 63 | 21 | U | Popular ♂ |
| V ⭐ | 20.3 | 64.0 | 10.625 | 64 | 22 | V | Popular ♂ |
| W | 20.7 | 65.3 | 11.125 | 65 | 23 | W | Large Men |
| X | 21.1 | 66.6 | 11.625 | 66 | 24 | X | Large Men |
| Y | 21.5 | 67.8 | 12 | 68 | 25 | Y | Large Men |
| Z | 21.8 | 68.5 | 12 | 69 | 26 | Z | XL Men |
| Z+1 | 22.2 | 69.7 | 12.5 | 70 | 27 | Z+1 | XL Custom |
| Z+2 | 22.6 | 71.0 | 13 | 72 | 28 | Z+2 | XXL Bespoke |
A wide ring band (6mm or more) has significantly greater surface contact with the finger than a narrow engagement ring band (2–3mm). This increased contact area creates more friction, making the ring feel 1 UK letter tighter than a narrow ring of the same size. When ordering a wedding band, always add 1 UK letter to your measured ring size. A 4–6mm medium band may also feel slightly tighter — some jewellers recommend +0.5 letters (i.e., choose the larger of two adjacent sizes).
| Band Width | Size Adjustment | Example | Ring Type |
|---|---|---|---|
| 1–3mm (narrow) | No adjustment | Measured UK M → order UK M | Engagement rings, eternity rings, thin fashion rings |
| 4–5mm (medium) | +0.5 letters (choose larger) | Measured UK M, between M&N → order UK N | Medium wedding bands, some signet rings |
| 6–8mm (wide) | +1 UK letter | Measured UK M → order UK N | Standard wedding bands, wide signet rings |
| 8mm+ (very wide) | +1–2 UK letters | Measured UK T → order UK U or UK V | Wide wedding bands, chunky signet rings, men's fashion rings |
How much ring resizing costs in the UK, which metals can be resized and by how many UK letters, the full step-by-step resizing process, and which rings cannot be resized. Free resize calculator.
Read the Resizing Guide →Why rings feel tight, 6 safe home removal methods, how to measure when fingers swell, when to go to A&E, and alternatives to resizing for tight rings. Free tight ring calculator.
Read the Tight Ring Guide →Why rings feel loose or spin, ring adjuster types and UK costs, when to use an adjuster vs resize down, spinning ring fixes, and how to measure for a snug fit. Free loose ring calculator.
Read the Loose Ring Guide →Everything to check before buying a ring online or in-store — size guarantees, return policies, free resize windows, how to measure a finger secretly for a surprise ring, and buying tips.
Read the Buying Guide →