BMI Calculator
Calculate Body Mass Index using metric or imperial units.
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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.
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.
Looking for broader guides and best practices? Visit the ToolsAreUs Blog for indexes (like the full tool list) and articles (e.g. secure password generation).