BMI Calculator interactive tool
Calculator
Body Mass Index (BMI) is weight in kg divided by height in meters squared. It is a screening tool, not a measure of body fat or health.
Result
24.2
Normal
What Is BMI?
Body Mass Index (BMI) is a screening measure calculated from weight and height. It is commonly used to group adults into broad weight categories, but it does not directly measure body fat or diagnose a health condition. This BMI calculator helps you see the category associated with the number.
BMI Categories and Healthy BMI Range
- Underweight: BMI less than 18.5
- Normal weight: BMI 18.5 to 24.9 (an adult reference range, not a complete health assessment)
- Overweight: BMI 25 to 29.9
- Obese: BMI 30 or greater
Limitations of the BMI Calculator
While BMI is a useful general guideline, it does not directly measure body fat. This means it has significant limitations: athletes with high muscle mass may be classified as "overweight" or "obese" despite having very low body fat percentages. Similarly, older adults who have lost muscle mass might fall into the "normal" range while actually carrying excess body fat. Always consult a healthcare provider for a comprehensive health assessment, as this BMI calculator is a screening tool, not a diagnostic one.
How To Use the BMI Calculator
- Choose your preferred measurement system: metric (kilograms, centimeters) or imperial (pounds, feet/inches).
- Enter your weight and height accurately into the designated fields.
- Review your Body Mass Index and the corresponding adult BMI category shown by the calculator.
- Use the Example button to load sample values for a quick demonstration, or Reset to clear all fields and start a new calculation.
BMI from height and weight
Use this BMI calculator to calculate body mass index from height and weight and see the associated adult reference category. BMI is a screening measure and does not diagnose health or describe body composition.
Need the formula or convention behind this result? Read the calculator methods and assumptions.