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

By Dmitry Strugovshchikov, founder of STRUGA

Wrap a thin strip of paper around the base of your finger, mark where the end meets the start and read the length in millimetres: that is your inner circumference, and in the European system it is your size (54 mm is EU 54). Divide it by 3.14 for the inner diameter — the number you pick on a STRUGA ring page. A 56 mm strip is 17.8 mm across, so order 18. Measure in the evening, in a warm room, three times.

Updated September 28, 2026

EU sizes are the inner circumference in millimetres (EU 54 = 54 mm); US sizes are a separate scale where one full size is about 2.5 mm of circumference, and EU 54 is roughly US 7.

STRUGA rings are chosen by inner diameter in whole millimetres, 15 to 22 mm: circumference ÷ 3.14, rounded up when it falls between two rows.

Silver is priced by weight, so a bigger size weighs and costs more: the Brutalism V.1 Ring is about 9.6 g at 15 mm and about 24 g at 22 mm, $382 to $1,013. Every ring is made to order in Bali in 2–4 weeks, often sooner.

One resize is free, with shipping both ways on the owner; Brutalism V.1 and V.3 cannot be resized once made.

925 silver is softer than steel, and a jeweller can adjust a thin band almost every time. A heavy textured ring is a different case: relief across the top does not survive stretching, and an extra millimetre of diameter on a wide shank is several more grams of metal. That is why the measurement matters more for a silver ring than for a thin wedding band. This guide covers taking it at home, converting it to our range, and what changes when the ring is wide and heavy.

How do I measure my ring size at home?

You need a paper strip about 6 mm wide, a pen and a ruler with millimetre marks. Wrap the strip around the base of the finger — snug, but loose enough to slide over the knuckle. Mark where the end overlaps the start, lay the strip flat and measure to the mark. That length is the inner circumference; in the European system it is your size directly, and divided by 3.14 it becomes the diameter you pick on our ring pages.

String works the same way, but only if it does not stretch — sewing thread or dental floss. Yarn stretches and reads large, and cord shifts while you mark it. If you already own a ring that fits the same finger, measure its inside edge to edge: that is the diameter, with no conversion needed.

An existing ring is a fair reference only if it is close in width to the one you are buying — a 2 mm band says little about a wide shank. Paper and string both drift by half a millimetre to a millimetre, which is why you measure three times and keep the largest reading. When in doubt, a jeweller can size the finger with a set of gauge rings.

The four home methods and the mistakes that throw them off are covered in full in how to measure your ring size at home.

Is a ring size the diameter or the circumference?

It depends on the system. Under ISO 8653, the European size is the inner circumference in millimetres: EU 54 means 54 mm around the inside of the band. Some countries, Russia among them, use the inner diameter instead. Both describe the same ring, linked by π: circumference = diameter × 3.14.

The US scale is a separate run of numbers. One full US size adds about 0.8 mm of diameter, or roughly 2.5 mm of circumference; US 7 is about 17.3 mm across and 54.4 mm around. The UK scale runs on letters, each about 1.25 mm of circumference apart: UK N is roughly 53–54 mm, UK Q roughly 57–58 mm.

EU (circumference, mm)	Inner diameter, mm	US (nearest)
50	16	5¼–5½
53	17	6½
57	18	7¾
60	19	9
63	20	10¼

Each row is the nearest match, not an equality: the scales cut sizes into different steps. The full conversion with every letter and number is in the European to US ring size conversion chart.

Which STRUGA ring size do I order?

The size option on every STRUGA ring page is called Inner diameter (mm) — the inside diameter in whole millimetres. 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.

Every ring comes in 16 to 22 mm, and three start at 15 mm: Triple Drills, Brutalism V.1 and V.3. In circumference that is roughly 47 to 69 mm — from a slender hand to a large one. There are no half sizes in the range, so a 17.5 mm diameter is ordered as 18.

Inner diameter on the page, mm	Circumference / EU, mm	US (nearest)
15	47	4¼
16	50	5¼–5½
17	53	6½
18	57	7¾
19	60	9
20	63	10¼
21	66	11½
22	69	12¾

One whole millimetre of diameter is about 3.1 mm of circumference — coarser than one US size. So a reading between two rows is rounded up: a ring that is slightly loose can be worn, a tight one cannot. The full range is on the silver rings page.

When should I measure, and which finger?

In the evening, after moving and eating, in a warm room. Fingers shrink in the cold and in the morning and swell in heat and later in the day, and the swing can reach a quarter to half a size. A ring sized to a cold morning finger will pinch on a summer evening; one sized in the heat will spin in winter. Aim for the middle of that range — three readings at different times beat one.

Measure the finger and the hand you will actually wear it on. The dominant hand usually runs a little larger, and the middle finger is the thickest on most people, so a ring-finger size does not transfer to it. If the ring may move between fingers, measure both.

For a gift, borrow a ring the person already wears on the right finger and measure its inside diameter with a ruler. Quieter ways of finding a size are collected in the ring size guidance. A miss by one size is covered by the free resize — except on the two rings described below.

What if my knuckle is wider than the base of my finger?

Size to the knuckle, not the base. The ring has to pass the joint first; sized to the base, it will not go on. The trade-off is that at the base such a ring sits looser and can turn.

A wide shank takes some of that away: it has more contact with the skin and stays in place better than a thin band of the same size. That is why heavy wide rings, like those in the BRUTALISM family, often suit people with large knuckles better than thin ones.

