⚖️ BMI Calculator

Calculate Body Mass Index using metric or imperial units.

Calculate

Height (cm) Weight (kg)

Height (in) Weight (lb)

Not medical advice. Consult a professional for health concerns.

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How it works

How it works

Metric formula: BMI = weight(kg) / height(m)^2. Example: 75 kg / (1.80 m)^2 ≈ 23.15.
Imperial shortcut: BMI = (weight(lb) × 703) / height(in)^2. The 703 factor converts lb/in to kg/m.
Typical categories: <18.5 Underweight, 18.5–24.9 Normal, 25.0–29.9 Overweight, ≥30 Obese.
Rounding: This tool shows two decimals; medical tools may use different precision.
Context: BMI is a rough screening metric; body composition, age, and sex are not accounted for.

Privacy & Security

All calculations local.

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Accuracy, Limits & Tips

BMI is a screening metric; it doesn’t account for muscle mass.

Examples

Height 180 cm, weight 75 kg → ~23.15
70 in, 165 lb → similar result.

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