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RingSizeConvert.com

International Ring Size Chart & Conversion Table

Compare US/Canada, UK/Australia, EU, Germany, and Japan ring sizes side-by-side, with the exact inner diameter and circumference in millimeters and inches for every size.

Interactive tools:Ring Fit Advisor (between sizes, band width & knuckle fit) →|Smart Ring Fit Advisor (Oura, Galaxy, RingConn & more) →|Universal ring size converter →|Ring size calculator (finger measurement) →

Prefer a print-optimized layout? Use the printable ring size chart instead.

Full ring size conversion chart

Every size in our verified dataset, sorted smallest to largest.

Ring size conversion chart
US / CanadaUS, CA, MXUK / AustraliaUK, IE, AU, NZ, ZAEUEU, FR, AT, BE, DK, SE, NO, FIGermany / NetherlandsDE, NLTurkeyTRJapanJP, CN, KR, HK, SGIndia (BlueStone)INIndia (Jewelove)India (VowJewels)India (The Vedic Crystals)Diameter (mm)Circumference (mm)
US / CanadaUS, CA, MX3UK / AustraliaUK, IE, AU, NZ, ZAFEUEU, FR, AT, BE, DK, SE, NO, FI44Germany / NetherlandsDE, NL14TurkeyTR4.2JapanJP, CN, KR, HK, SG4India (BlueStone)IN4.2India (Jewelove)4.2India (VowJewels)4India (The Vedic Crystals)5Diameter (mm)14.07Circumference (mm)44.2
US / CanadaUS, CA, MX3.5UK / AustraliaUK, IE, AU, NZ, ZAGEUEU, FR, AT, BE, DK, SE, NO, FI45.5Germany / NetherlandsDE, NL14.5TurkeyTR5.49JapanJP, CN, KR, HK, SG6India (BlueStone)IN5.49India (Jewelove)5.49India (VowJewels)5India (The Vedic Crystals)6Diameter (mm)14.48Circumference (mm)45.49
US / CanadaUS, CA, MX4UK / AustraliaUK, IE, AU, NZ, ZAHEUEU, FR, AT, BE, DK, SE, NO, FI47Germany / NetherlandsDE, NL15TurkeyTR6.75JapanJP, CN, KR, HK, SG7India (BlueStone)IN6.75India (Jewelove)6.75India (VowJewels)6India (The Vedic Crystals)7Diameter (mm)14.88Circumference (mm)46.75
US / CanadaUS, CA, MX4.5UK / AustraliaUK, IE, AU, NZ, ZAIEUEU, FR, AT, BE, DK, SE, NO, FI48Germany / NetherlandsDE, NL15.5TurkeyTR8.03JapanJP, CN, KR, HK, SG8India (BlueStone)IN8.03India (Jewelove)8.03India (VowJewels)7India (The Vedic Crystals)8Diameter (mm)15.29Circumference (mm)48.03
US / CanadaUS, CA, MX5UK / AustraliaUK, IE, AU, NZ, ZAJ½EUEU, FR, AT, BE, DK, SE, NO, FI49.5Germany / NetherlandsDE, NL15.5TurkeyTR9.32JapanJP, CN, KR, HK, SG9India (BlueStone)IN9.32India (Jewelove)9.32India (VowJewels)8India (The Vedic Crystals)9Diameter (mm)15.7Circumference (mm)49.32
