Ring size chart

US sizes 3 to 15 in mm, cm and inches, with UK and EU sizes. Type what you know below.

Your size or measurement

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A US size 7 ring is 17.3 mm across the inside and 54.3 mm around. Size 10 is 19.8 mm across. Between two sizes? Order the next half size up.

US SIZE7

Ring size conversion chart: US sizes 3 to 15 with inside diameter and circumference in millimeters, centimeters and inches, plus UK, Australia, Ireland and European sizes.
US	Inside mm	Around mm	Inside cm	Around cm	Inside in	Around in	UK/AU/IE	EU
3	14.1	44.3	1.41	4.43	0.56	1.74	F	44
3.5	14.5	45.6	1.45	4.56	0.57	1.80	G	46
4	14.9	46.8	1.49	4.68	0.59	1.84	H	47
4.5	15.3	48.1	1.53	4.81	0.60	1.89	I	48
5	15.7	49.3	1.57	4.93	0.62	1.94	J½	49
5.5	16.1	50.6	1.61	5.06	0.63	1.99	K½	51
6	16.5	51.8	1.65	5.18	0.65	2.04	L½	52
6.5	16.9	53.1	1.69	5.31	0.67	2.09	M½	53
7	17.3	54.3	1.73	5.43	0.68	2.14	N½	54
7.5	17.7	55.6	1.77	5.56	0.70	2.19	O½	56
8	18.1	56.9	1.81	5.69	0.71	2.24	P½	57
8.5	18.5	58.1	1.85	5.81	0.73	2.29	Q½	58
9	19.0	59.7	1.90	5.97	0.75	2.35	R½	60
9.5	19.4	60.9	1.94	6.09	0.76	2.40	S½	61
10	19.8	62.2	1.98	6.22	0.78	2.45	T½	62
10.5	20.2	63.5	2.02	6.35	0.80	2.50	U½	64
11	20.6	64.7	2.06	6.47	0.81	2.55	V½	65
11.5	21.0	66.0	2.10	6.60	0.83	2.60	W½	66
12	21.4	67.2	2.14	6.72	0.84	2.65	X½	67
12.5	21.8	68.5	2.18	6.85	0.86	2.70	Z	69
13	22.2	69.7	2.22	6.97	0.87	2.74	Z+1	70
13.5	22.6	71.0	2.26	7.10	0.89	2.80	Z+2	71
14	23.2	72.8	2.32	7.28	0.91	2.87	Z+3	73
14.5	23.6	74.0	2.36	7.40	0.93	2.91	Z+4	74
15	24.0	75.4	2.40	7.54	0.94	2.97	Z+5	75

Canada uses US sizing. The UK, Australia and Ireland share the letter sizes. EU sizes are approximate conversions.

Order with confidence. Free size exchanges on unengraved rings, and engraved rings can add the Perfect Fit Promise. A ring sizer comes in every box. Shop rings

No number? Free sizer by mail, $5 off

Fit rules before you order

The chart gives you a number. These four rules turn it into a ring that fits.

Between two sizes? Take the next half size up.
Fingers swell through the day, and a ring that is a little loose is easier to live with than one that won't pass your knuckle.
Comfort-fit tungsten runs about a quarter size loose.
Order your measured size. Don't size up because a band is wide.
Size for the knuckle only if it's a full size wider.
Compare the base of your finger with the knuckle. Unless the knuckle is a full size or more wider, order the size that fits the base.
Measure warm, at the end of the day.
Cold fingers measure small. Measure the finger the ring will go on.

The most accurate way to find your size

Free ring sizer by mail

A reusable plastic sizer for sizes 1 to 17, half sizes included. It fits men and women, so one is enough for both of you, with a $5 coupon toward your ring in the envelope. No purchase needed.

Free
US only
3 to 7 days
One per order
$5 toward your ring

Sent by regular mail without tracking. Buying a ring already? A sizer comes in every ring order.

Other ways to find your size

Each one ends with a number you can type into the chart above. Prefer step-by-step photos? Read how to measure your ring size at home.

On-screen ring sizer

About 2 minutes · a bank card and a ring you own

Match your screen to a bank card first so the circle shows actual size. Then lay a ring that fits on the circle and adjust until its inside edge sits right on the line.

1. Match your screen

Not matched yet. On a phone this step is required.

2. Match a ring you own

Lay the ring on the circle. The ring's inside edge should sit right on the thin line, with no white gap and no line showing inside the ring.

717.3 mm across

Ring size

Match your screen to a card first (step 1), or this circle may not be actual size.

Men's and women's ring sizes

Ring sizes work the same for everyone, so men and women read the same chart. Sizing both of you? Fill in his and hers side by side.

HIS His size or measurement

Most men wear US 8 to 11, most often 10.

HER Her size or measurement

Most women wear US 5 to 8, most often 7.

On a couples set, his size goes in the navy box and hers in the purple box, just like here.

Shop couples rings

Sizing a surprise?

Borrow a ring they wear on that finger and measure its inside diameter, then type the millimeters above.
Lay their ring on the on-screen sizer while they're out.
Ask a friend or family member who can find out without giving it away.
Make it a casual in-store try-on together.

If the size is wrong

What happens depends on the ring. Every ring order also ships with a ring sizer, so you can check at home.

Free size exchange

US orders can be exchanged for a new size free within 21 days of the shipping date, while the ring is in its original, unworn condition. Start it in our returns portal. We email a prepaid label and ship the new size back free.

Read the full returns and exchanges policy

Ring size FAQ

Do you offer half sizes?

Yes. Every ring comes in whole and half sizes. If you are between two sizes, order the next half size up.

What if I order the wrong size?

Unengraved rings on US orders can be exchanged for a new size free within 21 days of the shipping date. We email a prepaid label and ship the new size back free. Engraved rings are final sale unless you add the Perfect Fit Promise when you order: $24 for a single ring or $34 for a couples set, one size exchange per ring, and you keep the original. Custom orders and orders shipped outside the US are final sale. Every ring order includes a ring sizer so you can check your size at home.

Do wide bands need a bigger size?

Not ours. Our comfort-fit tungsten bands run about a quarter size loose, so order your measured size and do not size up for width. Size up only if your knuckle is a full size wider than the base of your finger.

What is the average ring size for men and women?

Women average US 5 to 8, most commonly 7. Men average US 8 to 11, most commonly 10. A physical sizer is the most reliable way to be certain.

How can I find a ring size discreetly?

Borrow a ring they already wear and have it measured, compare it to one you own that fits them, or use a friend as a decoy to ask. A casual in-store try-on works too.

Do you make larger or inclusive sizes?

Yes. If the size you need is not listed for a ring you love, contact us and we will make it for you.

Is there a virtual ring sizer?

Yes. The on-screen ring sizer on this page shows actual size once you calibrate it with a bank card. Then lay a ring you already own on the circle to read your size.

How big is a size 7 ring?

A US size 7 ring has an inside diameter of 17.3 mm and an inside circumference of 54.3 mm, which is 5.43 cm or 2.14 inches.

Is there a printable ring sizer?

Yes. Download our printable ring sizer and print it at 100 percent, actual size. Check that the printed ruler measures exactly 80 mm before you trust it.

How can I measure my ring size for free?

Every method on this page is free. Use the on-screen sizer, print the sizer, measure a ring you already own, or order a free plastic ring sizer and we will mail it to you in the US.

Can I measure my ring size with my phone?

Yes, but calibrate first. Phone screens vary, so hold a bank card against the outline and drag the slider until it matches before you read a size.