Ring Size Converter
Convert ring sizes between US, UK, EU, and JP standards. Find your size from circumference or inner diameter.
Quick Answer
US size 7 = UK size N = EU 54 = JP 14 = 17.3mm diameter = 54.4mm circumference.
Convert From
Converted Sizes
7
US
N
UK
54
EU
14
JP
17.3mm
Diameter
54.4mm
Circumference
About the Ring Size Converter
Ring sizing varies around the world. The US uses a numerical system, the UK uses letters, the EU uses circumference in millimeters, and Japan uses its own numerical scale. When buying rings internationally or online, getting the right size is crucial since resizing can be expensive or impossible for certain materials and designs.
How to Measure Your Ring Size
The most accurate method is visiting a jeweler who has professional ring sizing tools. At home, you can wrap a thin strip of paper or string around your finger, mark where it overlaps, and measure the length in millimeters. This gives you the circumference, which you can enter directly into this converter. Alternatively, measure the inner diameter of a ring that fits well using a ruler or caliper.
Sizing Tips
Fingers change size throughout the day due to temperature and activity. Measure in the evening when fingers are at their largest. If you are between sizes, round up. Wide bands (over 6mm) require a slightly larger size because they sit tighter on the finger. Temperature matters too: cold fingers are smaller, warm fingers are larger.