170cm 即5呎幾呀?

http://manuelsweb.com/in_cm.htm
170 cm = 66.9 in = 5呎7左右。
通常，男生的身高（釐米數）減去105就是比較健康的公斤數，上下浮動在5公斤左右都算正常；如果是女生則要減去110。

1 inch is approx. 2.54 cm. Now you are 170 cm.

The corresponding height is ( 170 / 2.54 ) inches = 66.93 inches

Hence, after simple rounding off, 170 cm is around 5 feet 7 inches.

For a boy of 15 years old, there is no standard height but I think he should be at least 5 feet 4 inches, depending on whether he still has a chance to grow up.

I have a friend who was 5 feet 3 inches in S.3, then 5 feet 4 inches in S.4. After the summer vacation he suddenly grew up a lot and he was finally 5 feet and 11 inches in S.6. His parents are short, so it does no relate to the genes. There is no usual rule .... even scientists cannot concretely explain. But my friend likes to play basketball. Do you trust it helps?

Hope my answer can help you.