Ring size

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Ring size is a measurement used to denote the circumference of jewellery rings.

Video Ring size

Systems

There are several systems for denoting the sizes of jewellery rings in use around the world:

• The ISO standard for ring sizes is ISO 8653:2016, which defines standard ring sizes in terms of the inner circumference of the ring measured in millimetres.
• In the United States and Canada, ring sizes are specified using a numerical scale, with quarter and half sizes. An increase of a full size is an increase of 0.032 inch (0.8128 mm) in diameter, or roughly 1/10 inch (more precisely, 0.1005 in or 2.55 mm) in inside circumference.
• In Ireland, the United Kingdom and Australia, ring sizes are specified using an alphabetical scale, with half sizes.
• In India, Japan and China, ring sizes are specified using a numerical scale, that only has whole sizes, and does not have simple linear correlation with diameter or circumference.
• In Austria, France, Germany, Belgium and Scandinavia, ring sizes are specified using actual internal circumference in mm (the same as the ISO standard). In some countries, half sizes may be used.
• In Italy, Spain, Netherlands, and Switzerland, ring sizes are specified as the circumference minus 40mm. A 50 in Germany will be a 10 in Switzerland.

Before accepting the equations and values in the article, consider the multiple dissenting opinions listed in the talk page and other sites.

For the system prevailing the United States, the Circular of the Bureau of Standards summarizes the situation as: "While there apparently is only one standard in use in the United States, in reality, because of the lack of specific dimensions and because of the errors introduced by the adoption of a common commercial article as a pattern, there are many, although similar, standards." There does not appear to have been any improvement in the standard since then.

Maps Ring size

Equations

To convert from US, Canada and Mexico ring sizes (s) to ISO 8653:2016 circumference:

${\displaystyle c=2.55\times s+36.5}$

and for diameter:

${\displaystyle d=0.8128\times s+11.63}$

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Chart

Ring sizes can be measured physically by a plastic or metal ring sizer, or by measuring the inner diameter of a ring that already fits. There are also online measuring tools available. Online measuring tools vary, but many offer multiple ways to measure the ring size, such as wrapping a paper cutout around the finger, or measuring a current ring according to a chart.

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References

Source of article : Wikipedia