Calculate your Body Mass Index instantly with your weight and height — 100% free and private.
BMI (Body Mass Index) is a measure of body fat based on your weight and height. It's a simple and widely used tool to categorize whether you are underweight, normal weight, overweight, or obese.
BMI is calculated by dividing your weight in kilograms by your height in meters squared. The formula is: BMI = weight (kg) ÷ height (m)². Our calculator does this instantly for you.
The standard BMI categories are:
While BMI is a useful screening tool, it doesn't directly measure body fat. It may not be accurate for athletes with high muscle mass, pregnant women, or older adults. For those cases, other assessments may be more appropriate.
Yes! Kognitrick BMI Calculator is completely free to use. No registration, no hidden charges, no credit card required. Use it as many times as you want.
Absolutely! Your privacy is our top priority. All calculations are performed entirely in your browser using JavaScript. Your weight and height never leave your device — we do not store, track, or share any of your personal information.
This tool is useful for: