Silver Ring Sizing Guide — How to Measure Your Finger Correctly in 2026

By Dmitry Strugovshchikov, founder of STRUGA

To measure your ring size at home, wrap a thin strip of paper or string around the base of your finger, mark where it overlaps, and measure the length in millimetres. That number is your inner circumference; divide it by 3.14 and you have the inner diameter — the number you actually pick on a STRUGA ring page. Measure in the evening, when fingers are at their largest, and measure three times.

Updated August 28, 2026

By Dmitry Strugovshchikov and Ekaterina Strugovshchikova, founders of STRUGA

Ring sizing means matching a finger's inner circumference in millimetres to an EU/US/UK chart; every STRUGA piece is 925 sterling silver.

EU size = inner circumference in mm directly (EU 54 = 54 mm); EU 54 ≈ US 7 ≈ UK N, and each US full size is about 2.5 mm.

Measure at home with a 6 mm × 100 mm paper strip around the finger base; multiply an existing ring's inner diameter by 3.14 for circumference (17.5 mm diameter = 55 mm = EU 55).

Measure in the evening, three times, and take the largest reading; cold fingers read up to a full size smaller.

Wide bands need +½ size for every 4 mm of width above 4 mm, so an 8 mm band on an EU 54 finger is ordered EU 54½ or 55.

STRUGA rings are picked by inner diameter in millimetres, not by an EU number — the range runs 15–22 mm: divide your circumference by 3.14 and round to a whole millimetre. Textured and blackened pieces cannot be cleanly resized.

Why ring sizing matters more for silver than you think

A wrong-sized ring is not a small problem. Half a size too small and the ring stops at the knuckle or cuts off circulation. Half a size too big and it spins, slides, and eventually leaves the hand on a beach or in a sink.

Silver compounds the issue. Sterling silver — the 925 alloy STRUGA uses across every piece — is softer than steel and harder than fine silver. It can be resized, but only within limits. A heavy brutalist band with deep texture cannot be opened up two sizes without losing the surface character. So measuring correctly the first time is not vanity, it is economics.

This guide covers the three home methods, the EU/US/UK conversion, the knuckle problem, the wide-band correction, and the specific things that change when you are buying a heavy oxidised silver ring rather than a thin wedding band. If you want the short version, jump to the Ring Size Guidance page.

What is a ring size, actually?

A ring size is a number that describes the inner circumference of the ring — the length of the inside circle, in millimetres. Everything else (US numbers, UK letters, Japanese numbers) is a code on top of that base measurement.

The European system is the most honest: EU size 54 means the inner circumference is 54 mm. EU 60 is 60 mm. There is no math, no chart needed once you know the millimetre number — you simply order the size that matches your finger.

The US system uses a separate numeric scale that does not map directly to millimetres. Each full size is about 2.5 mm of circumference, and half sizes exist between every full size.

The UK system runs on letters: A is the smallest, Z+ the largest. UK N is roughly EU 54, and UK Q is roughly EU 58. The British system also uses half-letters (N½, P½), which makes it the most granular of the three.

Which STRUGA ring size do I order, and how does my measurement convert?

The size option on every STRUGA ring page is called Inner diameter (mm) — the inner diameter in whole millimetres, running 15 to 22. Neither EU nor US appears in that dropdown, so the measurement is converted once: divide the circumference by 3.14 and round to a whole millimetre.

Inner diameter (mm) — what you pick	EU (circumference, mm)	US size
15	47	4
16	50	5¼
17	53	6½
18	57	8
19	60	9
20	63	10¼
21	66	11½
22	69	12½

One whole millimetre of diameter is about 3.1 mm of circumference — coarser than a full US size. There are no half steps in our range, so every row is the nearest match rather than an exact equality. Three rings start at 15 mm — Triple Drills, Brutalism V.1 and V.3; the rest of the range runs 16 to 22 mm.

