BMI Calculator

BMI (Body Mass Index) is a numerical value calculated from your weight and height. The formula is: BMI = weight (kg) / height (m) squared. For imperial units, the formula is BMI = (weight in pounds / height in inches squared) x 703. BMI is used as a quick screening tool to categorize individuals into underweight, normal weight, overweight, or obese ranges.

A healthy BMI falls between 18.5 and 24.9. A BMI below 18.5 is classified as underweight, 25 to 29.9 as overweight, and 30 or above as obese. However, these ranges are general guidelines. Factors like age, sex, muscle mass, bone density, and ethnicity can affect what is a healthy weight for an individual. Always consult a healthcare professional for a comprehensive assessment.

BMI has limitations for athletes and muscular individuals. Since muscle weighs more than fat by volume, people with high muscle mass may have a high BMI despite having a low body fat percentage. BMI does not distinguish between muscle and fat tissue. For athletes or people who exercise regularly, other measurements like body fat percentage, waist circumference, or waist-to-hip ratio may provide a more accurate picture of health.

The standard BMI formula is the same for men and women, and the category thresholds (underweight, normal, overweight, obese) are identical. However, women naturally tend to have a higher body fat percentage than men at the same BMI. Some health organizations suggest interpreting BMI alongside waist circumference and other metrics to account for sex-based differences in body composition.

The Dewx BMI Calculator supports both metric and imperial units, shows a visual BMI gauge with color-coded ranges, displays your healthy weight range for your height, and includes a complete BMI categories table. Beyond free tools, Dewx is a complete business operating system with a unified inbox, CRM, outreach automation, AI assistant, and analytics, built for professionals who need more.