Safety shoes size algorithm

The size of the shoes, also known as the shoe number, is commonly followed by the following standards: International, European, United States, and British.
How the conversion of the size of labor insurance shoes in the end, this may not many people do not know, now I'll tell you:
For example, I wear 42 yards of shoes, but the shoes are written on the 26, how can I know how to 42? Then as the following conversion: 26*2-10=42; is your number... ....
In other words, the law of the size of shoes is:
“One of the two shoe sizes we use is the Anglo-American system, which is generally a relatively large one, and one that is developed in our country is a smaller one. Conversion formula: Chinese system × 2-10 = Anglo American system
For example: Your feet are 25 cm long
25×2-10=40 yards You should be able to count it upside down. ”
The international standard shoe number indicates the length of the foot in millimeters.
Chinese standards use millimeters or centimeters. For example, 245 is the number of millimeters and 24 1/2 is the number of centimeters, which means the same size.
The People's Republic of China Light Industry Standard QB/T1002-2005 "Leather Shoes", and this standard shall be formally implemented on September 1st, that is, the new shoe number will no longer use the Eurocode and will be marked in millimeters. Conversion formula: (European code +10) x 5 = Chinese shoe number, such as the Euro code 35 shoe, the corresponding Chinese shoe number is 225; the European code 37 corresponds to the Chinese shoe number is 235. Specifically: 34 - 220MM; 35 - 225MM; 36 - 230MM; 37 - 235MM; 38 - 240MM; 39 - 245MM; 40 - 250MM; 41 - 255MM; No. 42 - 260MM; No. 43 - 265MM; No. 44 - 270MM; No. 45 - 275MM. There are 0.5 plus 2.5MM.
In addition, the conversion formula with other countries or regions is:
Number of centimeters x 2-10 = European system (Europe +10) ÷ 2 = centimeters
Number of centimeters -17.5 = American-made American +17.5 = centimeters
Centimeter -18.5 = Imperial English +18.5 = centimeters
Shoe number comparison table:
Women's shoes
The length of the foot is 22.5 23 23.5 24 24.5 25 25.5 26
Europe EUR 35 36 37 38 39 39 40 40
US US 5 5.5 6 6.5 7 7.5 8 8.5
United Kingdom UK 4 4.5 5 5.5 6 6.5 7 7.5
Men's shoes
Feet length cm 24.5 25 25.5 26 26.5 27 27.5 28
Europe EUR 39 40 41 42 43 44 45 46
US US 7 7.5 8 8.5 9 9.5 10 10.5
UK UK 6 6.5 7 7.5 8 8.5 9 9.5
(Attach: 1 yard = 0.9144 centimeters; 1 yard = 36 inches; 1 inch = 2.54 centimeters)

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