Featured
6 min read
How to Measure Your Ring Size at Home: The Complete Guide
Learn accurate ways to measure your ring size at home using an app, printable chart, or string method.
Read more →
Reference
5 min read
The Ultimate Ring Size Guide: Conversion Chart Across Countries
Convert ring sizes between US, UK, EU, JP, and more. Includes an app to measure on your phone.
Engagement
7 min read
How to Find Your Partner's Ring Size Without Them Knowing
7 secret ways to measure your partner's ring size for a surprise engagement ring — no jeweler visit needed.
Guide
5 min read
Men's Ring Size Guide: Chart, Average Sizes & How to Measure
Complete men's ring size guide with conversion chart, average sizes by build, and tips for wide bands.
Tools & Converters
US to UK Ring Size Converter
Full chart with half sizes. Convert US 3–13 to UK F–Z+.
EU to US Ring Size Converter
European to American size chart. EU 44–70 to US 3–13.
Ring Size Letters to Numbers
UK letters (A–Z) to US numbers (1–13). Complete reference.
Japanese to US Ring Size Converter
JP 1–33 to US 3–13 with diameter cross-checks.
Ring Circumference to Size
Convert mm circumference to US, UK, EU, and JP sizes.
Ring Size Calculator
Enter any measurement, get your size in all global systems.
US to EU Ring Size Converter
Convert American ring sizes to European EU sizes. Full chart US 3-13 to EU 44-70.
Indian to US Ring Size Converter
Convert Indian ring sizes 1-36 to US sizes. Full chart with diameter cross-checks.
Ring Sizes by Country
United States
US 3–16 numeric
United Kingdom
UK A–Z letters
Germany
EU circumference mm
Japan
JP 1–33 numeric
Australia
UK letter system
India
Indian 1–36 numeric
France
EU circumference mm
Italy
EU circumference mm
Canada
US numeric system
Brazil
Brazilian 6–33
South Korea
KS diameter mm
Spain
EU circumference mm
Netherlands
EU circumference mm
New Zealand
UK letter system
Saudi Arabia
EU & Indian systems
China
HK & mainland systems
Russia
Diameter mm system
Mexico
US numeric system
Switzerland
EU/ISO circumference
Ireland
UK letter system
Size Comparisons
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US vs UK Ring Sizes
Numbers vs letters, conversion shortcuts, and buying tips.
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US vs EU Ring Sizes
Numbers vs millimeters — full comparison chart.
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Asian vs US Ring Sizes
Japan, China & India compared to American sizes.
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UK vs EU Ring Sizes
Letters vs millimeters — side-by-side conversion chart.
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US vs Japanese Ring Sizes Compared
Compare US numeric and JP 1-33 ring sizes side by side. Full conversion chart.
Sizing Guides
Guide
6 min read
How to Measure Ring Size with Your Phone
Place an existing ring on your screen and get instant results with the Ring Sizer app.
Gift Guide
7 min read
Ring Sizing for Gift Buyers
7 discreet ways to find someone's ring size for a surprise gift.
Guide
6 min read
Wide Band Ring Sizing
Wider bands fit tighter. Learn how much to size up and when comfort fit helps.
Guide
7 min read
Ring Resizing Limits
Most rings can be resized 1–2 sizes. Learn the limits by metal and design type.
Guide
7 min read
Between Ring Sizes?
How to decide: size up, size down, or use adjusters when you fall between sizes.
Guide
7 min read
Ring Size Accuracy Tips
Time of day, temperature, and hand dominance all affect your measurement.
Guide
6 min read
How to Measure Ring Size with String
Step-by-step string method for measuring ring size at home. Conversion chart included.
Guide
6 min read
Ring Size for Swollen Fingers
How to get the right ring fit when fingers swell from heat, pregnancy, or arthritis.
Glossary
Ring Size
What ring size means, how it's measured, and why it differs by country.
Comfort Fit
Rounded interior band that slides easily over knuckles. How it affects sizing.
Inside Diameter
The universal measurement (mm) that converts to every ring size system.
Ring Mandrel
Tapered metal rod used by jewelers to measure and shape rings.
Half Sizes
Why half sizes matter for a better fit. Which sizing systems support them.
Band Width
How ring width affects sizing — wider bands fit tighter.
Ring Gauge
Set of metal rings for measuring finger size. Types and best practices.
Sizing Beads
Small metal bumps soldered inside a ring to adjust fit without resizing.
Ring Shank
The shank is the band that wraps around your finger. Types and how they affect size.
