Home/Ring Size Guide

Find Your Perfect Fit

Ring Size Guide

Our rings come in standard US sizes with quarter-size precision. Use the chart and methods below to find the size that feels just right — because a perfect ring deserves a perfect fit.

Two Simple Methods

How to Measure Your Ring Size

Measure an Existing Ring

Find a ring that fits the intended finger well

Place it on a flat surface

Measure the inside diameter in millimeters

Match the diameter to our size chart below

Measure Your Finger

Wrap a flexible tape or strip of paper around the base of your finger

Ensure it fits snugly but not too tight

Mark where the end meets and measure the length in mm

Use the circumference column in our chart to find your size

International Conversions

Ring Size Chart

Measure the inside diameter of a properly fitting ring and use the chart below to find the corresponding US ring size.

US Size	UK Size	EU Size	Diameter (mm)	Circumference (mm)
3	F	44	14.0	44.0
3.25	F½	44.5	14.1	44.4
3.5	G	45	14.3	44.8
3.75	G½	45.5	14.4	45.2
4	H	46	14.5	45.5
4.25	H½	46.8	14.7	46.1
4.5	I	47	14.8	46.5
4.75	I½	47.8	15.0	47.0
5	J	48	15.1	47.4
5.25	J½	48.5	15.3	47.8
5.5	K	49	15.4	48.3
5.75	K½	49.5	15.5	48.7
6	L	50	15.7	49.3
6.25	L½	50.5	15.8	49.7
6.5	M	51	16.0	50.1
6.75	M½	51.5	16.1	50.5
7	N	52	16.3	51.0
7.25	N½	52.5	16.4	51.5
7.5	O	53	16.5	51.9
7.75	O½	53.5	16.7	52.4
8	P	54	16.8	52.8
8.25	P½	54.5	17.0	53.2
8.5	Q	55	17.1	53.6
8.75	Q½	55.5	17.2	54.1
9	R	56	17.4	54.5
9.5	S	57	17.7	55.5
10	T	58	17.9	56.3
10.5	U	59	18.2	57.2
11	V	60	18.5	58.1

Expert Advice

Sizing Tips

Measure at the Right Time

Your fingers change size throughout the day. Measure in the afternoon or evening at room temperature for the most accurate result — avoid early mornings, cold weather, or after exercise.

Consider the Band Width

Wider bands feel tighter than narrow ones. If you're choosing a band wider than 6mm, consider going up a quarter size for a comfortable everyday fit.

When in Doubt, Go Larger

A ring that's slightly too large can always be resized down. A ring that's too tight is uncomfortable and harder to remove over the knuckle.

Account for Knuckles

If your knuckle is significantly larger than the base of your finger, measure both and choose a size between the two — snug enough to stay on but easy enough to slide over.

Common Questions

Frequently Asked Questions

If you find yourself between ring sizes, we recommend opting for the larger size. Finger size naturally varies throughout the day, and a slightly larger ring is more comfortable than one that's too tight. We offer quarter sizes to ensure the most precise fit possible.

Yes. We offer complimentary first-time resizing on all Mercury & Sol rings. Simply contact our specialists within 90 days of receiving your piece, and we'll handle the rest. Please note that certain styles — such as eternity bands and open rings — cannot be resized due to their design, but can be exchanged for the correct size within 30 days.

No need to worry. Contact us within 90 days of delivery, and we'll resize your ring at no additional cost. For styles that cannot be resized, we offer a complimentary exchange for the correct size within our 30-day exchange window.

The most accurate method is to visit a local jeweler for a professional measurement. If that's not possible, use a flexible measuring tape wrapped snugly (not tight) around the base of your finger. Measure in millimeters and compare to our chart above. For the best results, measure at room temperature — fingers swell in heat and shrink in cold.

Yes. We'll mail you a complimentary reusable ring sizer so you can find the perfect fit at home. Simply request one through our Contact a Specialist link on any product page, and we'll have it sent to you.

Still Unsure?