The full EU / US / UK conversion beyond this range, with British letters and one-millimetre steps, is kept separately — in the European to US ring size conversion chart.

How do I measure my ring size at home?

Three methods, and none of them need special tools. The string method is the fastest, the paper method is the most accurate, and the existing-ring method is the most reliable if you already own a ring that fits.

Method 1 — Paper strip (most accurate)

Cut a strip of paper about 6 mm wide and 100 mm long. Wrap it around the base of the finger you want to size, snug but not tight. The strip should slide over the knuckle without forcing it.

Mark the overlap point with a pen, and lay the strip flat against a ruler with millimetre markings. Read the length from the start to the mark. That number is your inner circumference, which is your EU size directly.

Do this three times across the day, and pick the largest result. Fingers swell as the day goes on, after meals, in heat, after exercise. The largest reading is the size that will not feel tight at 6 pm in summer.

Method 2 — String

Same procedure, but with a piece of non-stretchy thread or thin cord. Avoid yarn — it stretches and gives you a false large reading. Sewing thread, dental floss, or thin twine works.

The string method has one weakness: it is harder to mark the overlap accurately because the cord shifts. If you can do paper, do paper.

Method 3 — Existing ring

If you already own a ring that fits the target finger comfortably, measure its inner diameter — the distance across the inside, edge to edge. Use a ruler with millimetre markings.

Multiply the inner diameter by 3.14 to get the circumference: a 17.5 mm inner diameter has 55 mm circumference (EU 55, US 7¼). You do not have to move that diameter onto another scale at all — round it to a whole millimetre and that is the size you pick on the product page.

This method works only if the existing ring fits the same finger and is similar in width to the one you are buying. A thin 2 mm band on your middle finger is not a reliable reference for an 8 mm brutalist band on the same finger.

When do I measure — and which finger?

Measure in the evening, after you have been moving and eating, ideally in a warm room. Cold morning fingers can read half to a full size smaller than their afternoon size. Hot summer-evening fingers can read half a size larger than winter morning, and aim for the middle of that range.

Measure the finger you actually plan to wear the ring on. The dominant hand runs slightly larger than the non-dominant — usually a quarter to a half size. The ring finger is not always smaller than the middle finger, and the middle finger is, on most people, the largest. Measure each finger you might use.

If you are buying a gift and cannot measure the recipient directly, borrow one of their rings, trace the inside circle on paper, and bring the paper to a local jeweller. Or pick a piece from our silver rings in the size you guess and use the resize policy as a safety net.

The knuckle problem

Some people have knuckles much wider than the base of the finger. The ring needs to pass over the knuckle but stay put at the base. If you size to the base, the ring will not go on, and if you size to the knuckle, it will spin and slide.

The rule: size to the knuckle, then choose a wider band. A wide band (6 mm or more) at knuckle size sits more stably at the base than a thin band, because there is more surface contact and more friction. This is one of the reasons brutalist wide rings — the kind we build in the Brutalism collection — work well for people with high knuckles.

If you absolutely need a thin band over a wide knuckle, the standard solution is sizing beads — small balls soldered to the inside of the band that grip the base of the finger. They can be added by any silversmith, and we can build them into custom pieces by request.

Why wide rings need a different size

A 2 mm thread of silver and an 8 mm slab of silver at the same nominal size do not feel the same on the finger. The wider the band, the more skin contact, the tighter it reads.

The standard correction is half a size up for every 4 mm of width above 4 mm. In our range that means one thing: round the diameter up, not down. A strip reading 54 mm of circumference is 17.2 mm of diameter, so for an 8 mm STRUGA men's silver ring order 18 mm, not 17. For a 12 mm wide statement ring, add a whole millimetre of diameter to the measurement.

This is not vanity sizing — it is geometry. The wider the ring, the more of its surface presses against the finger, and the less tolerance the finger has for tightness across that surface.

