New BMI Calculator

The new, more accurate method of calculating BMI is based on a British mathematician’s formula, which makes shorter people appear heavier and taller people appear slimmer. The new method takes into account the distortion caused by height more effectively.

Fill in the spaces above with your height and weight. The calculator provides your BMI as well as an explanation of what it means.

Please keep in mind that BMI is simply a rough estimate of weight when calculated this method. BMI is always influenced by physical appearance, muscularity, and other aspects. Compare this to the standard BMI calculation.

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When Is BMI Useful?

For a vast majority of the population, BMI accurately identifies whether a person is overweight or obese and at risk of disease. It’s straightforward to measure because no extra adjustments to the formula are required for age or gender. BMI is still computed the same way for children and teenagers, but the results are interpreted differently to account for age and gender, as girls naturally gain weight as they enter puberty.

A physical check by your doctor should be able to assess whether your bodybuilding practice renders BMI an inaccurate measure for you. Because the BMI calculation cannot be modified, bodybuilders should avoid using it as a measure of obesity.

What Does BMI Measure?

According to the National Institutes of Health, the BMI uses your height and weight to determine how much body fat you have (NIH). To establish if you are underweight, normal, overweight, or obese, this algorithm uses general averages.

According to the Centers for Disease Control and Prevention, calculating BMI is as simple as dividing your weight in kilograms by your height in meters squared (CDC). If you prefer to work in pounds and inches, the formula is as follows:

BMI=[weight / (height × height)] x 703

BMI Chart

CategoryBMI Range
Morbidly underweight0 – 14.9
Significantly underweight15 – 17.9
Slightly underweight18 – 18.9
Normal weight19 – 24.9
Slightly overweight25.0 – 29.9
Significantly overweight30.0 – 34.9
Severely obese35.0 – 39.9
Morbidly obese40.0 or more

BMI Calculations Using Waist Circumference

Body mass index (BMI) overestimates body fat in bodybuilders and underestimates fatness in people of average weight who have little muscle mass but carry a lot of extra pounds around the middle. Measurement of waist circumference may be a better indication of health for both of these populations. If your waist circumference is greater than 40 inches for males and 35 inches for women, you may have too much visceral, or intra-abdominal, fat.

This form of fat is metabolically active and surrounds the internal organs, increasing your risk of chronic diseases including heart disease and Type 2 diabetes. You may have a larger-than-expected waist size if you have a thicker midsection due to developed abdominal and back muscles, even if you don’t carry a lot of visceral body fat.

Percentages of Body Composition

Body composition – the ratio of lean mass to fat mass, or body fat percentage — may be a more accurate indicator of health for bodybuilders. Muscle, bone, organ, and fluid weight make up lean mass. While there are no absolute body fat percentages, most athletic males have a body fat percentage of 5 to 13, and most athletic women have a body fat proportion of 12 to 22 percent. Bodybuilders preparing for competition are usually on the lower end of this spectrum. If your weight and definition fluctuate significantly during the off-season, you may end up with an unhealthy body fat percentage, especially if you’re trying to bulk.

A guy should have between 10 and 25 percent body fat, while a woman should have between 18 and 30 percent. Women require about 8% essential fat while men require about 5% essential fat to support vital physiological functions such as hormone synthesis and vitamin absorption. Obesity and illness risk is linked to fat levels of more than 25% for males and more than 30% for women.

A body fat scale calculates your body fat percentage. Consult a fitness professional to be assessed with body fat calipers, or undergo underwater weighing or a DEXA scan in a medical setting for more reliable results.

Medical Evaluations as BMI Substitutes

A BMI that indicates overweight or obesity aids your doctor in determining whether you are at an elevated risk of heart disease. When your BMI is off, your doctor can use your family history, whether you smoke, and specific blood tests to determine your risk. Blood cholesterol, blood sugar, and blood pressure are all significant health indicators that should be checked on a regular basis.

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