BMI Calculator

Use metric units (kg and metres) or imperial units (lb and inches). The formula is the same relationship; imperial includes the 703 scaling factor.

Example: 70 kg and 1.75 m → 70 ÷ (1.75 × 1.75) = 22.9. The same person at 1.60 m would have BMI 27.3 (overweight range).

Underweight: BMI below 18.5. Normal: 18.5–24.9. Overweight: 25–29.9. Obese: 30 and above. Some guidelines add severe obesity tiers above 35 and 40.

The calculator also shows a healthy weight range for your height—the band where BMI stays between 18.5 and 24.9.

BMI does not measure body fat percentage, bone density, or muscle mass. Athletes, older adults who lost muscle, and certain ethnic groups may need additional metrics.

Use BMI as a screening step, not a diagnosis. Consult a healthcare provider for personalized advice, especially if you are pregnant, under 18, or managing chronic conditions.