BMI Calculator

Check if you are in a healthy weight range.

Formula & Methodology

BMI = weight (kg) / height (m)², or 703 × weight (lb) / height (in)².

Worked Example

A 5'9" person weighing 160 lb has a BMI of about 23.6, in the normal range.

Frequently Asked Questions

What do the BMI categories mean?

Under 18.5 is underweight, 18.5–24.9 is normal, 25–29.9 is overweight, and 30+ is obese. BMI is a screening tool, not a diagnosis.

Is BMI accurate for athletes?

BMI does not distinguish muscle from fat, so very muscular people may read as overweight despite low body fat. Use body composition for a clearer picture.

Is BMI medical advice?

No. BMI is a population-level screening metric. Consult a healthcare provider for individual assessment.

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