BMI Calculator
Calculate your Body Mass Index (BMI)
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⚙️ How It Works
Simply enter your current height and weight. Our tool uses standard health formulas to calculate your exact BMI number and visually indicates which World Health Organization weight categorization you fall into.
❓ Frequently Asked Questions
What is a healthy BMI?
According to the WHO, a normal, healthy BMI falls between 18.5 and 24.9. A BMI under 18.5 is considered underweight, 25.0 to 29.9 is overweight, and 30.0 or higher is obese.
Is BMI an accurate measure of health?
BMI is a highly useful screening tool but does not directly measure body fat. Muscle mass, bone density, and overall body composition can affect your weight, so athletes might have a high BMI without excess fat.
How is BMI calculated?
BMI is calculated by dividing an adult's weight in kilograms by their height in meters squared (kg/m²). Our calculator handles this math instantly.
Does the BMI Calculator work offline?
Yes, the BMI Calculator is fully functional offline. Because this tool runs entirely in your browser, no data is ever uploaded to external servers. Once the page is loaded, you can seamlessly continue using it without an active internet connection. You can also install Knicknaks as a Progressive Web App (PWA) for native-like offline access.