Ring Size Chart UK - Ringchart.co.uk

Ring Size Chart UK – Complete A to Z+2 Guide 2026

The complete UK ring size chart — every size from A to Z+2, diameter & circumference in mm, US & EU conversions, average sizes for men & women, and how to measure at home accurately

🇬🇧 UK Sizes A – Z+2 📏 mm & Inches 🇺🇸 US Conversion 🇪🇺 EU Conversion ♀️ Women · ♂️ Men ✅ 2026 Updated

UK Ring Size Chart — How It Works

UK ring sizes are lettered A through Z+2, based on the inner circumference of the ring in millimetres. Each half-size step is approximately 0.4–0.6 mm in circumference. The average UK women's ring size is L–N and the average UK men's ring size is T–V. Knowing your exact diameter or circumference lets you find your letter size instantly using the chart below.

⭐ Women's Avg: L–N ⭐ Men's Avg: T–V 📏 Based on circumference 🇬🇧 Letters A–Z+2

L–N

💍 Average UK
Women's Ring Size

T–V

💍 Average UK
Men's Ring Size

A–Z+2

📊 Full UK Ring
Size Range

~0.5mm

📏 Circumference
Per Half Size Step

ℹ️

UK Ring Size Chart – Overview 2026

The UK ring sizing system uses letters from A to Z+2, where each letter corresponds to a specific inner circumference in millimetres. Unlike the US numeric system or the EU/ISO numeric system, UK sizes progress in small half-letter increments (e.g. L, L½, M, M½). This chart covers every UK ring size, its diameter and circumference in mm, plus conversions to US, EU, and Japanese sizes — making it the only ring size chart UK reference you need in 2026.

🧮 Ring Size Chart UK – Find Your Size Calculator

Enter your finger measurement to find your UK ring size instantly

Your UK Ring Size

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📊 Average UK Ring Size – Men & Women 2026

♀️ Women's Average Ring Size

L – N

The most common UK women's ring size is L½ to N, with M being the single most stocked size. This corresponds to a finger circumference of approximately 49–52 mm and a diameter of 15.7–16.6 mm. Ring finger sizes for women in the UK range from H (petite) to R (larger hands).

♂️ Men's Average Ring Size

T – V

The most common UK men's ring size is T to V, with T being the most stocked. This corresponds to a circumference of approximately 61–64 mm and a diameter of 19.6–20.4 mm. Men's sizes typically range from Q (slim) to Z+ (large build).

📋 Full Ring Size Chart UK – A to Z+2 (2026)

UK Size	Diam. (mm)	Circ. (mm)	🇺🇸 US Size	🇪🇺 EU / ISO	🇯🇵 Japan	Best For
A	11.9 mm	37.4 mm	—	37	—	Child / Pinky
B	12.3 mm	38.6 mm	—	39	—	Child / Pinky
C	12.7 mm	39.9 mm	—	40	—	Child
D	13.1 mm	41.1 mm	1.5	41	2	Child / XS
E	13.5 mm	42.5 mm	2.5	43	4	XS Women
F	13.9 mm	43.7 mm	3	44	5	XS Women
G	14.3 mm	44.9 mm	3.5	45	6	Small Women
H	14.7 mm	46.2 mm	4	46	7	Small Women
I	15.0 mm	47.1 mm	4.5	47	8	Small Women
J	15.3 mm	48.0 mm	5	48	9	Women
J½	15.5 mm	48.7 mm	5.25	49	9	Women
K	15.7 mm	49.3 mm	5.5	49	10	Women
K½	15.9 mm	49.9 mm	5.75	50	10	Women
L ⭐	16.1 mm	50.6 mm	6	51	11	Women's Popular
L½	16.3 mm	51.2 mm	6.25	51	12	Women's Popular
M ⭐	16.5 mm	51.9 mm	6.5	52	12	Most Common ⭐
M½	16.7 mm	52.5 mm	6.75	53	13	Women's Popular
N ⭐	16.9 mm	53.1 mm	7	53	13	Most Common ⭐
N½	17.1 mm	53.8 mm	7.25	54	14	Women's Popular
O	17.3 mm	54.4 mm	7.5	54	14	Women / Unisex
O½	17.5 mm	55.0 mm	7.75	55	15	Women / Unisex
P	17.8 mm	55.9 mm	8	56	15	Unisex
P½	18.0 mm	56.5 mm	8.25	57	16	Unisex
Q	18.2 mm	57.2 mm	8.5	57	16	Slim Men
Q½	18.4 mm	57.8 mm	8.75	58	17	Slim Men
R	18.6 mm	58.5 mm	9	59	18	Men
R½	18.8 mm	59.1 mm	9.25	59	18	Men
S	19.0 mm	59.7 mm	9.5	60	19	Men
S½	19.2 mm	60.3 mm	9.75	60	19	Men
T ⭐	19.56 mm	61.4 mm	10	61	20	Men's Most Common ⭐
T½	19.76 mm	62.1 mm	10.25	62	21	Men's Popular
U ⭐	19.96 mm	62.7 mm	10.5	63	21	Men's Most Common ⭐
U½	20.17 mm	63.4 mm	10.75	63	22	Men's Popular
V ⭐	20.37 mm	64.0 mm	11	64	22	Men's Popular
V½	20.57 mm	64.6 mm	11.25	65	23	Men
W	20.78 mm	65.3 mm	11.5	65	23	Men
X	21.18 mm	66.6 mm	12	67	24	Large Men
Y	21.59 mm	67.8 mm	12.5	68	25	Large Men
Z	21.99 mm	69.1 mm	13	69	26	XL Men
Z+1	22.20 mm	69.7 mm	13.5	70	27	XL / Custom
Z+2	23.01 mm	72.3 mm	14	72	28	Custom

