BMI Calculator
Calculate your Body Mass Index and understand your health range.
How it works
Enter your height and weight (in metric or imperial units) and click Calculate. The free BMI calculator instantly computes your Body Mass Index using the formula BMI = weight(kg) / height(m)² and tells you whether you are underweight, normal weight, overweight, or obese.
Why use this tool?
BMI is the most widely used screening tool by doctors and fitness professionals to assess body weight relative to height. Track your BMI over time to monitor health progress and set realistic fitness goals.
Frequently Asked Questions
What is a healthy BMI range?
According to WHO: Under 18.5 is underweight, 18.5–24.9 is normal, 25–29.9 is overweight, and 30 or above is obese.
Is BMI accurate?
BMI is a useful screening tool but doesn't account for muscle mass, bone density, or fat distribution. Athletes may have high BMI despite low body fat.
Does this BMI calculator use metric or imperial?
Both. You can enter height in cm or feet/inches, and weight in kg or pounds.
Is BMI different for children?
Yes. For people under 18, BMI is interpreted using age and gender-specific growth charts, not the standard adult ranges.
Rate this tool:
Was this tool helpful?