Care · 4 minute read · Updated November 2026
How to find your ring size
Find your ring size at home with a printable sizer, then let us confirm it in the store. Your first sizing is free at Geraci Fine Jewelry.
Book a visit
A ring size is the inside diameter of the ring, in millimeters, written as a US number. US 7, a common women's size, is 17.3 mm across the inside. This guide explains how sizes work, how to measure at home, when to size up, and what we do at the bench. The printable sizer is on this page.
How ring sizes work
In the US a ring size is a number from about 3 to 13, in half sizes, and sometimes quarters. Each half size adds about 0.4 mm to the inside diameter, and each whole size about 0.8 mm. The size table and the printable circles further down use the US scale.
The inside circumference is what a strip of paper wrapped around the finger measures. US 7 is 54 mm around; US 10 is 62 mm.
Rings are sized to the finger they will live on, and the same person can be a different size on each hand. The dominant hand usually runs about a half size larger.
How to measure at home
- Use a ring that already fits that finger. Print the sizer at 100 percent and set the ring on the circles until one matches the inside edge. This is the most reliable home method.
- No ring to hand: cut out the strip from the printed sheet, wrap it around the base of the finger, mark where it overlaps and read the millimeters. Look that number up in the table under the strip.
- Measure at the end of the day, at room temperature. Fingers are smallest first thing in the morning and in the cold, and largest in the evening, in heat, and after salt or exercise.
- Measure twice. If the two readings differ by a half size, take the larger one for a wide band and the smaller for a thin one.
A measurement at home is a starting point. Before a ring is made or sized we confirm it at the counter with steel sizers, which takes a minute.
Print the sizer
The sheet below prints on one letter page. Print it at 100 percent, with no "fit to page" or scaling, and check the 50 mm bar against a ruler before you trust the circles.
How to use the sizer
- Print the sheet at 100 percent, with no "fit to page" or scaling. The bar at the top should measure 50 mm against a ruler.
- Lay a ring that already fits the finger over the circles. The circle whose inside edge matches the inside of the ring is the size.
- No ring to hand: cut out the strip, wrap it around the base of the finger where the ring will sit, mark where it overlaps and read the millimeters. The table under the strip turns that into a size.
| US size | Inside diameter | Inside circumference |
|---|---|---|
| 3 | 14.1 mm | 44.3 mm |
| 3 1/2 | 14.5 mm | 45.6 mm |
| 4 | 14.9 mm | 46.8 mm |
| 4 1/2 | 15.3 mm | 48.1 mm |
| 5 | 15.7 mm | 49.3 mm |
| 5 1/2 | 16.1 mm | 50.6 mm |
| 6 | 16.5 mm | 51.8 mm |
| 6 1/2 | 16.9 mm | 53.1 mm |
| 7 | 17.3 mm | 54.3 mm |
| 7 1/2 | 17.7 mm | 55.6 mm |
| 8 | 18.1 mm | 56.9 mm |
| 8 1/2 | 18.5 mm | 58.1 mm |
| 9 | 18.9 mm | 59.4 mm |
| 9 1/2 | 19.4 mm | 60.9 mm |
| 10 | 19.8 mm | 62.2 mm |
| 10 1/2 | 20.2 mm | 63.5 mm |
| 11 | 20.6 mm | 64.7 mm |
| 11 1/2 | 21.0 mm | 66.0 mm |
| 12 | 21.4 mm | 67.2 mm |
| 12 1/2 | 21.8 mm | 68.5 mm |
| 13 | 22.2 mm | 69.7 mm |
Geraci Fine Jewelry ring sizer
Print at 100 percent (actual size). US sizes, inside diameter in millimeters.
This bar measures 50 mm. If it does not, print at 100 percent (actual size).
- US 3
14.1 mm - US 3 1/2
14.5 mm - US 4
14.9 mm - US 4 1/2
15.3 mm - US 5
15.7 mm - US 5 1/2
16.1 mm - US 6
16.5 mm - US 6 1/2
16.9 mm - US 7
17.3 mm - US 7 1/2
17.7 mm - US 8
18.1 mm - US 8 1/2
18.5 mm - US 9
18.9 mm - US 9 1/2
19.4 mm - US 10
19.8 mm - US 10 1/2
20.2 mm - US 11
20.6 mm - US 11 1/2
21.0 mm - US 12
21.4 mm - US 12 1/2
21.8 mm - US 13
22.2 mm
Cut out the strip. Wrap it around the base of the finger, mark where the end overlaps, and read the millimeters.
