Ring Size & Dress Size Converter
Turn one measurement into US, UK, EU and JP ring sizes, and convert dress sizes across US, UK, EU, IT and JP. Free, instant, with the caveat that sizing is always approximate.
Ring size
Dress size
What this tool does
- Free, no signup, one-click copy — everything runs in your browser; nothing is uploaded.
- 40+ ideas in one run — from two first names, a shared surname and the wedding year.
- Grouped into four sets — name mashups, puns & wordplay, classics, and date-based options.
- Copy all / Download — grab one tag, or export the whole list as a text file for your planner or printer.
- “IG” check link — every tag links straight to Instagram's tag page so you can see with one click whether it is already in use.
- 500 surname pages — ready-made ideas for the most common surnames.
Frequently asked questions
How do I measure my ring size at home?
Measure the inner diameter of a ring that fits — straight across the inside, in millimetres — or wrap a strip of paper around your finger and measure the length (that is the circumference).
Why does my size differ between shops?
Because sizing standards are not universal: US numbers, UK letters, EU/ISO millimetres and Japanese numbers all use their own scales, and bridal sizing often runs small.
Which number matters for ordering?
The millimetre measurement. Give the jeweller your inner diameter or circumference in mm and let them apply their own chart.
Is this converter exact?
No. It is a reference tool built on standard formulas and charts — confirm the final size with the maker before ordering, especially for a ring you will wear daily.
What is the most reliable measurement?
Inner diameter in millimetres, taken from a ring that already fits. Circumference is the same number multiplied by pi, so it carries the same error.
Do men’s bands use the same scale?
Widths differ but the inner measurement does not; give the jeweller the diameter and let them apply their own chart.