BMI Calculator & Body Composition
Enter your height and weight to see your BMI, ideal weight range, and body surface area. Add age and sex to unlock BMR, TDEE, and calorie targets.
Your measurements
Optional — unlocks BMR & TDEE
Saved snapshots
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Your BMI
22.9kg/m²
WHO scale
12 – 42 kg/m² window (normal starts at BMI 18.5)161718.5253035400
Severe thinnessModerate thinnessMild thinnessNormalOverweightObese class IObese class IIObese class III
Ideal weight range
56.7 – 76.3 kg
Derived from BMI 18.5 – 24.9 for your height.
To enter normal range
Inside range
You're already inside the WHO normal range.
Body surface area
1.84 m²
Mosteller formula: √(height_cm × weight_kg / 3600).
Add age and sex to unlock BMR, TDEE, and daily calorie targets.
BMI is a screening metric, not a diagnosis. It doesn't account for muscle mass, frame, or body composition. Consult a professional for medical decisions.