⭐ UK M = most common women's ring size

⭐ UK T = most common men's ring size

📏 Sizes based on inner circumference in mm

🇬🇧 UK half-sizes (e.g. L½) are widely stocked

📏 How to Measure Ring Size at Home – UK Guide

📜

Paper Strip Method

Cut a thin strip of paper, wrap it around the base of your finger, mark where it overlaps, and measure the length in mm. That is your circumference — look it up in the chart above.

🧵

String / Thread Method

Wrap a piece of string or thread around your finger, mark the overlap point, then lay it flat against a ruler to measure in mm. Works well for measuring knuckle size too.

💍

Existing Ring Method

Place an existing ring flat on a ruler and measure the inner diameter in mm. Match the diameter to the ring size chart above to find your UK letter size instantly.

🖨️

Printable Sizer

Many UK jewellers — including H.Samuel, Beaverbrooks, and Ernest Jones — offer free printable ring sizer cards. Print at 100% scale, cut out the strip, and slot through the tab to find your size.

🏪

In-Store Measurement

The most accurate method. Any UK jeweller will size your finger for free using metal ring gauges. Recommended for engagement rings, wedding bands, or any ring costing over £100.

📐

Digital Calliper

Use a digital calliper to measure your finger's diameter directly in mm for the highest accuracy. Ideal if you already have one at home, or borrow one from a hardware store.

🔢 Step-by-Step: How to Find Your UK Ring Size

Choose the correct finger & hand

Measure the exact finger you plan to wear the ring on. In the UK, engagement rings and wedding bands are traditionally worn on the left ring finger. Eternity rings and fashion rings can be worn on any finger.

Wrap paper or string around the base of the finger

Use a strip of non-stretchy paper or thin string. Wrap it snugly around the base of your finger — not too tight, not too loose. It should slide over your knuckle with slight resistance.

Mark and measure in millimetres

Mark the exact point where the paper or string overlaps. Lay it against a mm ruler and measure the length. This is your inner circumference in mm.

Look up your UK ring size in the chart

Find your circumference measurement in the Circ. (mm) column of the full UK ring size chart above. The corresponding letter in the first column is your UK ring size.

Account for knuckle size & band width

If your knuckle is noticeably wider than the base of your finger, size up by half a UK letter. If ordering a wide band (6 mm+), also size up by half a letter to account for extra compression.

Measure 2–3 times for accuracy

Always measure at least twice and take the average. Measure at different times of day if possible. If you are between two sizes, always choose the larger UK size — a slightly loose ring is safer than one that won't go on.

🔣 Ring Size Conversion Formulas – UK Chart

Diameter → Circumference

Circumference (mm) = Diameter (mm) × π (3.14159)

Example: 16.5 mm diameter × 3.14159 = 51.8 mm circumference = UK M

Circumference → Diameter

Diameter (mm) = Circumference (mm) ÷ π (3.14159)

Example: 61.4 mm ÷ 3.14159 = 19.55 mm diameter = UK T

Inches → mm Circumference

Circumference (mm) = Inches × 25.4

Example: 2.04 inches × 25.4 = 51.8 mm = UK M (women's average)

UK to US Approximate Conversion

US Size ≈ (UK circumference mm − 36.5) ÷ 2.555

Example: UK T (61.4 mm) → (61.4 − 36.5) ÷ 2.555 ≈ US 9.75 (~US 10)

