Ring Size Chart – Complete US, UK, EU & International Size Guide

Ring Size Chart Full Guide

Complete ring size chart with US, UK, EU, Japan and international conversions — plus diameter, circumference measurements and a free ring size calculator

🇺🇸 US Sizes 3–13 🇬🇧🇦🇺 UK / AU Sizes 🇪🇺 EU Sizes 44–69 🇯🇵 Japan Sizes 📐 MM Diameter & Circumference

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6–6.5

Average US
Women's Size

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L–N

Average UK / AU
Women's Size

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16.5mm

Average Ring
Finger Diameter

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9–10

Average US
Men's Size

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What Is the Most Common Ring Size?

The most common ring size for women worldwide is US size 6 (UK L½ / EU 52 / diameter 16.5 mm). For men, the most common size is US size 9–10 (UK R½–T½ / EU 59–63 / diameter 18.9–19.8 mm). If you are buying a surprise ring and do not know the size, size 6 for women and size 9 for men are the safest starting points globally.

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How to Measure Your Ring Size at Home

Method 1 — String or Paper Strip (Most Accurate)

Cut a thin strip of paper or string

Cut a strip of paper approximately 10 mm wide and 100 mm long, or use a thin piece of non-stretchy string. Avoid stretchy materials as they give inaccurate readings.

Wrap snugly around your finger

Wrap the strip around the base of the finger you want to size — usually the ring finger on your left hand. The strip should sit snugly but still be able to slide over your knuckle comfortably.

Mark the overlap and measure

Mark where the strip overlaps with a pen. Lay flat and measure in millimetres from the end to the mark. This measurement is your finger circumference in mm.

Find your size in the chart below

Match your circumference measurement in the full ring size chart below to find your US, UK, EU, and Japanese ring size. If between sizes, always go up to the next half size for comfort.

Method 2 — Existing Ring (Diameter Method)

Place a ring flat on a ruler

Take a ring that already fits well on the finger you want to size. Place it flat on a ruler or measure across the inside of the ring (not the outside) in millimetres.

Match diameter to the chart

The measurement you take is the internal diameter in mm. Find this value in the diameter column of the full ring size chart below to identify your ring size in any international standard.

🌙 Measure in the evening when fingers are at their largest

🌡️ Avoid measuring when very cold as fingers shrink

💡 Measure 2–3 times and take the average for accuracy

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Ring Size Formulas

Circumference to Diameter

Diameter (mm) = Circumference (mm) ÷ 3.1416

Example: 52 mm circumference ÷ 3.1416 = 16.55 mm diameter → US size 6

Diameter to Circumference

Circumference (mm) = Diameter (mm) × 3.1416

Example: 16.5 mm diameter × 3.1416 = 51.84 mm circumference → US size 6

US to EU Conversion

EU Size = (US Size × 2) + 40.4 (approximate)

Example: US size 6 = (6 × 2) + 40.4 = 52.4 → rounds to EU 52

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Ring Size Calculator

Enter your finger measurement to find your ring size in all international standards

Your Ring Size

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Complete Ring Size Chart — US, UK, EU, Japan

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Popular Women's Range: US 5–8 | Popular Men's Range: US 8–12

The highlighted rows below represent the most commonly purchased ring sizes worldwide. Women's popular range is US 5–8 (UK J½–P½) and men's popular range is US 8–12 (UK P½–Z). Sizes outside these ranges are available from specialist jewellers.

