The complete Vietnamese ring measurement guide for 2026 โ calculate a local ni nhแบซn size from finger circumference or an existing ring, compare EU ยท US ยท UK conversions, use a calibrated printable gauge and confirm the correct fit before buying jewellery in Vietnam.
The ranges above are examples published by PNJ, not universal gender rules. Individual fingers and brand charts vary.
A bare ring-size number is ambiguous internationally. The same number can mean a Vietnamese local ni, a US size or an EU circumference size. The physical measurement removes most of that ambiguity. Record either inner diameter, such as 16.1 mm, or circumference, such as 50.6 mm, then use the retailer's chart.
| ๐ป๐ณ Vietnamese Ni Size | ๐ Inner Diameter (mm) | โญ Circumference (mm) | โญ Circumference (cm) | ๐ช๐บ EU Approx. | ๐บ๐ธ US Approx. | ๐ฌ๐ง UK Approx. | ๐ค Typical Use |
|---|
The local diameter values in this chart reproduce the size sequence published by DOJI for common Vietnamese ring sizes. Always check the actual retailer because local charts may differ.
A ring finger on the left hand may not match the same finger on the right. Decide where the ring will be worn before measuring. Remove other rings and allow the hand to return to a normal temperature.
Use paper approximately 5โ10 mm wide. Avoid elastic string, thick cord and stretchy fabric because they can compress or lengthen and produce a size that is too small.
Place the strip around the base of the intended finger. It should touch the skin all the way around but should not leave a deep mark. Test whether the loop could pass over the knuckle.
Use a fine pen to mark where the paper meets. A thick line can add enough uncertainty to move the result toward another local ni size.
Lay the strip completely flat, measure from the starting edge to the mark and enter that circumference above. PNJ recommends repeating the measurement three or four times because home sizing can vary.
Keep the physical millimetre reading. When the seller uses a different local chart or European sizes, use diameter or circumference to identify the closest available option.
Use a ring that fits the intended finger comfortably. A ring from another finger can create a misleading result.
Place the ring flat and measure straight across the centre from inside edge to inside edge. Do not include the metal band.
Turn the ring approximately 90 degrees. Matching readings indicate a round ring; different readings can mean the ring is oval or the ruler was misaligned.
In the common Vietnamese reference used here, an inner diameter near 16.1 mm corresponds to ni 10. The same physical ring is approximately EU 51, US 5ยฝ and UK K, depending on how a particular international chart rounds.
Print this page using Actual Size or 100%. Disable โFit to page,โ โShrinkโ and browser scaling. First measure the 50 mm calibration line. If it is not exactly 50 mm, the circles are not reliable.
Local ni numbers do not follow one universal mathematical formula. Match the number to the brand's listed millimetres.
Example: 16.1 mm ร 3.1416 โ 50.6 mm.
Example: 50.6 mm รท 3.1416 โ 16.1 mm.
A 50.6 mm circumference normally rounds near EU 51.
US sizes use a separate numbered scale, so conversion requires rounding to a listed step.
UK sizes use letters and half letters. Keep the metric reading when precision matters.
Outdoor heat can make fingers fuller than they are in a cool shop or air-conditioned room.
A broad wedding band often needs more room than a thin fashion band.
The ring must pass the knuckle while remaining reasonably secure at the base.
Measure the exact hand rather than copying the size from the opposite hand.
Elastic thread can tighten during measuring and lead to a ring that is too small.
Rounded interiors can feel different from flat interiors despite a similar diameter.
Thin fashion rings and many engagement-ring shanks usually feel less restrictive. A carefully measured home result may be close to the final choice, but the stone setting and ring profile can still affect balance and spinning.
A broad ring covers more skin and resists movement, making the same internal opening feel tighter. Two or three stacked rings can have a similar effect. Do not automatically add a fixed amount; test a sample band of similar width.
Before purchase, ask what happens if the ring is too tight or loose. Simple gold or platinum bands are often easier to resize than full-eternity rings, tension settings, patterned bands, some plated jewellery and rings with stones around most of the circumference.
The following external pages were accessible when this page was prepared on 3 August 2026. They are included because they directly support Vietnamese terminology, local size examples, home measuring methods or international measurement standards.