Body Mass Index (BMI) is a quick screening measure that relates your weight to your height. Use the sliders to see your BMI and category.
Under 18.5 Underweight · 18.5–24.9 Normal · 25–29.9 Overweight · 30+ Obese
These calculators give you a starting point. SmartEat turns the numbers into AI-personalized meal plans, food tracking, and guidance backed by certified nutrition expertise.
Body Mass Index is a simple ratio of weight to height: weight (kg) ÷ height (m)². It is widely used as a quick screening tool for weight categories that may indicate health risk.
Important: BMI does not distinguish muscle from fat and does not measure body composition or fat distribution. Athletes and very muscular people may have a high BMI while being healthy.
BMI is a useful population-level screening tool but not a diagnosis. It does not account for muscle mass, bone density, or where fat is stored, so it should be interpreted alongside other measures and professional advice.
For most adults, the World Health Organization considers a BMI between 18.5 and 24.9 to be the normal range.
Not reliably. Muscular individuals often register as "overweight" by BMI despite low body fat, because muscle weighs more than fat.