I am 1.68 meters.

http://www.mold.net.tw/classroom/unit.htm
..單位換算的網頁
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1公分=0.0328呎(feet)
122公分=4.0016呎(4 feet)
He is 1.22 meters / 4 feet.
他是1.22米/ 或稱4呎

I am 1.83 meters / 6 feet.
183 X 0.0328=6.0024 feet
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A: How tall is he?
B: He is 1.68 meters. (5.5呎)
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他68公斤=?磅 (149.91416磅 即大約150磅)(輕)
1公斤=2.20462磅 (請參考上方網址換算)
1磅=0.45359公斤
336磅=152.4公斤 (重)
84磅=38.1公斤 (輕)
126磅=57.15公斤(輕)

A: How heavy is he?
B: He is 150 pounds.
A: Is he heavy?
B: No, he isn't.

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How tall are you ?
How heavy are you ?