EMG Health Numbers: Body Mass Index Calculator
Body Mass Index (BMI) is a popular method, which health care professionals use to evaluate body composition based on an individual’s height and weight. A normal, healthy BMI is between 18.5 and 24.9, a BMI between 25 and 29.9 is overweight and a BMI greater than 30 is obese. A BMI below 18.5 is considered underweight.1
To use the Body Mass Index calculator, enter your information into the provided BMI Calculator with height in inches and weight in pounds. The chart below categorizes the ratios and provides a description.
Limitations of Body Mass Index
While Body Mass Index is a well-known method for measuring body composition, it is not necessarily the best. BMI does not take into account an individual’s body type or composition (the ratio of muscle mass to fat mass. This causes the ratio to be inaccurate for men with a higher percentage of muscle mass and a lower percentage of body fat.1
For example, a man who loses 10 lbs of fat and gains 10 lbs of muscle will have the exact same BMI but will likely be much healthier. Therefore, BMI may not be an accurate predictor of common health problems such as diabetes, high blood pressure, and heart disease in certain individuals. Another, potentially more accurate numerical assessment of overall health is the waist-to-height ratio (See EMG Health Numbers: Waist to Height Ratio).
Body Mass Index |
Description |
| <18.5 | Underweight |
| 18.5 – 24.9 | Normal Weight |
| 24.9 – 29.9 | Overweight |
| 30.0 – 34.9 | Obese (Class 1) |
| 35.0 – 39.9 | Obese (Class 2) |
| > 40.0 | Morbidly Obese |
EMG Health Numbers Homepage: Health Numbers
External Resources: NIH: Body Mass Index