US / CanadaUS, CA, MX5.5UK / AustraliaUK, IE, AU, NZ, ZAK½EUEU, FR, AT, BE, DK, SE, NO, FI50.5Germany / NetherlandsDE, NL16TurkeyTR10.58JapanJP, CN, KR, HK, SG10India (BlueStone)IN10.58India (Jewelove)10.58India (VowJewels)9India (The Vedic Crystals)10Diameter (mm)16.1Circumference (mm)50.58
US / CanadaUS, CA, MX6UK / AustraliaUK, IE, AU, NZ, ZAL½EUEU, FR, AT, BE, DK, SE, NO, FI52Germany / NetherlandsDE, NL16.5TurkeyTR11.87JapanJP, CN, KR, HK, SG11India (BlueStone)IN11.87India (Jewelove)11.87India (VowJewels)10India (The Vedic Crystals)11Diameter (mm)16.51Circumference (mm)51.87
US / CanadaUS, CA, MX6.5UK / AustraliaUK, IE, AU, NZ, ZAM½EUEU, FR, AT, BE, DK, SE, NO, FI53Germany / NetherlandsDE, NL17TurkeyTR13.16JapanJP, CN, KR, HK, SG13India (BlueStone)IN13.16India (Jewelove)13.16India (VowJewels)11India (The Vedic Crystals)12Diameter (mm)16.92Circumference (mm)53.16
US / CanadaUS, CA, MX7UK / AustraliaUK, IE, AU, NZ, ZAN½EUEU, FR, AT, BE, DK, SE, NO, FI54.5Germany / NetherlandsDE, NL17.5TurkeyTR14.41JapanJP, CN, KR, HK, SG14India (BlueStone)IN14.41India (Jewelove)14.41India (VowJewels)12India (The Vedic Crystals)13Diameter (mm)17.32Circumference (mm)54.41
US / CanadaUS, CA, MX7.5UK / AustraliaUK, IE, AU, NZ, ZAO½EUEU, FR, AT, BE, DK, SE, NO, FI55.5Germany / NetherlandsDE, NL17.5TurkeyTR15.7JapanJP, CN, KR, HK, SG15India (BlueStone)IN15.7India (Jewelove)15.7India (VowJewels)13India (The Vedic Crystals)14Diameter (mm)17.73Circumference (mm)55.7
US / CanadaUS, CA, MX8UK / AustraliaUK, IE, AU, NZ, ZAP½EUEU, FR, AT, BE, DK, SE, NO, FI57Germany / NetherlandsDE, NL18TurkeyTR16.99JapanJP, CN, KR, HK, SG16India (BlueStone)IN16.99India (Jewelove)16.99India (VowJewels)14India (The Vedic Crystals)15Diameter (mm)18.14Circumference (mm)56.99
US / CanadaUS, CA, MX8.5UK / AustraliaUK, IE, AU, NZ, ZAQ¼EUEU, FR, AT, BE, DK, SE, NO, FI58.5Germany / NetherlandsDE, NL18.5TurkeyTR18.25JapanJP, CN, KR, HK, SG17India (BlueStone)IN18.25India (Jewelove)18.25India (VowJewels)15India (The Vedic Crystals)16Diameter (mm)18.54Circumference (mm)58.25
US / CanadaUS, CA, MX9UK / AustraliaUK, IE, AU, NZ, ZAR½EUEU, FR, AT, BE, DK, SE, NO, FI59.5Germany / NetherlandsDE, NL19TurkeyTR19.53JapanJP, CN, KR, HK, SG18India (BlueStone)IN19.53India (Jewelove)19.53India (VowJewels)16India (The Vedic Crystals)17Diameter (mm)18.95Circumference (mm)59.53