44 mm = 3 · 46 mm = 3 1/2 · 47 mm = 4 · 48 mm = 4 1/2 · 49 mm = 5 · 51 mm = 5 1/2 · 52 mm = 6 · 53 mm = 6 1/2 · 54 mm = 7 · 56 mm = 7 1/2 · 57 mm = 8 · 58 mm = 8 1/2 · 59 mm = 9 · 61 mm = 9 1/2 · 62 mm = 10 · 63 mm = 10 1/2 · 65 mm = 11 · 66 mm = 11 1/2 · 67 mm = 12 · 68 mm = 12 1/2 · 70 mm = 13
Geraci Fine Jewelry, 9212 Colerain Avenue, Cincinnati, OH 45251. 513-385-4653. The first sizing on a ring bought here is free, and we size rings bought anywhere.
When to size up or down
Wide bands fit tighter. A band 6 mm or wider usually needs a half size up from a thin ring on the same finger, because more metal sits against the skin.
Knuckles decide. If the knuckle is much larger than the base of the finger, the ring has to pass the knuckle and will then be loose at the base. Pick the size that passes the knuckle with some effort; the ring will turn a little at rest, and sizing beads inside the shank can stop that.
Comfort-fit bands, rounded on the inside, slide on more easily and can run a quarter to a half size smaller than a flat band.
Stacked rings on one finger each take a little room. Three thin bands worn together fit like one wide band.
A ring should slide over the knuckle with a little resistance and sit at the base without spinning.
Which rings can be sized
Most gold and platinum rings can be sized up or down a size or two. The jeweler cuts the shank, adds or removes metal, solders the join and polishes it out, and on a ring with side stones checks every stone afterward.
Rings that cannot be sized: full eternity bands, rings with stones set all the way around, tension settings, and rings in tungsten, titanium or ceramic. Those are made or ordered in the right size instead. Rings with a wide pattern or engraving around the shank can be sized, but the pattern may interrupt at the join.
A ring that has been sized many times, or sized by more than two sizes, is weaker at the join; at that point a new shank is the better repair.
Sizing at Geraci
The first sizing on a ring bought at Geraci Fine Jewelry is free. We size rings bought anywhere, including online purchases and inherited rings. Bring the ring to the store at 9212 Colerain Avenue; no appointment is needed to drop it off, the estimate is free and often done while you wait, and most repairs are completed on-site within a week, depending on the repair. We call or text when it is ready.
If you are buying online from us and are not sure of the size, order the size you measured and we will size it once at no charge, or book a visit and we will measure you first. Rings returned within 30 days in their original condition carry our money-back guarantee; a ring that has been sized or altered does not, so measure first.
Buying a ring as a surprise
Borrow a ring from the box she wears on that finger and set it on the printed circles, or trace its inside on paper and measure the circle. Ask a friend or a parent who might know. Or buy the ring in the size that looks closest and let us size it afterward. The first sizing is free, and a plain or lightly set ring sizes cleanly.
Next step
Browse rings and engagement rings, each with its price, or book a free visit and we will measure the finger at the counter in a minute. Everything about repairs and sizing is on the repairs page.
Frequently asked questions
How do I measure my ring size at home?
Print the sizer on this page at 100 percent and lay a ring that fits over the circles, or wrap the paper strip around the base of the finger and read the millimeters. Then have the size confirmed at the counter before a ring is made or sized.
Is ring sizing free at Geraci?
The first sizing on a ring bought at Geraci Fine Jewelry is free. We also size rings bought anywhere, with a free estimate, often while you wait.
What is the average ring size?
Women's rings are most often between US 5 and 7, and men's between US 9 and 11. Hands vary more than that range suggests, so measure rather than guess.
Can every ring be sized?
Most gold and platinum rings can be sized up or down a size or two. Full eternity bands, rings with stones all the way round and some tension and tungsten rings cannot be sized, and are made or ordered in the right size instead.
Should a ring be loose or tight?
It should slide over the knuckle with a little resistance and sit at the base of the finger without spinning. If it goes on easily, it will come off easily.
From the case
