Generally speaking, the height of a boy is 1m8, and the corresponding shoe length should be **26 to 27cm * *. According to the general rule, the corresponding relationship between height and shoe size is: height ×6.8= shoe length (unit: cm). Therefore, for boys with a height of 1.8m, the corresponding shoe length should be about 26 to 27 cm.

But please note that this is only a general reference. Everyone's foot type and size are different, and the specific shoe length should be subject to personal measurement. Meanwhile, different brands and styles of shoes may be slightly different.