I was looking for similar info
my 10 year old boy
does 16 1/2 and people seemed inpressed
Michael's Answer
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I'm 10 and I do 21 inches, so I would say 18 inches, If you train.
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31 inches
46
100 inches
thats above average but compared to mine, 7.5 is a tic tac ;)
Many jewelry store websites have charts showing the ideal bracelet length for every age range. Since the recommended bracelet length for a 12-year-old is 6.75", the average wrist circumference of a 12-year-old is likely to be 5-6 inches.There seems to be a rumor floating around the internet that 12-year-olds have 5cm wrists. This is either a measurement of something other than wrist circumference (most likely diameter), or the person who came up with that figure has never looked at a tape measure.