How to measure your ring size at home: 3 precise methods + chart

Method 1: Stiff paper and ruler (simplest)

This is the most accessible method because it only requires stiff paper, a ruler, and a pencil.

Procedure:

1. Take a strip of stiff paper (no more than 2-3 mm wide) and wrap it gently around the desired finger.

2. The paper must pass comfortably over the knuckle, the widest part of the finger: if it resists, the ring will be too tight; if it is too loose, it will fall off.

3. Mark with a pencil the exact point where the paper overlaps itself.

4. Lay the paper flat on a surface and measure the distance between the end and the mark with a ruler: this is the finger circumference in millimeters.

5. Subtract 40 from the circumference in millimeters: the result is your Italian size (52 mm = size 12). Alternatively, use the chart below.

Method 2: Digital caliper (most accurate)

If you have a digital caliper (a tool common in workshops and among hobbyists), this is the most reliable method.

Procedure:

1. Take a ring that fits you perfectly on that finger.

2. Place it horizontally and measure the inside diameter with the caliper, in millimeters.

3. Multiply the diameter by 3.14 (π). The result is the circumference.

4. Example: diameter 17.2 mm × 3.14 = 54 mm circumference; 54 − 40 = size 14.

Margin of error: < 0.5 mm. This is the method used by jewelers themselves.

Method 3: Reference ring and comparison

If you have a ring that fits perfectly, you can use it as a reference to order another one of the same size.

Procedure:

1. Place the reference ring on a sheet of white paper.

2. Trace the outline of the inner hole with a thin pencil.

3. Measure the diameter of the traced circle with a ruler (from one side to the other, passing through the center).

4. Multiply by 3.14 to obtain the circumference, then subtract 40 or consult the table.

This method is useful when ordering a ring as a gift and you want to maintain the same size as the new model.

Circumference → Italian size conversion table

In Italy, the ring size is obtained from the internal circumference in millimeters by subtracting 40. The international standard ISO 8653, used in France, Germany, and by many European brands, directly indicates the circumference instead: Italian size 12 corresponds to "52" ISO. For this reason, when buying from a foreign site, it is always better to think in millimeters.

Circumference (mm) = ISO size	Italian size	Circumference (mm) = ISO size	Italian size
48	8	55	15
49	9	56	16
50	10	58	18
51	11	60	20
52	12	62	22
53	13	64	24
54	14	66	26

Practical tips for a perfect measurement

Measure midday. In the morning, your finger is slightly more swollen from resting at night. In the evening, after hours of activity, the swelling decreases. Midday is when the measurement is most stable.

Measure at least 3 times. Even small variations in temperature or hydration change finger swelling. If you get different results, take the average.

Temperature matters. In winter, the finger is slightly thinner; in summer, with the heat, it swells a bit. If you are ordering a ring, take the season into account.

Found your size: what to order

With your size in hand, the choice becomes simple. The most common sizes for women — from 10 to 14 — are the ones most present in our 18k gold women's rings and 925 sterling silver women's rings; for men, the 20-26 range covers almost all 18k gold men's rings. For an engagement ring or wedding band, the size must be measured even more carefully: you can find wedding bands in the catalog and quick answers about sizes and modifications on the 18k gold women's rings: frequently asked questions page. If you are still deciding on the metal color, our guide on yellow, white, and rose gold helps you choose; for necklaces and bracelets, there is the complete size guide.

Do you have two sizes that are close and don't know which one to pick? Write to us via the contact page with the circumference you measured: we will tell you which size to order, and returns remain free within 30 days if the size isn't right.

FAQ — Frequently asked questions about ring sizes

Q: What is the difference between Italian and international sizes?
A: The Italian size is a number equal to the internal circumference in millimeters minus 40; the ISO standard uses the circumference directly, the American standard has its own numbers, and the British one uses letters. Always use the circumference in mm as a universal reference.

Q: What is the average size for a woman?
A: The most common size for a woman in Italy is between 10 and 14, which is an internal circumference of 50-54 mm.

Q: And for a man?
A: For a man, the most common size is between 20 and 26, which is an internal circumference of 60-66 mm.

Q: Can I wear the same ring on different fingers?
A: Rarely. Each finger has a different size. The index finger is usually half a size larger than the ring finger.

Q: How do I measure the size of a ring if it’s a surprise?
A: Secretly take a ring that the person usually wears on that finger and use method 3: outline on paper and diameter with a ruler. Alternatively, choose an average size (12-13 for her, 22-23 for him) and count on the free returns.

Q: Can a ring be resized?
A: In most cases, yes, by one or two sizes, if it is a wedding band or a plain gold or silver ring. Rings with stones all the way around the band, steel rings, and models with continuous engravings cannot be modified.

Q: How do I convert finger circumference to Italian size?
A: Just subtract 40 from the internal circumference in millimeters: 52 mm corresponds to size 12, 56 mm to size 16. If you have measured the diameter of a ring, multiply it by 3.14 first to get the circumference.

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Article written by Editorial Staff — Gioielleria Tosti, Cosenza, since 1972. Official distributor of certified Italian jewelry and watches.
Published 2026-09-12 | Updated 2026-10-04