Ring Size Chart & How to Measure Ring Size at Home

The average ring size in the US is 6 to 6.5 for women and 9 to 10 for men. And, if you’re planning to buy an engagement ring, wedding band or a gift, getting the right size is difficult.

We’re about to give you the answer to this question, “how to measure ring size at home?.” To determine your own size in about two minutes, wrap a piece of paper around the base of your finger, mark where it overlaps, and then measure that length in millimeters. The circumference of a US size 6 is 52 mm.

Check Out Ring Size chart: US, UK and EU

Ring sizes are based on the inside circumference of the band, the distance all the way around the inside. Diameter is the straight-line measurement across, which is what you'll use if you're measuring a ring rather than a finger.

Women’s Ring Size Chart

US / CA Ring Size	Diameter (mm)	Circumference (mm)
3	14.1	44.2
3½	14.5	45.5
4	14.9	46.7
4½	15.3	48
4¾	15.5	48.7
5¼	15.9	49.9
5¾	16.3	51.2
6¼	16.7	52.5
6¾	17.1	53.8
7¼	17.5	55
7¾	17.9	56.3
8¼	18.3	57.6
8¾	18.7	58.9
9¼	19.2	60.1
9¾	19.6	61.4
10¼	20	62.7
10¾	20.4	64
11¼	20.8	65.2
11¾	21.2	66.5
12¼	21.6	67.8
12½	21.8	68.5
13¼	22.4	70.3
13¾	23	71.6
14	23	72.3
14½	23.4	73.5

Men’s Ring Size Chart

US/Canada Ring Size	Diameter (mm)	Circumference (mm)
3	14.1	44.2
3.5	14.4	45.5
4	14.9	46.8
4.5	15.3	48.1
5	15.7	49.3
5.5	16.1	50.6
6	16.5	51.8
6.5	16.9	53.1
7	17.3	54.3
7.5	17.7	55.6
8	18.1	56.9
8.5	18.5	58.1
9	18.9	59.4
9.5	19.4	60.9
10	19.8	62.2
10.5	20.2	63.5
11	20.6	64.7
11.5	21	66
12	21.4	67.2
12.5	21.8	68.5
13	22.2	69.7
13.5	22.6	69.13
14	23	70.15
14.5	23.4	73.51
15	23.8	74.77
15.5	24.2	76.03
16	24.6	77.28

Sizes move in roughly 0.4mm of diameter per half size, which is small enough that careful measuring matters. For half sizes, larger sizes, and European, German and Japanese conversions, use our full ring size conversion chart.

How to measure ring size at home

Four methods. Pick based on what you have to hand.

Method 1: Measure a ring she already owns

You can count this as the most accurate at-home option. Plus, the one to use if you're planning a surprise for your loved ones.

Choose a ring that fits the correct finger comfortably.
Place it on a ruler.
Measure the inside diameter in millimeters.
Match it to the diameter column above.

Measure a ring worn on the same finger you're sizing for, every finger is different. Worth knowing too: most people's dominant hand runs about half a size larger. If you borrow from her right hand and she's right-handed, the left-hand size is likely a half size smaller.

Method 2: The string or paper method

Use string, dental floss, or a thin strip of paper. Anything stretchy should be avoided since it breaks down under pressure and reads too small.

Snug but not tight, wrap it around the base of the finger.
Verify that it still fits over the knuckle comfortably.
Mark where it overlaps.
Lay it flat and measure to the mark in millimeters.

That gives you the circumference. If the string measures 54mm, you're around a US 7.

Method 3: Printable ring sizer

Print at 100% scale and turn page scaling off, a sizer shrunk to fit the page will be wrong by a full size or more. Cut it out, then check it against something of known width before you trust it.

Method 4: Visit a jeweler

The most accurate option overall. It takes a few minutes and is typically done for free by a local jeweler with expert sizing equipment. If you're purchasing for yourself, it's worth the journey.

One more thing: if your knuckle is much larger than the base of your finger, measure both and pick something in between. The ring has to clear the knuckle without spinning once it's on.

How to find her ring size without asking

Method 1 is your best route if you can get hold of a ring, try while she's showering, swimming, or at the gym. If that's not an option:

Trace the inside. Sit the ring on paper, trace the inner circle, and measure across the tracing.
Press it into soap. Push the ring into a bar of soap and measure the impression.
Ask her sister or best friend. They often already know, and they're usually good at keeping it quiet.

Order a size 6 if none of it works. A fairly loose ring is easier to alter than one that won't fit at all, and it's the most common size for women.

What if the ring doesn't fit?

It gets resized, and that's a normal part of buying a ring rather than a disaster.

Within 90 days of delivery, we provide free resizing. The change is undetectable until a jeweler re-polishes the ring after adding or removing a little piece of metal at the bottom.

Therefore, if you have to select between two sizes for a proposal, go with the larger size. When it's appropriate for the crucial occasion, we'll make the required changes.

Know your size? Browse our engagement rings, or design your own, custom design is free, and so is resizing for the first 90 days.

FAQs - Ring Size Chart

1: Should I size up or down if I'm between sizes?

Size up. Taking metal out of a band is straightforward for a jeweler; stretching one that's too small is harder and can thin the metal.

2: Do wide bands need a different size?

Yes. A band 6mm or wider covers more of your finger and fits more snugly, so most people go up a quarter to a half size. It's a common reason a correctly measured ring still feels tight.

3: When's the best time of day to measure?

Late afternoon or evening, at normal room temperature. Fingers are puffier in the morning and after salty food, and they shrink noticeably in cold weather.

4: Can every ring be resized?

Most can. Full eternity bands are the exception, since stones run the whole way around and there's no plain metal to work with. Those need exchanging for the right size instead.