BMI Calculator
The BMI Calculator estimates your Body Mass Index from your height and weight, a widely used general screening measure for weight categories.
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How This Tool Works
Choose imperial or metric units, enter your height and weight, and get your BMI along with its standard weight category.
Formula & Method
BMI = weight (kg) ÷ height (m)². Categories: under 18.5 (underweight), 18.5–24.9 (healthy), 25–29.9 (overweight), 30+ (obesity).
Example Calculation
A person 5'9" tall weighing 165 lb has a BMI of about 24.4, in the healthy weight range.
Frequently Asked Questions
What is a healthy BMI?+
A BMI between 18.5 and 24.9 is generally classified as a healthy weight range for most adults, though it doesn't account for muscle mass or body composition.
Is BMI accurate for athletes?+
Not always — muscular individuals often show a higher BMI despite having low body fat, since BMI doesn't distinguish between muscle and fat mass.
Should I make health decisions based on BMI alone?+
No, talk to a healthcare provider — BMI is a general screening tool, not a diagnostic measure, and other factors like waist circumference and body composition matter too.
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