Overview
What Is BMI?
Body Mass Index (BMI) is a measure that uses your height and weight to estimate whether you're in a healthy weight range, calculated as weight divided by height squared.
Calculate your Body Mass Index and weight category instantly.
Body Mass Index (BMI) is a measure that uses your height and weight to estimate whether you're in a healthy weight range, calculated as weight divided by height squared.
Useful as a general screening tool - note that BMI doesn't account for muscle mass, bone density, or body composition.
Input your height in feet/inches or centimeters.
Input your weight in pounds or kilograms.
Your BMI and weight category update automatically.
Generally, 18.5-24.9 is considered a healthy weight range for adults, though this varies by individual health context.
No, BMI doesn't distinguish between muscle and fat mass, so it can be less accurate for athletes or very muscular individuals.
BMI = weight (kg) ÷ height (m)², or weight (lb) ÷ height (in)² × 703.
No, children and teens use age- and sex-specific BMI percentiles, different from the adult formula.
25.0-29.9 is typically categorized as overweight, though individual health context matters.
30.0 and above is typically categorized as obese under standard BMI classifications.
No, BMI is one general screening tool - consult a healthcare provider for a complete health assessment.
No, BMI doesn't distinguish where fat is stored, which can also be health-relevant.
No, calculations happen entirely in your browser.
Yes, completely free with no sign-up required.