Ring Size Chart & Converter
Find your ring size in seconds. Convert US, UK, EU and Japanese sizes, or measure with a ruler, your phone screen or a printable sizer.Find your size in seconds: convert, measure, or use your phone screen.
What do you know already?
Sizes from inside diameters measured in our factory. Home measuring is accurate to about half a size.
Get my suggested sizeYou wear a US 7. Bands under 6 mm fit true to size, so stay with US 7.
- UK & AustraliaUK
- N½
- Europe (ISO)EU
- 54
- JapanJapan
- 14
- Italy, Spain, SwitzerlandIT / CH
- 14
- Inside diameterDiameter
- 17.3 mm
- CircumferenceCircum.
- 54.35 mm
RingCatalog makes rings for brands and does not sell single rings. Take this size to any jeweller. Buying for a store?
Between two sizes? Choose the larger. Knuckle much bigger than the base of your finger? Pick a size between the two.
Match your screen to a bank card
Every screen is a different size. Hold any bank, ID or gift card against the screen and drag the slider until the outline matches the card's width.
Standard card: 85.60 × 53.98 mm (ISO 7810). We save this on this device only, so you won’t need to do it again. Never type in a card number.
Lay a ring that fits on the circle
Use a ring worn on the same finger. Resize the circle until its line sits just inside the ring's inner edge.
Not calibrated yet, so the circle assumes a typical screen. Do step 1 for an accurate size.
Accurate to about half a size. Nothing is uploaded.
Find their ring size without them knowing
Buying a gift or planning a proposal? Pick what you can get hold of. The most reliable options come first.
International ring size chart
| US & Canada | UK & Australia | Europe (ISO) | Italy, Spain, Switzerland | Japan | Hong Kong & China | Diameter mm | Diameter in | Circumference mm |
|---|---|---|---|---|---|---|---|---|
| 3 | F | 45 | 5 | 4 | 7 | 14.2 | 0.56 | 44.61 |
| 3½ | G | 46 | 6 | 5 | — | 14.6 | 0.57 | 45.87 |
| 4 | H | 47 | 7 | 7 | 9 | 14.9 | 0.59 | 46.81 |
| 4½ | I | 48 | 8 | 8 | — | 15.4 | 0.61 | 48.38 |
| 5 | J½ | 50 | 10 | 9 | 11 | 15.8 | 0.62 | 49.64 |
| 5½ | K½ | 51 | 11 | 10 | — | 16.2 | 0.64 | 50.89 |
| 6 | L½ | 52 | 12 | 12 | 13 | 16.5 | 0.65 | 51.84 |
| 6½ | M½ | 53 | 13 | 13 | — | 16.9 | 0.67 | 53.09 |
| 7 | N½ | 54 | 14 | 14 | 15 | 17.3 | 0.68 | 54.35 |
| 7½ | O½ | 56 | 16 | 15 | — | 17.8 | 0.70 | 55.92 |
| 8 | P½ | 57 | 17 | 16 | 17 | 18.3 | 0.72 | 57.49 |
| 8½ | Q½ | 59 | 19 | 17 | — | 18.7 | 0.74 | 58.75 |
| 9 | R½ | 60 | 20 | 18 | 20 | 19.0 | 0.75 | 59.69 |
| 9½ | S½ | 61 | 21 | 19 | — | 19.4 | 0.76 | 60.95 |
| 10 | T½ | 62 | 22 | 20 | 22 | 19.8 | 0.78 | 62.20 |
| 10½ | U½ | 64 | 24 | 22 | — | 20.3 | 0.80 | 63.77 |
| 11 | V½ | 65 | 25 | 23 | 24 | 20.7 | 0.81 | 65.03 |
| 11½ | W½ | 66 | 26 | 24 | — | 21.1 | 0.83 | 66.29 |
| 12 | X½ | 68 | 28 | 25 | 26 | 21.5 | 0.85 | 67.54 |
| 12½ | Z | 69 | 29 | 26 | — | 21.9 | 0.86 | 68.80 |
| 13 | Z+1 | 70 | 30 | 27 | 28 | 22.3 | 0.88 | 70.06 |
| 13½ | Z+2 | 71 | 31 | – | — | 22.7 | 0.89 | 71.31 |
| 14 | Z+3 | 73 | 33 | – | 30 | 23.1 | 0.91 | 72.57 |
Half sizes appear between rows when “All sizes” is on. Your converted size is highlighted. Japanese and Hong Kong sizes vary slightly by maker; “–” means that system has no matching size.
Women's ring sizes
Most women wear US 5 to 8. The most common size is about US 6 to 7 (16.5–17.3 mm).
Men's ring sizes
Most men wear US 8 to 12. The most common size is about US 9 to 10 (19.0–19.8 mm). Men's bands are often wide: size up half.
Selling rings? Put this size chart on your store, free.
Download it as PNG or PDF with your own logo and add it to your product pages. Fewer size returns, no design work.
Ring size FAQ
What is a size 7 ring in mm?
A US 7 has an inside diameter of about 17.3 mm and a circumference of about 54.35 mm. That is UK N½ and EU 54.
How can I find my ring size without a ruler?
Use the screen sizer above: calibrate with a bank card, then match a ring you already wear.
How do I convert EU ring sizes to US sizes?
The EU size is the inside circumference in millimetres, rounded to a whole number. EU 52 is about a US 6.
How do UK ring sizes compare to US sizes?
UK sizes use letters, about 1.25 mm of circumference each. US 5 is about J½, US 7 about N½.
Are men's and women's ring sizes the same?
Yes, there is one scale. Most women wear US 5 to 8 and most men US 8 to 12.
What if I am between two sizes?
Choose the larger one, especially for wide bands or a large knuckle.
Should I size up for a wide band?
Yes. Bands of 6 to 8 mm usually need half a size up; 8 mm and wider about a full size.
Can I buy a single ring from RingCatalog?
No. RingCatalog makes rings for brands and stores, from 100 pcs per design per colour. Use this tool for free and take your size to any jeweller.
How do I find a ring size for a gift?
Borrow a ring they wear on the same finger and measure it, or choose an adjustable open ring.