The BMI (Body Mass Index) charts are used to find where your height and weight intersect on the chart to indicate your BMI. Or you can use this easy calculator on the Centers for Disease Control and Prevention (CDC) site, where you can also find more information on why the BMI calculations are useful. (see link to site below).
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On a BMI chart, there should be instructions or details on how to read the chart! If not, then it would be a good idea to ask a physical instructor or someone who has experience.