💡 UK Ring Sizing Tips – Common Mistakes to Avoid

⚠️Don't measure in cold weather. Fingers can shrink by up to a full UK size in very cold temperatures. Always measure when your hands are warm and at a normal room temperature.
📏Measure the knuckle too. If your knuckle is wider than the base of your finger, the ring must pass over the knuckle. Size for the knuckle, then check if the ring will be loose at the base — a ring adjuster can fix this.
💍Wide bands need a larger size. A 6 mm or wider band compresses the finger more than a narrow band. Size up by ½ a UK letter for 6–7 mm bands, and 1 full letter for 8–10 mm bands.
🔄Right hand vs left hand. Your dominant hand is typically ½ a UK size larger. If you measure your right hand but plan to wear the ring on your left, adjust accordingly.
🌡️Fingers swell throughout the day. Fingers are smallest in the morning and largest in the evening. Measure at the end of the day for the most realistic everyday fit.
🔁When between sizes, go larger. In the UK, most jewellers can resize a ring down more easily than up. If you are between L and M, order M — it is much easier to tighten a slightly loose ring than to stretch a tight one.

💍 Can UK Rings Be Resized?

Most UK gold, silver, and platinum rings can be resized by a jeweller — typically by 1–2 UK sizes up or down. However, rings with full-circumference gemstone settings (eternity rings), tungsten carbide rings, and titanium rings cannot be resized. Always get professionally measured before ordering these ring types. Standard resizing at a UK jeweller typically costs £20–£60 depending on the metal and extent of resizing required.

🔗 Related UK Ring Size Guides

📌 Related Pages on This Site

💍 Men's Engagement Ring Size Guide UK 💒 Wedding Ring Size Chart UK ♀️ Women's Ring Size Guide UK 🔄 Ring Size Conversion Chart (US / EU / UK)

🌐 Official UK Jeweller Resources

📐 Beaverbrooks Ring Size Guide 📐 H.Samuel Ring Size Chart 📐 Ernest Jones Ring Size Guide

❓ Ring Size Chart UK – Frequently Asked Questions

What is the average UK ring size for women? ▼

The average UK women's ring size is L½ to N, with M being the single most commonly stocked size in UK jewellers. This corresponds to an inner circumference of approximately 51–53 mm and a diameter of 16.3–16.9 mm. However, sizes can vary considerably — petite women may wear H–J, while larger-handed women may wear P–R.

What is the average UK ring size for men? ▼

The average UK men's ring size is T to V, with T (circumference 61.4 mm, diameter 19.56 mm) being the most commonly stocked single men's size. Most UK adult men fall between size Q (slim build) and Z (large build). Men's ring sizes are significantly larger than women's because of broader fingers and hands.

How do I convert my UK ring size to US? ▼

UK and US ring sizes use completely different systems — UK uses letters (A–Z+2) and US uses numbers (0–16). The easiest way to convert is to use the circumference in mm as the common reference. For example, UK M (51.9 mm circumference) = approximately US 6.5. The full US conversion is shown in the ring size chart above for every UK letter size.

Is UK ring sizing the same as Irish ring sizing? ▼

Yes — Ireland uses the same ring sizing system as the United Kingdom, with lettered sizes from A to Z+2 based on inner circumference in millimetres. You can use the same UK ring size chart for buying rings in both the UK and the Republic of Ireland.

What if I am between two UK ring sizes? ▼

If you are between two UK sizes, always choose the larger size. A slightly loose ring is safer, more comfortable, and easier to fix — jewellers can add sizing beads or a ring adjuster for a small fee. A ring that is too small is uncomfortable, can cut off circulation, and is harder and more expensive to resize. Most UK jewellers offer half-sizes (e.g. M½, N½) which reduces the chance of being caught between sizes.

Does temperature affect ring size? ▼

Yes — fingers can vary by up to 1 full UK letter size between very cold and very warm conditions. Fingers shrink in cold weather and swell in heat, during exercise, and towards the end of the day. For the most accurate ring size, measure your finger in the evening, at room temperature, after the hands have warmed up. Avoid measuring first thing in the morning or after coming in from the cold.

How accurate is the paper strip method for UK ring sizing? ▼

The paper strip method is accurate to within approximately ½ a UK ring size when done carefully. Use non-stretchy paper, mark cleanly, and measure with a mm ruler. It is accurate enough for most fashion rings and costume jewellery. For engagement rings, wedding bands, or rings costing over £100, always get professionally measured at a jeweller using metal ring gauges for the most precise result.