US / CanadaUS, CA, MX9.5UK / AustraliaUK, IE, AU, NZ, ZAS½EUEU, FR, AT, BE, DK, SE, NO, FI61Germany / NetherlandsDE, NL19.5TurkeyTR20.79JapanJP, CN, KR, HK, SG19India (BlueStone)IN20.79India (Jewelove)20.79India (VowJewels)17India (The Vedic Crystals)18Diameter (mm)19.35Circumference (mm)60.79
US / CanadaUS, CA, MX10UK / AustraliaUK, IE, AU, NZ, ZAT½EUEU, FR, AT, BE, DK, SE, NO, FI62Germany / NetherlandsDE, NL20TurkeyTR22.08JapanJP, CN, KR, HK, SG20India (BlueStone)IN22.08India (Jewelove)22.08India (VowJewels)18India (The Vedic Crystals)19Diameter (mm)19.76Circumference (mm)62.08
US / CanadaUS, CA, MX10.5UK / AustraliaUK, IE, AU, NZ, ZAU½EUEU, FR, AT, BE, DK, SE, NO, FI63.5Germany / NetherlandsDE, NL20TurkeyTR23.37JapanJP, CN, KR, HK, SG22India (BlueStone)IN23.37India (Jewelove)23.37India (VowJewels)19India (The Vedic Crystals)20Diameter (mm)20.17Circumference (mm)63.37
US / CanadaUS, CA, MX11UK / AustraliaUK, IE, AU, NZ, ZAV½EUEU, FR, AT, BE, DK, SE, NO, FI64.5Germany / NetherlandsDE, NL20.5TurkeyTR24.62JapanJP, CN, KR, HK, SG23India (BlueStone)IN24.62India (Jewelove)24.62India (VowJewels)20India (The Vedic Crystals)21Diameter (mm)20.57Circumference (mm)64.62
US / CanadaUS, CA, MX11.5UK / AustraliaUK, IE, AU, NZ, ZAW½EUEU, FR, AT, BE, DK, SE, NO, FI66Germany / NetherlandsDE, NL21TurkeyTR25.91JapanJP, CN, KR, HK, SG24India (BlueStone)IN25.91India (Jewelove)25.91India (VowJewels)21India (The Vedic Crystals)22Diameter (mm)20.98Circumference (mm)65.91
US / CanadaUS, CA, MX12UK / AustraliaUK, IE, AU, NZ, ZAX½EUEU, FR, AT, BE, DK, SE, NO, FI67Germany / NetherlandsDE, NL21.5TurkeyTR27.2JapanJP, CN, KR, HK, SG25India (BlueStone)IN27.2India (Jewelove)27.2India (VowJewels)22India (The Vedic Crystals)23Diameter (mm)21.39Circumference (mm)67.2
US / CanadaUS, CA, MX12.5UK / AustraliaUK, IE, AU, NZ, ZAY½EUEU, FR, AT, BE, DK, SE, NO, FI68.5Germany / NetherlandsDE, NL22TurkeyTR28.46JapanJP, CN, KR, HK, SG26India (BlueStone)IN28.46India (Jewelove)28.46India (VowJewels)23India (The Vedic Crystals)24Diameter (mm)21.79Circumference (mm)68.46
US / CanadaUS, CA, MX13UK / AustraliaUK, IE, AU, NZ, ZAZ½EUEU, FR, AT, BE, DK, SE, NO, FI69.5Germany / NetherlandsDE, NL22TurkeyTR29.74JapanJP, CN, KR, HK, SG27India (BlueStone)IN29.74India (Jewelove)29.74India (VowJewels)24India (The Vedic Crystals)25Diameter (mm)22.2Circumference (mm)69.74