🇺🇸 US Size	🇬🇧🇦🇺 UK / AU	🇪🇺 EU Size	🇯🇵 Japan	Diameter (mm)	Circumference (mm)	Typical Fit
3	F	44	4	14.1 mm	44.2 mm	Petite
3.5	G	45.5	5.5	14.5 mm	45.5 mm	Petite
4	H	46.5	7	14.9 mm	46.8 mm	Small
4.5	I½	47.8	8	15.3 mm	48.0 mm	Small
5 ⭐	J½	49	9.25	15.7 mm	49.3 mm	Women ♀
5.5	K½	50.5	10.5	16.1 mm	50.6 mm	Women ♀
6 🏆	L½	52	12	16.5 mm	51.9 mm	Most Common ♀
6.5	M½	53	13	16.9 mm	53.1 mm	Most Common ♀
7 ⭐	N½	54	14.5	17.3 mm	54.4 mm	Women ♀
7.5	O½	56	16	17.7 mm	55.7 mm	Women ♀
8	P½	57	17	18.1 mm	57.0 mm	Women / Men
8.5	Q½	58	18.5	18.5 mm	58.3 mm	Men ♂
9 🏆	R½	59.5	19.75	18.9 mm	59.5 mm	Most Common ♂
9.5	S½	61	21	19.4 mm	60.8 mm	Most Common ♂
10 ⭐	T½	62.5	22.5	19.8 mm	62.1 mm	Men ♂
10.5	U½	63.5	24	20.2 mm	63.4 mm	Men ♂
11	V½	65	25.5	20.6 mm	64.7 mm	Men ♂
11.5	W½	66	27	21.0 mm	65.9 mm	Men ♂
12	X½	67	28.5	21.4 mm	67.2 mm	Large
12.5	Y½	68.5	30	21.8 mm	68.5 mm	Large
13	Z½	69.5	31	22.2 mm	69.7 mm	XL

🏆 US 6 = Most common women's ring size globally

🏆 US 9 = Most common men's ring size globally

💡 Highlighted rows = popular worldwide size ranges

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Average Ring Size by Country

Country / Region	Women's Avg	Men's Avg	US Equivalent (W)	Diameter (W)
🇺🇸 USA & Canada	US 6–6.5	US 9–10	6–6.5	16.5–16.9 mm
🇬🇧 United Kingdom	UK L–M	UK R–T	5.75–6.25	16.3–16.7 mm
🇦🇺 Australia	AU M–N	AU S–U	6.25–6.75	16.7–17.1 mm
🇪🇺 Continental Europe	EU 52–54	EU 59–63	6–6.75	16.5–17.1 mm
🇯🇵 Japan	JP 10–11	JP 17–19	5.25–5.5	15.9–16.1 mm
🇮🇳 India	US 5–6	US 8–9	5–6	15.7–16.5 mm
🌏 Asia (General)	US 4–6	US 7–9	4–6	14.9–16.5 mm

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Ring Size by Finger — Women & Men

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Thumb

7–9 ♀

UK: O–S

Widest finger on the hand. Thumb rings need to fit loosely enough to slide comfortably over the knuckle joint during normal hand movements.

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Index Finger

6–7 ♀

UK: L–O

Slightly larger than the ring finger. Index rings usually need to go up half a size compared to the ring finger size. Very popular for fashion rings.

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Middle Finger

6–7 ♀

UK: L–O

The largest of the three centre fingers. Usually similar in size to the index finger. Often used for statement and cocktail rings due to its prominent position.

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Ring Finger

5–7 ♀

UK: J–N

Most commonly sized finger. Average women's US 6, men's US 9. The standard finger for engagement rings and wedding bands worldwide on the left hand.

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Pinky Finger

3.5–5 ♀

UK: G–J

The smallest finger. Pinky rings are petite and may need a specialist jeweller for very small sizes below US 4. Popular for signet rings and stackable styles.

💡 Dominant hand fingers are typically ½ size larger

💡 Ring finger left hand is usually the smallest

💡 Men's sizes run approximately 3–4 US sizes larger than women's

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Factors That Affect Your Ring Size

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Temperature

Fingers swell in warm weather and shrink in cold. Measure at room temperature for the most accurate reading. Avoid measuring first thing in the morning or after exercise.

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Time of Day

Fingers are slightly larger in the evening due to daily activity and fluid accumulation. For the best fit, measure in the late afternoon or early evening for a comfortable all-day size.

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Weight Changes

Significant weight gain or loss affects ring size noticeably. A loss or gain of 10+ pounds can change ring size by a full half to one full size, particularly on the ring finger.

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Pregnancy

Fingers typically increase 1–2 ring sizes during pregnancy due to fluid retention. Remove rings early in pregnancy — before week 20 — to avoid them becoming stuck as swelling increases.

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Medications

Certain medications including steroids, hormone treatments, and blood pressure drugs can cause fluid retention that significantly increases finger size. Consult your doctor if you notice sudden swelling.