The same applies to comfort-fit bands (rings with a domed inner surface). Comfort-fit reads slightly looser at the same nominal size, so you may want to order half a size down. Most STRUGA rings are flat-inside, not comfort-fit, because the inner surface is also part of the brutalist character.

What is the largest ring size, and how far does STRUGA go?

The largest standard size in the US system is 16, about 77 mm of circumference, and the UK scale ends at Z with plus signs. Beyond that, every ring is made to order.

Most jewellery brands run up to US 13 — about 70 mm of circumference — and some men's-focused brands up to US 15. The STRUGA range is 15 to 22 mm of inner diameter, roughly 47 to 69 mm of circumference: from a fine woman's hand to a large man's. Anything outside the range we make as a Custom Order against your millimetre measurement, priced to the brief rather than off a list. The same applies to a paired or wedding piece: those have their own route, Dark Union.

If you are at the smallest end of the range (15 mm of diameter, about EU 47), most brutalist designs will look out of proportion — a heavy 10 mm band on such a finger covers half the joint. We would steer you towards thinner pieces from the dark minimalist rings collection, where a 4 mm band reads correctly.

Lip ring sizes — a separate system

Lip rings are not finger rings, and the search term is a common confusion. They are body jewellery, sized in two dimensions: gauge (the thickness of the bar) and inner diameter (the size of the loop or length of the labret post).

Standard gauges run from 16g (1.2 mm) to 14g (1.6 mm), and standard inner diameters for hoops run 6 mm to 10 mm. Standard labret post lengths run 6 mm to 12 mm.

STRUGA does not currently make lip jewellery — our piercing range covers ear pieces only. If you are looking for ear jewellery in the brutalist register, see the oxidised silver collection for cuffs and studs sized for the lobe and upper ear.

What if my size is between two sizes?

Round up, not down. A ring that runs slightly large can be padded with a silicone sizer (a clear sleeve that grips the inside) or resized down by a silversmith. A ring that runs slightly small cannot easily be made larger without distorting the texture or thinning the band.

STRUGA rings have no half steps: the choice is in whole millimetres of diameter. A 55 mm circumference is 17.5 mm, exactly between two rows of the range — take 18. For wide rings rounding up is required anyway, so the correction points the same way.

How accurate is a paper-strip measurement?

The paper-strip method is accurate to within ±0.5 mm if you do it three times and pick the largest, and within ±1 mm if you do it once. The professional ring sizer (the metal stick with marked rings) is more accurate, but only by a fraction. For 95% of buyers the paper method is enough.

The remaining 5% are people buying expensive pieces, people with unusual finger shapes (particularly flat, particularly oval), and people with high knuckles. Those buyers should visit a local jeweller for a steel mandrel measurement. Most jewellers will size your finger for free, even if you are not buying from them.

Can a STRUGA ring be resized?

Some can, some cannot. Understated bands without surface texture can be resized by ±1 size without visible damage. Brutalist textured rings and blackened pieces cannot be cleanly resized — the texture distorts and the oxidation breaks at the cut.

For pieces from Brutalism, CODEX, and most of the signet ring range, the right approach is to get the size right at order, not to plan on resizing later. We offer one exchange within 14 calendar days of delivery if the size is wrong: the ring unworn beyond trying it on, in its original packaging, and with a Return Authorization agreed before you send it — return and replacement shipping are paid by you. A ring built to your millimetre measurement through Custom Order is final.

Does silver shrink or stretch over time?

Silver does not shrink. It can stretch slightly under sustained pressure — a thin band worn for years on a finger that has gained weight will deform, not because the silver shrinks but because the finger forces it open. This is a millimetre-level change at most.

What changes is your finger. Fingers gain and lose girth with weight, age, pregnancy, hormonal cycles, and seasons. A ring that fits at 25 may not fit at 45, and this is normal and not a defect of the ring. Plan for the size your finger is currently, not the size you hope it will be.

Continue from the journal to a current STRUGA object: Signature Links V.2 Ring.