Standard Body Mass Index, which is BMI, charts indicate that a "normal" weight range for an adult 5'7" is approximately between 121 pounds (19 BMI) and 153 pounds (24 BMI). This would be the optimal weight of a 5'7" person. Your age and gender may also have some factors, however. Depending on your sex, the average BMI will change. Women generally have more body fat than men. Again age can change the exactness, but between 121-153 lbs is a general estimate.
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