Before we start calculating BMI, let’s discuss what BMI is, and what it isn’t. BMI, or the body mass index, is a tool that’s used to determine whether or not a person is at a normal weight for his or her height. It was invented between 1830 and 1850 by mathematician and scientist Adolphe Quetelet. Though it’s been almost 200 years since he created the BMI, it’s used today almost exactly as he outlined.
While BMI isn’t the final word in whether or not someone is at a normal weight, it’s one of the first tools often used to determine if someone’s overweight. Because the BMI doesn’t distinguish between weight from fat and weight from muscle (other tools must be used to determine the actual amount of fat) it doesn’t work well for very muscular people like athletes. But for most of us, BMI is a pretty accurate measure of whether we’re underweight, a normal weight, overweight or obese.
Calculating BMI isn’t difficult once you understand the formula. The basic formula is weight divided by height squared, or kg/m2. You simply take your height in meters and square it which means you take the number...
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