BMI Calculator

What is BMI and How is it Calculated?

The BMI Calculator helps you understand how body mass index is calculated and used as a screening tool for categorizing weight status. By entering your height and weight, you can learn how BMI is determined and what the different categories mean for health assessment. This tool is useful for exploring the relationship between body measurements and health guidelines.

BMI = weight (kg) / [height (m)]²

Example: A person who is 70 kg and 175 cm tall:

BMI = 70 / (1.75 × 1.75) = 22.86

BMI Categories

  • Underweight: BMI < 18.5
  • Normal weight: BMI 18.5–24.9
  • Overweight: BMI 25–29.9
  • Obesity: BMI ≥ 30

FAQs

  • What is BMI?
    BMI (Body Mass Index) is a number calculated from a person's weight and height. It is used to categorize individuals as underweight, normal weight, overweight, or obese.
  • Is BMI a good measure of health?
    While BMI is a useful screening tool, it does not directly measure body fat or account for muscle mass, age, sex, or ethnicity. It should be used alongside other health assessments for a more complete understanding of individual health.
  • What are the BMI categories?
    Underweight: BMI < 18.5, Normal: 18.5–24.9, Overweight: 25–29.9, Obesity: 30 or higher.
  • Can children use this BMI calculator?
    No, BMI for children and teens is interpreted differently and should use age- and sex-specific percentiles.

BMI Calculator