Lower-confidence data — Japan, India (VowJewels), India (The Vedic Crystals) comes from a single published retailer source, or is known to drift by 1–2 sizes at the top of the range. Confirm with the retailer before ordering.

Rounded scale — Germany / Netherlands uses a coarser step than US half-sizes, so one value can cover two neighbouring US sizes. Check the millimeter columns when you need to tell them apart.

Quickly convert between any two systems

Not locked to a single pair — pick any two supported sizing systems and convert instantly.

Want every system at once instead of one pair? Try the international ring size hub — one known size converted across US, UK, EU, German, Turkish, Japanese, and Indian jeweler scales.

How to use this chart

  1. If you already know your size in any one system, find it in that column and read across the row for every equivalent size, plus the inner diameter and circumference in millimeters.
  2. If you don't know your size yet, measure an existing ring's inside diameter, or wrap a strip of paper or string around your finger for the circumference, then match that value to the closest row in the Diameter (mm) orCircumference (mm) column.
  3. If your measurement falls between two rows, you're between standard sizes — the ring size calculator will show you both neighboring sizes and guidance on which to choose based on band width.

Understanding the sizing systems

All four systems describe the same underlying inner diameter — they just express it on different scales.

US / Canada

A numeric scale (e.g. 7, 7.5, 8) where each whole size step corresponds to a fixed increase in inner diameter, per the US Bureau of Standards' historical sizing circular. This is the most common scale referenced by online US retailers.

UK / Australia

A letter-based scale (e.g. N, N½, O) also used in Ireland, Australia, New Zealand, and South Africa, where each letter step corresponds to a fixed increase in inner circumference per the British Standards sizing specification.

EU

The simplest system by definition: the EU/ISO size number equals the inner circumference in millimeters, rounded to the nearest half-millimeter.

Japan

A numeric scale distinct from the US/Canada one. Our values are corroborated across two independent sources but drift slightly at larger sizes, so treat Japan sizes as a close estimate rather than an exact match.

India doesn't have one single official ring sizing standard, so instead of guessing we include four separate brand-specific columns — Bluestone, Jewelove, VowJewels, and The Vedic Crystals — each matching that retailer's own published conversion. Pick the one that matches the jeweler you're buying from.

Unit relationships: mm, cm, and inches

Every size in this chart is anchored to a millimeter measurement, since that's the unit sizing standards are defined in. If you measured in a different unit, here's how they relate:

  • 1 centimeter (cm) = 10 millimeters (mm)
  • 1 inch (in) = 25.4 millimeters (mm)
  • Circumference = diameter × π (approximately 3.1416) — this is why both columns are shown directly in the chart, so you never need to calculate it by hand.

Prefer not to convert units yourself? The ring size calculator accepts mm, cm, or inches directly and handles the conversion for you.

How to measure your ring or finger

Diagram of a ring showing the inside diameter being measured
Measure the inside edge of the ring, not the outside — the inner diameter is what determines your size.

For step-by-step guidance on measuring an existing ring or your finger, plus common measuring mistakes to avoid, see the full step-by-step ring size measuring guide.

Country and brand size references

Use a retailer-specific chart only for that retailer. Each reference explains its source and measurement caveats.

Direct size guides & international conversions

Detailed millimeter dimensions, 1:1 scale visualizers, and brand translations for common sizes.

US Sizes in MM

International Conversions

UK & Millimeter Lookups

Frequently asked questions

How accurate are the sizes in this chart?

US/Canada, UK/Australia, and EU values are based on official sizing standards. Japan values are corroborated from two independent sources but drift slightly at larger sizes, so treat those as a close estimate rather than an exact match.

Why does India have multiple ring size options?

India doesn't have one single official ring sizing standard — different jewelers use different numbering conventions. Instead of guessing which one applies to you, this chart and calculator let you pick the specific brand convention (Bluestone, Jewelove, VowJewels, or The Vedic Crystals) that matches the retailer you're buying from.

What’s the actual difference between US, UK, and EU ring sizes?

They’re just different scales measuring the same inner diameter: US/Canada uses a numeric scale in roughly 0.8mm diameter steps, UK/Australia uses letters in circumference steps, and EU sizes equal the inner circumference in millimeters directly. The mm columns in this chart are what make them directly comparable.

Can I use this chart if I only have a measurement in cm or inches?

Yes — convert to millimeters first (1cm = 10mm, 1 inch = 25.4mm) and compare against the Diameter (mm) or Circumference (mm) column, or use the calculator to do the conversion and size lookup for you automatically.

Do ring size charts vary between jewelers?

US/Canada, UK/Australia, and EU have established sizing standards, while the Japan/East-Asia mapping is a close estimate in this chart. Individual jewelers or manufacturers can also round differently on their own printed charts. Always double-check against that specific retailer's chart before an important purchase.

Can I trust an online ring size chart for an engagement ring?

It's a solid starting point, but for a high-value or hard-to-resize purchase like an engagement ring, confirm the estimated size in person with the jeweler before buying.