What is the average weight for a 15 year old girl who is 5'4?

Growth Chart estimat. Your ideal weight really depends on your genetics and activity level (muscle weighs more than fat!) but a quick way to estimate a proportional weight for a height of 64 inches is to use a growth chart such as the one pictured. Height for age plots in the 50th (average percentile), and a proportional weight would be approximately 120 lbs. BMI calculation may be more useful.
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