BMI Calculator

ToolkitCenter Math Tool

BMI Calculator

Calculate your Body Mass Index online for free. Enter height and weight to check your BMI score and general weight category instantly.

Calculate BMI

BMI is calculated from height and weight. It is commonly used as a general adult body weight indicator.

BMI is for general information only and does not replace medical advice. It may not accurately reflect body composition for athletes, children, pregnant users, older adults, or people with high muscle mass.

BMI Result

Your BMI Score

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Enter your height and weight.

Your general BMI category will appear here.

Unit system Metric
Weight -
Height -
BMI formula kg / mΒ²

Recent BMI Calculations

Your BMI history will appear here.

Ready for BMI calculation.

Free Online BMI Calculator

ToolkitCenter's BMI Calculator helps you calculate your Body Mass Index directly in your browser. Enter your height and weight to estimate your BMI score and see a general weight category such as underweight, normal weight, overweight, or obese.

Calculate Body Mass Index from height and weight

This free BMI calculator is useful for quick health-related calculations, fitness tracking, weight monitoring, wellness planning, and understanding how BMI is commonly used as a basic body weight indicator. It supports metric and imperial units and provides fast results without installing any software.

BMI categories used by this calculator

  • Underweight: BMI below 18.5
  • Normal weight: BMI from 18.5 to 24.9
  • Overweight: BMI from 25 to 29.9
  • Obese: BMI 30 or higher

Important note

BMI is a general informational measurement and does not replace medical advice. It may not accurately reflect body composition for athletes, children, pregnant users, older adults, or people with high muscle mass. For personal health decisions, consult a qualified healthcare professional.