Ring Size Converter

Enter a ring size in any system — US, UK/AU, EU, or inner diameter/circumference in mm — and instantly see all equivalents. A full reference table is included below.

Input type

Value

Full Reference Table

Runs entirely in your browser. Nothing is uploaded.

How it works

STEP 1

Choose input type

Select whether you know the US size, UK/AU size, EU size, inner diameter, or inner circumference.

STEP 2

Enter your value

Type your ring size or measurement and click Convert to see all equivalents instantly.

STEP 3

Reference the table

Scroll down to the full conversion table to compare sizes across all systems at a glance.