Free BMI Calculator
Calculate your Body Mass Index. Supports metric and imperial units. Free, instant.
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How to Calculate BMI
Enter your weight and height, then click Calculate. The formula is weight (kg) divided by height (m) squared for metric, or (weight in lbs / height in inches squared) × 703 for imperial. The color-coded scale shows your BMI category.
Why Use a BMI Calculator?
BMI is a widely used screening tool for weight categories. While it does not directly measure body fat, it provides a quick indicator of whether your weight is in a healthy range for your height. Consult a healthcare provider for a complete health assessment.
Frequently Asked Questions
What is a healthy BMI? A BMI between 18.5 and 24.9 is considered normal weight. Below 18.5 is underweight, 25-29.9 is overweight, and 30+ is obese.
Is BMI accurate for everyone? BMI does not account for muscle mass, bone density, or body composition. Athletes may have a high BMI despite being fit. It is a screening tool, not a diagnostic one.