Ring & Shoe Size Converter: US, UK, EU, Japan & mm
Instantly convert ring sizes between US, UK, EU, Japanese, and millimeter systems. Also convert shoe sizes across US Men's, US Women's, UK, EU, and Japan. Includes a printable ring sizer you can use at home.
Convert Sizes
Enter Ring Size
Quick Select
Inner diameter:
17.35 mm
Circumference: 54.4 mm
Conversion Results
7
N
54
14
17.35
54.4
Printable Ring Sizer
Print at 100% scale (no fit-to-page). Place your ring over each circle — the one that fits inside the circle is your size.
Last updated: May 24 2026
Reviewed by the QuickTooly Team
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Ring & Shoe Size Guide
How to Measure Ring Size at Home
String or Paper Strip Method
Wrap a thin strip of paper or a piece of string around the base of your finger. Mark where it overlaps, then measure the length in mm — that's your inner circumference. Enter it in the "Inner Circumference (mm)" input above to find your size in all systems.
Existing Ring Method
Place an existing ring that fits well on a ruler and measure the inner diameter in mm. Use the "Inner Diameter (mm)" input to convert to any sizing system. Alternatively, use the Printable Ring Sizer above — print it at 100% scale and lay the ring flat on each circle until you find the matching size.
Tips for Accuracy
Fingers are larger in warm weather and swell slightly in the evening. Measure at the end of the day for the most accurate fit. If you are between sizes, size up for comfort. Wider bands typically need a half size larger than narrow bands.
How to Measure Shoe Size
Foot Tracing Method
Stand on a piece of paper with your heel against a wall. Trace the outline of your foot. Measure the longest distance from heel to toe in centimeters — that is your Japanese size (which equals foot length in cm). Enter that in the Japan (cm) input to see your US, UK, and EU equivalents.
US Men's vs US Women's
US Women's sizes run approximately 1.5 sizes larger than US Men's for the same foot length. A men's size 8 equals a women's size 9.5. When buying unisex shoes, women typically subtract 1.5 from their women's size.
Ring Size Systems Explained
US / Canada
Uses a numeric scale from 3 to 13 (with half sizes). Women commonly wear sizes 5–7; men commonly wear sizes 9–11. The most widely used system in North America.
UK / Australia
Uses an alphabetical scale (F through Z+). Each letter corresponds to a half-size increment. UK size N corresponds to US size 7.
Europe (EU / ISO)
EU sizes equal the inner circumference of the ring in millimeters. EU 54 = 54 mm inner circumference = US size 7. This is the most precise international standard.
Japan
Japanese ring sizes use a numeric scale starting at 1. Size 14 is equivalent to US size 7. Japan uses the same increments as the US system but with different numbering.
Frequently Asked Questions
What is a US ring size 7 in EU?
US ring size 7 equals EU size 54 (54 mm inner circumference, 17.35 mm inner diameter).
What is a US ring size 6 in UK?
US ring size 6 equals UK size L, EU size 51, and Japan size 12.
How do I convert EU shoe size to US?
EU 42 = US Men's 9 = US Women's 10.5 = UK 8.5. Use the shoe size converter above — select "Europe (EU)", enter 42, and see all equivalents instantly.
What is a men's size 10 shoe in EU?
Men's US size 10 equals EU 44, UK 9.5, and Japan 28 cm.
What is the average ring size for women?
The average women's ring size in the US is size 6–7 (EU 51–54, inner diameter 16.51–17.35 mm).
What is the average ring size for men?
The average men's ring size in the US is size 9–11 (EU 59–65, inner diameter 18.95–20.58 mm).
Is EU shoe size the same as UK shoe size?
No. EU 42 = UK 8. EU sizes are generally larger numbers than their UK equivalents. Use the converter above to find exact matches.
What does Japan shoe size 27 mean?
Japanese shoe sizes equal foot length in centimeters. Japan 27 = 27 cm foot length = EU 42 = US Men's 9 = UK 8.5.
How accurate is the printable ring sizer?
The SVG circles are sized at 96 DPI (standard CSS pixels). Accuracy depends on your printer's scale setting — always print at exactly 100% with no page scaling. Verify by measuring one circle with a ruler before using.