Best for matching an existing ring measurement to international size labels.

Ring Size Chart

Compare common ring sizes by inside diameter, inside circumference, and regional labels. The chart is built for quick shopping checks and for sellers who need a dependable reference table.

Measure and get a size suggestion

Use your own measurements to find the closest reference row, then confirm with the brand chart.

Ring inside diameter and finger circumference illustration

How to measure

Rings

Measure the inside diameter of a ring that fits.
Or wrap a paper strip around the finger and measure the overlap.
Repeat when hands are at normal temperature.

Your measurements

Measurement type

Measurement (mm)

Closest reference

Enter the measurements you have. A partial result is okay, but more fields give a better match.

Reference only. Product cut, ease, width, material, and brand rules can change the final size.

Measurement details

Ring size is best checked by millimeters. Use either a ring that fits or the finger circumference.

Existing ring diameter

Choose a ring that fits the intended finger and measure the inside diameter edge to edge.

Do not measure the outside edge; that includes the metal thickness.

Finger circumference

Wrap a strip of paper or soft tape around the finger, mark the meeting point, and measure the length flat.

The strip should pass over the knuckle without feeling loose.

Timing

Measure when hands are at a normal temperature. Cold fingers can read small; warm or swollen fingers can read large.

Repeat a few times and compare the average.

Wide bands

Wide rings and ring stacks feel tighter than narrow bands.

If you are between sizes, the larger size is usually safer.

US	UK	ISO/EU	JP	CN	Diameter	Circumference
3	F	44	4	4	14.1 mm	44.2 mm
3.5	G	46	6	6	14.5 mm	45.5 mm
4	H	47	7	7	14.9 mm	46.8 mm
4.5	I	48	8	8	15.3 mm	48 mm
5	J 1/2	49	9	9	15.7 mm	49.3 mm
5.5	K 1/2	51	10	10	16.1 mm	50.6 mm
6	L 1/2	52	11	11	16.5 mm	51.9 mm
6.5	M 1/2	53	13	13	16.9 mm	53.1 mm
7	N 1/2	54	14	14	17.3 mm	54.4 mm
7.5	O 1/2	56	15	15	17.7 mm	55.7 mm
8	P 1/2	57	16	16	18.1 mm	57 mm
8.5	Q 1/2	58	17	17	18.5 mm	58.3 mm
9	R 1/2	60	18	18	18.9 mm	59.5 mm
9.5	S 1/2	61	19	19	19.4 mm	60.8 mm
10	T 1/2	62	20	20	19.8 mm	62.1 mm
10.5	U 1/2	63	22	22	20.2 mm	63.4 mm
11	V 1/2	65	23	23	20.6 mm	64.6 mm
11.5	W 1/2	66	24	24	21 mm	65.9 mm
12	Y	67	25	25	21.4 mm	67.2 mm
12.5	Z	68	26	26	21.8 mm	68.5 mm
13	Z+1	70	27	27	22.2 mm	69.7 mm
13.5	Z+2	71	29	29	22.6 mm	71 mm
14	Z+3	72	30	30	23 mm	72.3 mm
14.5	Z+4	73	31	31	23.4 mm	73.6 mm
15	Z+5	75	32	32	23.8 mm	74.8 mm
15.5	Z+6	76	34	34	24.2 mm	76.1 mm
16	Z+7	77	35	35	24.6 mm	77.4 mm

How to Use This Ring Size Chart

Measure the inside diameter of a ring that already fits, or measure the inside circumference with a paper strip. Find the nearest millimeter value in the chart and compare the regional sizes on the same row. If your value lands between two rows, choose based on ring width and fit preference: wider bands usually feel tighter, while slim bands may allow a slightly smaller size.

US, UK, EU, JP, and CN Ring Conversion

Ring systems do not label sizes in the same way. US sizes use numbers with half steps, UK sizes use letters, EU labels often follow circumference in millimeters, and JP/CN labels commonly map to local numeric systems. This chart keeps those labels together so you can compare a marketplace listing, a jeweler recommendation, and an international product page without switching tools.

Common Ring Fit Mistakes

Finger size changes with temperature, time of day, salt intake, and activity. Measuring once when hands are cold can lead to a tight purchase, while measuring after exercise may produce a size that is too loose. For the most reliable result, measure several times, avoid pulling paper strips too tightly, and consider the knuckle if the ring must pass over a wider joint.

When to Confirm With a Jeweler

Use online charts for planning and shopping, but confirm with a jeweler for expensive rings, wide bands, engagement rings, or final resizing decisions. Professional mandrels and ring gauges are more consistent than home measurements. If you are buying as a gift, compare multiple clues such as an existing ring, regional size label, and the recipient's preferred finger.

Ring Size Chart Standards and Rounding

Ring charts look precise, but most public tables are rounded references. A US half size may sit between two circumference values, while EU labels often follow inner circumference in millimeters and then round to a whole number. UK letters also use intermediate labels such as half letters in many retail charts. When a seller gives both a size label and a millimeter value, use the millimeter value as the anchor and treat the regional label as a shopping translation.

How This Ring Chart Beats a Simple PDF

Many ring guides are static PDFs with one country system and no context. This page keeps diameter, circumference, and regional labels together, then adds measurement guidance and a calculator path for shoppers who only have one raw value. That helps buyers compare a jeweler page, a marketplace listing, and an existing ring without guessing whether the chart is using inside diameter, outside diameter, or finger circumference.

Related Size Tools

Continue with closely related tools instead of jumping through an unrelated directory.

Ring Size Calculator

Best for turning a raw millimeter measurement into a practical ring size.

Ring Size Converter

Best for comparing international jewelry listings that use different regional labels.

Printable Ring Size Chart

Best for at-home measuring when a physical ring gauge is not available.

Size Chart Generator

Best for merchants who need a product-page size chart quickly.

FAQ

What is the easiest way to find my ring size?

Measure the inside diameter of a ring that fits well, then match it to the nearest row in the chart.

Are US and UK ring sizes the same?

No. US sizes use numbers, while UK sizes use letters. Use the same row in the chart to compare them.

Should I size up for a wide ring band?

Often yes. Wider bands can feel tighter, so many buyers choose a slightly larger size after confirming with the seller.

Is this ring size chart exact for every brand?

Use the result as a sizing reference, then check the brand or seller chart before buying. Materials, fit preference, country labels, and manufacturing tolerances can change the best choice.