BMI is a useful population-level screening tool but doesn't distinguish muscle from fat. Athletes often score 'overweight' despite low body fat. For a complete picture, also check body fat percentage.

What is a healthy BMI?

WHO defines normal weight as 18.5–24.9. Underweight <18.5, overweight 25–29.9, obese ≥30.

Health

BMI Calculator

Compute your Body Mass Index using metric or imperial units. Includes WHO category, healthy weight range, and color-coded indicator.

Limitations of BMI

Doesn't distinguish muscle from fat — athletes score high
Doesn't account for age, sex, or ethnicity
Doesn't tell you where fat is distributed (belly fat = higher risk)
Use waist circumference and body fat % for a fuller picture

Frequently asked questions

Is BMI accurate?

Useful population screening; doesn't distinguish muscle from fat. Athletes score 'overweight'.

Healthy BMI?

WHO: normal = 18.5–24.9. Under <18.5, overweight 25–29.9, obese ≥30.