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Age

Ring size often increases with age as joints broaden and skin loses elasticity. Regular measurement is recommended every few years — especially for anyone who has had the same ring for 10+ years.

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Expert Ring Sizing Tips

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Measure your finger in the evening. Fingers reach their largest size in the evening after a full day of activity and slight fluid accumulation. Measuring in the morning can give a reading that is up to half a size smaller than your true comfortable fit size.
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If between sizes, always size up — never down. When your measurement falls between two ring sizes, always go to the larger size. A slightly loose ring is far more comfortable and easier to remove than a ring that is even slightly too tight on the knuckle.
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Measure the correct hand — dominant hand is larger. Your dominant hand (the hand you write with) is typically half a size larger than your non-dominant hand due to daily use and muscle development. Always measure the specific hand and finger you plan to wear the ring on.
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Wider bands need a larger size. Wide rings (6 mm or wider) feel tighter than narrow rings at the same numerical size because they press against more skin surface. For a band 6 mm or wider, size up by at least half a size from your standard measurement for a comfortable and wearable fit.
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Re-measure every few years. Ring size changes throughout life due to weight fluctuations, ageing, pregnancy, and hormonal changes. If a ring has been in a drawer for several years, always re-measure before wearing — a ring that fit perfectly 10 years ago may now be too tight or too loose to wear safely.
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A properly fitted ring should slide over the knuckle with slight resistance. The ring should pass over your knuckle with a small amount of resistance — not slip on freely and not require force to remove. If it comes off too easily it will be lost; if it requires force it is too small and will be uncomfortable.

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Frequently Asked Questions

What is the most common ring size for women? ▾

The most common ring size for women worldwide is US size 6 (UK L½, EU 52, diameter 16.5 mm, circumference 51.9 mm). Approximately 35% of all women's rings purchased are size 6. The popular women's range runs from US size 5 to US size 8, with sizes 6 and 6.5 together accounting for the majority of women's ring sales globally.

What is the most common ring size for men? ▾

The most common ring size for men is US size 9 to 10 (UK R½–T½, EU 59–63, diameter 18.9–19.8 mm). Men's ring sizes typically range from US 8 to US 12, with sizes 9, 9.5, and 10 being the most frequently purchased. Men's sizes run approximately 3 to 4 US sizes larger than women's sizes on average.

How do I convert UK ring sizes to US sizes? ▾

UK ring sizes use an alphabetical system (A through Z+) while US sizes use numbers (1 through 13+). To convert, use the chart above or as a quick reference: UK J½ = US 5, UK L½ = US 6, UK N½ = US 7, UK P½ = US 8, UK R½ = US 9, UK T½ = US 10. UK half-sizes fall between the full letter sizes and correspond to the half US size increments such as US 5.5 or 6.5.

How do I measure my ring size at home without tools? ▾

The easiest home method is the paper strip method. Cut a narrow strip of paper, wrap it snugly around the base of your finger past the knuckle, mark where it overlaps, then lay flat and measure in millimetres. Match this circumference to the chart above. Alternatively, use a string instead of paper. Always measure in the late afternoon when fingers are at their natural largest size for the most accurate result.

Should I size up or down if between sizes? ▾

Always size up to the next larger half size if you fall between two measurements. A ring that is slightly loose can be resized or have a ring guard fitted; a ring that is too tight is uncomfortable, restricts circulation, and can be very difficult or impossible to remove — especially if fingers swell in warm weather or during pregnancy. When in doubt, go bigger.

Can a ring be resized? ▾

Yes — most metal rings can be professionally resized by a jeweller by 1 to 2 full sizes up or down. Simple bands in gold, silver, and platinum are the easiest to resize. Rings with eternity settings, full-circle diamonds, or intricate engravings throughout are more difficult or impossible to resize without altering the design. Some speciality materials such as tungsten and titanium cannot be resized at all and must be replaced.

How accurate are online ring size charts? ▾

Online ring size charts are highly accurate when used correctly — the measurements in mm (diameter and circumference) are universal physical measurements that are identical worldwide. Conversion between systems (US, UK, EU, Japan) is standardised and reliable. The key variable is the accuracy of your own home measurement, which is why measuring 2 to 3 times and taking the average is always recommended before relying on any online chart.