If you want a thin band over a wide knuckle, a jeweller can solder two small sizing beads inside the shank: they hold the ring at the base while letting it pass over the joint. On a finished ring this is a jeweller's job after purchase; on a ring made from scratch to your measurement, it belongs in the Custom Order brief.

Do wide rings need a bigger size?

Yes — usually a quarter to half a size. A 2 mm band and an 8 mm shank at the same nominal size do not fit alike: the wider the ring, the more skin it covers, the tighter it feels and the harder it passes the joint. Blue Nile advises considering half a size up for wider styles; Brilliant Earth puts the line at bands over 4 mm, while other retailers start at 6 mm.

In our range that rule becomes one action: round the diameter up. A strip reading 54 mm of circumference is 17.2 mm across; for a thin ring 17 works, for a wide one order 18.

Comfort-fit rings, with a domed inner surface, go the other way: they feel looser at the same size, and are often ordered half a size smaller — though not when the band is wider than 8 mm. Before ordering, look at the inside of the shank in the photos: flat or domed.

What if my measurement falls between two sizes?

Round up. A ring that runs slightly large can be made smaller or fitted with a clear silicone sizer inside. A ring that runs small cannot be enlarged without stretching, and stretching thins the shank and distorts the texture.

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 — take 18. For a wide ring rounding up is needed anyway, so the two corrections point the same way and do not add up: 17.5 mm for a wide shank is still 18, not 19.

Why does a bigger silver ring weigh and cost more?

A larger diameter is a longer shank, which means more silver, and the price of our rings follows the weight. On a thin ring the difference across the range is a couple of grams; on a heavy one it more than doubles. Here are the weights and prices of the catalogue rings at both ends of their range; weight is the catalogue figure, and every handmade piece varies a little.

Ring	Sizes, mm	Weight: smallest → largest size	Price
Brutalism V.1	15–22	9.6 → 24 g	$382 – $1,013
Brutalism V.3	15–22	9.6 → 24 g	$368 – $920
Thorn	16–22	4.7 → 12.7 g	$181 – $488
Double Line	16–22	6 → 13 g	$250 – $542
Fused Cross	16–22	3.7 → 9 g	$150 – $359
Signature Links V.1	16–22	2.7 → 6 g	$122 – $271
Signature Links V.2	16–22	2.1 → 5.5 g	$126 – $229
Triple Drills	15–22	3.1 → 4.5 g	$127 – $169

So an extra millimetre "just in case" on a heavy ring costs real money: on the Brutalism V.1, going from 18 to 19 mm adds about 3 g of silver. That is one more reason to measure precisely rather than size up for safety. The Thorn Ring carries the THORN form, the Fused Cross belongs to the FUSED family, and the two heaviest rings in the table are BRUTALISM. Every ring in the table is 925 silver, made to order in Bali in 2–4 weeks, often sooner.

Can a silver ring be resized after it is made?

Usually, yes. One resize of a STRUGA ring is free, with shipping to us and back paid by the owner. The exception is the Brutalism V.1 and V.3: a closed form with relief across the top, which does not survive resizing, so they are not resized once made. For those two, the size is settled before the order.

If the size is wrong on arrival, any ring from the catalogue can be exchanged once within 14 calendar days of delivery for another size: unworn, in its original packaging, with a Return Authorization agreed before you send it; shipping both ways is paid by the buyer. A ring made to your measurement through Custom Order in a non-standard size is final.

The resize is limited to one because every stretch or reduction is work on the shank, after which the silver is finished again. On a smooth band the trace barely shows; on texture and relief it does. The patina the ring has built up with wear starts again at the worked spot: the silver is bright again and darkens again with the hand.

What if my size is below 15 mm or above 22 mm?

Order the ring to your measurement. Anything outside the 15–22 mm range STRUGA makes as a Custom Order: you send the size in millimetres, the price is built to the brief rather than taken from a list, and the lead time is 2–4 weeks from sketch approval. Wedding and paired rings to measure have their own route, Dark Union.

Standard size charts usually stop somewhere between US 13 and US 16 — roughly 22 to 25 mm of diameter — so a large hand outside the mass-market range is common, not exceptional. At the small end the issue is proportion: a heavy 10 mm band on a 15 mm finger covers almost the whole phalanx. There, look at the slimmer pieces among the dark minimalist rings, where a band a few millimetres wide reads correctly.

Does a silver ring stretch over time?

Silver does not shrink. A thin shank can stretch, but slowly and slightly: years of pressure on a finger that has gained girth, or knocks against hard surfaces, open the ring and pull it from a circle towards an oval. A heavy shank holds its shape far longer than a thin one.

Far more often, the finger changes. Finger girth rises and falls with weight, age, pregnancy and season. A ring that fitted at 25 may not close at 45, and that is not a defect of the ring. Measure for the finger you have now, not the one you hope for.

Are lip ring sizes the same as finger ring sizes?

No — it is a different system. A lip ring is piercing jewellery, sized in two dimensions: the thickness of the wire (the gauge) and the inner diameter of the hoop or the length of the labret post. The common gauges are 16g, which is 1.2 mm, and 14g, which is 1.6 mm. EU, US and diameter finger charts do not apply to piercings.

STRUGA does not make lip jewellery; our piercing range is for the ear only. Ear cuffs are in the ear cuffs collection, earrings for the lobe in the earrings collection.

Size is one axis. What the ring itself is — signet, statement band, open ring — is in the rings atlas.