Whether you're buying a ring for yourself or planning a surprise, getting the size right matters more than any other detail. This ring size guide walks you through three reliable ways to measure your ring size at home, a full ring size chart with US, UK, and EU conversions, and the small details that throw a measurement off. In a few minutes, you'll know exactly what to order.
Why Proper Ring Sizing Matters
A ring that's too tight becomes uncomfortable within an hour and difficult to remove in cold weather, when fingers naturally shrink. A ring that's too loose spins on the finger, catches on fabric, and risks slipping off entirely, a real concern for rings worn daily or set with a center stone. Getting your ring size right the first time means a piece that disappears onto your hand instead of announcing itself. It also saves the time and shipping cost of a resize, and for engagement rings especially, it means the moment isn't followed by a trip to the jeweler.
Ring size also isn't fixed. Temperature, time of day, salt intake, and even altitude change finger size by a quarter size or more. The methods below account for that, and we'll flag exactly when to size up.
How Ring Sizes Are Measured
Ring sizes describe the internal circumference of the band. In the US and Canada, sizes run in whole and half numbers (6, 6.5, 7). The UK, Australia, and much of the Commonwealth use a letter scale (K, L, M). Most of Europe measures circumference directly in millimeters (52, 54, 56). Japan uses its own numeric scale. If you're shopping from outside the US or converting a size a family member gave you from another country, use the conversion chart below rather than guessing; a US 7 and a UK O are the same physical size, but a US 7 and an EU size labeled "7" are not.
Ring Size Chart: US, UK, and EU Conversions
Use the chart below to convert between sizing systems or to match a measurement in millimeters to your ring size. If your measurement falls between two sizes, size up: a slightly loose ring is more comfortable and safer than one that pinches.
US / Canada
UK / Australia
EU
Diameter (mm)
Circumference (mm)
4
H 1/2
46.5
14.8
46.5
4.5
I 1/2
48
15.3
48.0
5
J 1/2
49
15.7
49.3
5.5
K 1/2
50.5
16.1
50.6
6
L 1/2
51.5
16.5
51.9
6.5
M 1/2
53
16.9
53.1
7
N 1/2
54
17.3
54.4
7.5
O 1/2
55.5
17.7
55.7
8
P 1/2
56.5
18.1
57.0
8.5
Q 1/2
58
18.5
58.3
9
R 1/2
59
18.9
59.5
9.5
S 1/2
60.5
19.4
60.8
10
T 1/2
61.5
19.8
62.1
10.5
U 1/2
63
20.2
63.4
11
V 1/2
64
20.6
64.6
11.5
W 1/2
65.5
21.0
65.9
12
X 1/2
66.5
21.4
67.2
13
Z 1/2
69
22.2
69.7
Most women's rings fall between US size 5 and 7, with size 6 the most commonly ordered. Most men's rings fall between US size 8 and 11, with size 9 the most common. If you're sizing for someone else, these averages are a reasonable starting point, but the methods below will get you an exact number.
How to Measure Your Ring Size at Home
Three methods work well without any special tools. Try more than one and compare results; agreement between two methods is the best confirmation you have the right size.
Method 1: The String or Paper Strip
Cut a thin strip of string, dental floss, or paper about 6 inches long.
Wrap it snugly around the base of the finger you'll wear the ring on, just below the knuckle.
Mark the point where the string overlaps, or where the paper meets itself.
Lay the string flat and measure the length to that mark in millimeters.
Divide that number by 3.14 to get the diameter, or compare the circumference directly against the chart above.
1. WRAP
overlap mark
Wrap snugly below the knuckle
2. MEASURE
0
20mm
40mm
54mm read here
Lay the string flat and read the
circumference at the overlap mark
Method 2: An Existing Ring
Choose a ring that already fits the intended finger well, ideally one worn on that same finger.
Place it on a ruler or printed circle chart and measure the interior diameter in millimeters, edge to edge across the inside of the band.
Match that number to the diameter column in the chart above.
MEASURE AN EXISTING RING
interior diameter
0
10mm
20mm
17.3mm = size 7
Measure edge to edge across the
inside of a ring that already fits well,
then match to the chart above
This is the most reliable at-home method because it removes guesswork about tension and fit. If you're sizing secretly for a proposal, this is also the easiest way: borrow a ring the person already wears on the correct finger, measure it, and return it before they notice it's gone.
Method 3: A Printable Ring Size Chart
Download and print our ring size chart at 100% scale; do not use "fit to page," which will resize the circles.
Confirm the scale by measuring the printed reference line against a ruler.
Place an existing ring over each printed circle until you find the one it matches exactly on the inside edge.
Read the corresponding size directly off the page.
Download Printable Ring Size Chart
Tips for an Accurate Measurement
Measure at the end of the day. Fingers are smallest in the morning and in cold weather, and largest in the evening and heat.
Measure two or three times and use the most consistent result.
Account for your knuckle. If your knuckle is noticeably larger than the base of your finger, size for comfortable passage over the knuckle, not just a snug fit at the base.
Wider bands fit tighter than thin bands at the same labeled size. If you're choosing a wide band (6mm or more), consider sizing up half a size from your standard measurement.
Avoid measuring when your hands are cold, right after exercise, or after a salty meal, all of which temporarily change finger size.
Ring Size Frequently Asked Questions
What is the average ring size?The most commonly ordered women's ring size is 6, with most women falling between sizes 5 and 7. The most common men's size is 9, with most men falling between sizes 8 and 11. These are starting points, not substitutes for measuring.
What if I'm between two sizes?Size up. A slightly loose ring is comfortable and easy to resize smaller later; a ring that's too tight can be difficult to resize larger, especially with certain settings, and is uncomfortable to wear in the meantime.
Does ring width affect sizing?Yes. Wider bands, especially anything over 6mm, fit more snugly than a thin band at the same labeled size because more metal contacts the finger. Consider sizing up half a size for wide bands.
Can I size a ring secretly for a proposal?Yes. Borrow a ring the person already wears on their ring finger and measure its interior diameter, or ask a close friend or family member who knows their size. Avoid asking directly if you want to keep the surprise.
Can rings be resized after purchase?Most rings in gold, platinum, and silver can be resized up or down by a jeweler, typically within one to two sizes of the original. Eternity bands, rings with stones set all the way around, and some alternative metals cannot be resized. Check the product page or contact us before ordering if resizing may be needed later.
Get the Right Fit, Every Time
Once you know your size, browse our full ring collection with confidence, or reach out and our team will help you confirm sizing before you order.
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