Ask for a ring in Bangkok and the shop will ask for your size as a number, like 52 or 54. That number is the inside of the ring measured around, in millimetres. It is the same system used across most of Europe, so a Thai size 54 and a European size 54 are the same ring. In the US the same ring is a size 7.
This page puts all of them side by side, so you can order a ring here with confidence, or buy one at home in a size you know from Thailand.
Thai ring size to US size chart
Find your US, UK or Japanese size and read across, or start from the Thai number.
| Thai size (mm around) | Diameter | US | UK and Australia | Japan |
|---|---|---|---|---|
| 47 | 14.9 mm | US 4 | H | 7 |
| 48 | 15.3 mm | US 4.5 | I | 8 |
| 49 | 15.7 mm | US 5 | J½ | 9 |
| 51 | 16.1 mm | US 5.5 | K½ | 11 |
| 52 | 16.5 mm | US 6 | L½ | 12 |
| 53 | 16.9 mm | US 6.5 | M½ | 13 |
| 54 | 17.3 mm | US 7 | N½ | 14 |
| 56 | 17.7 mm | US 7.5 | O½ | 16 |
| 57 | 18.1 mm | US 8 | P½ | 17 |
| 58 | 18.5 mm | US 8.5 | Q½ | 18 |
| 60 | 18.9 mm | US 9 | R½ | 20 |
| 61 | 19.4 mm | US 9.5 | S½ | 21 |
| 62 | 19.8 mm | US 10 | T½ | 22 |
| 63 | 20.2 mm | US 10.5 | U½ | 23 |
| 65 | 20.6 mm | US 11 | V½ | 25 |
| 66 | 21.0 mm | US 11.5 | W½ | 26 |
| 67 | 21.4 mm | US 12 | X½ | 27 |
Thai shops use every whole number, so you will also see sizes like 50, 55 or 59. Those sit between two US half sizes. A Thai 55 falls between US 7 and US 7.5, and a Thai 59 between US 8.5 and US 9.
The Japanese size is easy to remember: take the Thai number and subtract 40. A Thai 52 is a Japanese 12.
How our product pages show sizes
Every ring on our site lists both systems together, so you never have to convert. A size reads US 6 (52), meaning US size 6, Thai and European size 52. Our family and birthstone rings come in these sizes:
- US 6 (52)
- US 6.5 (53)
- US 7 (54)
- US 7.5 (56)
- US 8.5 (58)
Every ring is made to order by our Bangkok artisans, so if your size is not on the list, message us before you order and we will tell you what we can do.
Find your size at home
From a ring you already own
This is the most reliable way. Take a ring that fits the finger you want, lay it on a ruler and measure straight across the inside, edge to edge. Find that number in the Diameter column above. If it falls between two rows, take the larger one.
With a strip of paper
Cut a thin strip of paper, wrap it once around the base of your finger and mark where it overlaps. Lay it flat and measure from the end to the mark in millimetres. That length is your Thai size. Keep the strip snug but not tight, and make sure it slides over your knuckle, because the ring has to.
Paper stretches and slips a little, so treat the result as a close guide. If you can, check it against a ring you own.
Compare with our chart
Our catalogs, charts and sizing page has a full ring size chart you can open and compare against your own ring.
Small things that change your size
Heat and air conditioning. Fingers are a little larger in the Bangkok heat and a little smaller in a cold room. Measure in the late afternoon at a normal temperature, and if you are between two sizes, choose the larger one.
Wide bands. A wide band sits on more of the finger and feels tighter than a thin one in the same size. For a band wider than about 6mm, go half a US size up.
Knuckles. If your knuckle is larger than the base of your finger, size for the knuckle so the ring can go on, and expect it to turn a little once it is there.
Which hand. Most people’s dominant hand is slightly larger. Measure the exact finger the ring is for.
Buying a ring as a gift
When the ring is a surprise, borrow one she already wears on the same finger and measure it with the ruler method. If that is not possible, a necklace or bracelet is the safe choice, since it needs no ring size at all. Our mother’s ring guide has more on choosing a size for someone else.
Questions people ask about ring sizes in Thailand
What is size 52 in Thailand in US size?
A Thai size 52 is a US size 6, a UK L½ and a Japanese 12.
Is a Thai ring size the same as a European size?
Yes. Both measure the inside of the ring around, in millimetres, so the numbers match.
What is the most common women’s ring size?
Many women wear between US 6 and US 7, which is Thai 52 to 54. Hands vary a lot, so measure rather than guess.
What if I order the wrong size?
Message us as soon as you notice. Because every ring is made to order, it is always easier to get the size right before we start, so ask us if you are unsure.
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