Enter Your Height and Weight
Input your height in centimeters or feet and weight in kilograms or pounds. Our BMI calculator online free supports both metric and imperial units for users worldwide.
BMI Calculator
Enter your height and weight to calculate your Body Mass Index (BMI). The result includes your BMI value, a visual indicator on the BMI scale, and weight category classification (underweight, normal, overweight, obese).
Workspace
Use the tool below. Your inputs stay local when the tool supports browser-only processing.
Workflow
How to use the BMI Calculator
Click Calculate BMI
Press calculate and the tool processes your numbers using the standard BMI formula. This BMI calculator online free delivers your BMI value and category within seconds.
Interpret Your BMI Category
Review your BMI score and weight category — underweight, normal, overweight, or obese — displayed with a visual scale indicator. Use this BMI calculator online free to track your health metrics.
BMI Calculator — Frequently Asked Questions
How does a BMI calculator online work?
A BMI calculator online uses the formula weight (kg) / height² (m²) to calculate your Body Mass Index. Simply enter your height and weight and the tool instantly computes your BMI value and places you on the standard BMI scale.
Is this BMI calculator online accurate for all body types?
This BMI calculator online is accurate for the general population as a health screening tool. However, athletes, pregnant women, and elderly individuals may get less accurate results because BMI does not distinguish between muscle and fat mass.