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Calculators

BMI (Body Mass Index) Calculator

BMI Category
Below 18.5 Underweight
18.5-24.9 Normal Weight
25-29.9 Overweight
30-39.9 Obese
40 and above Morbidly Obese

What does BMI stand for?

BMI stands for Body Mass Index, and it is an assessment of your weight relative to your height. Our BMI Calculator will calculate your BMI for you, and don't worry if you measure yourself in pounds, feet or centimetres. We'll convert the numbers to fit the equation.

The results of the BMI calculation are categorized as follows, in the table on your right.


Calculate your BMI

Body Mass Index (BMI)

Height (inches or cm)
Weight (pounds or kilos)
I am submitting my measurement in


BMI Accuracy

The BMI equation does not take into account your body composition (percent muscle vs. fat) and is therefore less accurate if you have a non-typical amount of muscle. This is because while a person with an above average amount of muscle is likely to be healthier because of it, the equation simply interprets the added muscle as fat and overestimates obesity. The problem is compounded by the fact that muscle weighs more than fat.

Conversely, with older persons and others with a below average amount of muscle, the BMI equation underestimates obesity.

Two people can have the same BMI, but a different percent body fat. A bodybuilder with a large muscle mass and a low percent body fat may have the same BMI as a person who has more body fat because BMI is calculated using weight and height only. These men have the same height, weight, and BMI, but may have different percent body fat.

Muscle Guy
6'3" Height 6'3"
220 lbs Weight 220 lbs
27.5 BMI 27.5
Fat guy

This is a good reminder that BMI is only one piece of a person's health profile. It is important to talk with your doctor about other measures and risk factors. (e.g., waist circumference, smoking, physical activity level, and diet.)

Because of this discrepancy, if you are gaining (or losing) a significant amount of muscle with your weight loss program, checking how your clothes fit might be a better way to monitor your progress than to recalculate your BMI.

A more accurate assessment of weight can be made by measuring the percentage of body fat that makes up your body. Your doctor or local health club can likely do this, or you can purchase a home scale that has the capability to estimate body fat percentage.
 


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