Body Mass Index (BMI) is a widely used method to estimate whether a person has a healthy body weight relative to their height. It is commonly used in medical screenings, fitness assessments, and general health evaluations.
In this guide, you’ll learn how BMI is calculated, what the BMI ranges mean, and when BMI may not give a complete picture of health.
BMI Formula:
BMI = weight (kg) ÷ height² (m²)
Example:
If your weight is 70 kg and your height is 1.75 m:
BMI = 70 ÷ (1.75 × 1.75) = 22.9
BMI is a useful screening tool, but it does not directly measure body fat. People with high muscle mass, such as athletes, may have a higher BMI without having excess body fat.
Similarly, BMI does not account for age, gender, bone density, or fat distribution. Because of these limitations, BMI should be considered as a general guideline rather than a medical diagnosis.
For health-related concerns, consulting a qualified healthcare professional is recommended.
If you want to quickly calculate your BMI without manual effort, you can use our free online BMI Calculator for instant results.
Open BMI CalculatorThis guide is published by the HyperTools team to help users understand BMI calculation, health classifications, and common misconceptions. Our aim is to provide clear educational content alongside free tools that simplify everyday calculations.