Calculation method of proper bracelet inner diameter: put five fingers together, measure the circumference of the thickest part of the bracelet with a soft rope in the thinnest state, then divide it by 3. 14, and add 1-2 mm to get the proper bracelet inner diameter.

For example, if the measured length is 170mm, then170/3.14+1~ 2 = 55 ~ 56mm. Different brands and different materials have different bracelet sizes. Please ask the shopping guide for the number 19.

Most people's hand inches are between 4 and 26. The safest way to measure is to ask the clerk in the jewelry store to measure: find a string or a piece of paper, draw a circle where the finger will wear the ring, mark the overlapping part of the rope or paper with a pen, and then measure its length with a ruler and compare it with the hand inch comparison table.

Extended data:

Hand inches are expressed in millimeters and numbers. According to the international standard ISO 8653: 1986 (China district), the minimum hand size is 39. 1mm, and the diameter is 12.5mm, which is set to NO. 1; The maximum hand inch has a circumference of 69.7mm and a diameter of 22.2mm, and is set to No.27, with 27 numbers. Among them, 1 to 5 belongs to children's hand inches, and adults' hand inches are between 6 and 27. 12 is the most common adult female. 18 is the most common adult male. These two numbers are followed by the number 3, which is the most common number of hands.

The number of hands is divided according to the circumference and diameter of the inner ring, and the conversion formula of circumference and diameter is: D=C/π.

Where: d is the diameter of the circle, mm;

C-circumference, mm;

π-π。

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