Keep the original size beside the result

Translate a regional ring size without losing its source.

Convert the size you were given, then save the original system and value too. That small detail gives Leyloon a clearer fit record to review.

Use this converted size Save size in profile

Educational diagram—not physical scale or a personal-size promise. Regional and maker labels can differ; keep the original chart or maker with the physical measurements.

International size converter

Compare a ring size across the source-backed chart.

Conversion charts can differ. Choose the exact column printed on the size you already have, and keep the original chart or maker beside this starting comparison.

Starting systemStarting size

Country labels are not a fit guarantee. Confirm the maker’s chart, intended finger, and band width before choosing a final size.

Starting conversionChoose a starting sizeChoose the system and size you already know. Its physical row and closest listed comparisons will appear here.

Fit, wear & care—considered together

A clearer decision, with the important context kept beside it

Choose the system printed on your known size and see nearby Leyloon size table matches without losing the original label.

Use this page when

A ring, receipt, or jeweler record names a size system.
You are shopping across countries and want physical dimensions beside the labels.

Pause and choose another path when

The number has no system or maker attached.
You expect a sparse chart match to guarantee the fit of a different band.

Where this choice often matters

Ordering a ring from a country that uses another size label.
Sharing a known size with Leyloon while keeping its original system.

Compare the details

Every conversion needs an original and a physical anchor

A reliable conversion includes supported fractional sizes, names the standard it follows, and keeps the original system beside the physical dimensions.

Field	Example	Why keep it	If missing
Original system	US / UK / EU / JP	Prevents label confusion	Leave the converted size open
Original size	Exact whole or fraction	Preserves source	Ask for the record
Physical dimensions	Diameter and circumference	Shows nearby table rows	Treat match as approximate
Maker and band	Brand chart and width	Explains deviations	Confirm before ordering

Ring-size reference chart

Compare named sizes with inside measurements

Keep your original system and maker’s chart. This table is a comparison aid, not a universal fit promise.

Diameter inner edge to inner edge through the centerCircumference the complete inside path around the ringFit review intended finger, hand, band width, stack, and knuckle

US & Canada	UK, Europe & Australia	Asia	Inside diameter	Inside circumference
3	F	4	14.1 mm	44.3 mm
3.5	G	—	14.5 mm	45.6 mm
4	H	7	14.9 mm	46.8 mm
4.5	I	8	15.3 mm	48.1 mm
5	J	9	15.7 mm	49.3 mm
5.5	K	10	16.1 mm	50.6 mm
6	L	11	16.5 mm	51.8 mm
6.5	M	13	16.9 mm	53.1 mm
7	N	14	17.3 mm	54.3 mm
7.5	O	15	17.7 mm	55.6 mm
8	P	16	18.1 mm	56.9 mm
8.5	Q	17	18.5 mm	58.1 mm
9	R	18	19.0 mm	59.7 mm
9.5	S	19	19.4 mm	60.9 mm
10	T	20	19.8 mm	62.2 mm
10.5	U	22	20.2 mm	63.5 mm
11	V	23	20.6 mm	64.7 mm
11.5	W	24	21.0 mm	66.0 mm
12	X	25	21.4 mm	67.2 mm
12.5	Y	26	21.8 mm	68.5 mm
13	Z.5	27	22.2 mm	69.7 mm
13.5	Z1	—	22.6 mm	71.0 mm

Reviewed 2026-08-25. Source reference: GIA ring-size guide. This table follows GIA’s US and Canada, UK/Europe/Australia, and Asia columns; blank cells are not listed by GIA. Leyloon uses the nearest physical row without interpolation and keeps your original measurement beside it.

Keep your direction organised

The complete choice groups for this decision

Choose the system printed on your known size and see nearby Leyloon size table matches without losing the original label. The groups below keep related choices together, and every selection stays editable when you continue.

Which system is printed?

Choose one direction.

US / CanadaNumeric whole and fractional sizes.
UK / AustraliaLetter and fractional labels.
EUKeep the exact printed convention.
JapanNumeric system with original chart context.
Maker-specific or otherUse physical measurements where available.

What should the result include?

Keep every direction that fits.

Inside diameterMillimeters across the interior.
Inside circumferenceMillimeters around the interior.
Nearby rowsShows rounding honestly.
Original sourceMaker or document remains attached.

Questions worth asking

Open the concern that sounds like yours

Choose the question that sounds like yours. Each answer keeps the next step clear without closing decisions that still need review.

Why is my UK letter different on another chart?

Tables and rounding can differ. Keep the original label and compare the physical measurement rather than hiding the mismatch.

Is EU size just circumference?

Check which convention the chart uses, and keep the original system beside the result so similar numbers are not mistaken for the same size.

Can I use the converted result in Atelier?

Yes, with the original system, size, table match, and uncertainty kept together.

Ready when you are

Carry this direction into your design

Leyloon can keep these choices together while you continue. Every detail stays editable. Your choices stay editable as you continue.

Original system, size, and Leyloon size table matchesNeeded before the direction is complete
Band width and maker chartA useful next question
Physical measurement and any mismatchKeep it open if you are still deciding

Illustrative sizing workbench. Keep the original measurement and system visible when converting; a nominal size alone does not explain fit. Here it supports the decisions behind “Translate a regional ring size without losing its source.”

A visual map of this brief

See what stays known—and what remains open

This guide begins with “Convert the label, but never discard the original size system.” The next choices stay grouped, editable, and connected to that same Atelier brief.

Which original size system do you have?Keep the label exactly as supplied. This page may compare a reference row, but it does not replace the original maker's chart.
What should Leyloon keep with the label?These details stay private and help prevent a regional label from being treated as a universal fit.
Band width or stackChoose the planned contact width. Exact millimeters stay editable.
Ring you are sizingChoose the ring context so the measurement stays attached to the right width, profile, and finger.

Start with what matters on this page

Keep the original size system beside every comparison

Start with the label you were actually given. Keep its source, physical measurements, intended finger, and planned width visible while Leyloon reviews the fit.

01 Which original size system do you have?Choose one

Keep the label exactly as supplied. This page may compare a reference row, but it does not replace the original maker's chart.

02 What should Leyloon keep with the label?

These details stay private and help prevent a regional label from being treated as a universal fit.

03 Band width or stack

Choose the planned contact width. Exact millimeters stay editable.

04 Ring you are sizing

Choose the ring context so the measurement stays attached to the right width, profile, and finger.

What else should Atelier help with?

Add only the parts you want to explore. The page topic is already included.

Fit and formIncluded from this page

Choose which original size system do you have? to continue. “Not sure” is a valid choice.

Published customer proof

Real experiences, kept separate from promises

Only approved purchase-linked reviews appear here. An illustrative scene is never presented as a customer, and one person’s experience is never treated as a promise for another piece.

See what Leyloon customers have shared

Read recent shop reviews on Etsy, then come back when you are ready to shape your own fit and jewelry direction.

See Leyloon reviews on Etsy

These reviews reflect individual Leyloon service experiences. Your fit and jewelry direction and quote request are reviewed on their own.