BMI Calculator
Medical context
Calculate body mass index from metric or imperial measurements with WHO category labels.
Primary and hospital medicine teams use this for everyday internal medicine workflows.
This page explains the BMI formula, how to interpret the output, known limitations, and peer-reviewed references so you can verify results against primary sources and local protocols.
It is grouped under General Medicine because everyday internal medicine calculators.
How to use this calculator
- Enter the values requested by the BMI calculator using the units shown beside each field.
- Review the calculated result and read the interpretation section before acting on the output.
- Check limitations and references if the result will change management, dosing, or disposition.
- Use the related calculators section when you need supporting values (for example electrolytes, weight, or complementary risk scores).
Calculator
Result
24.2
Healthy weight
Educational use only. Confirm results with clinical judgment, primary sources, and local protocols. Not a substitute for professional medical advice. Full disclaimer.
Formula
BMI = kg / m² (metric) or 703 × lb / in² (imperial).
Interpretation
WHO adult categories: <18.5 underweight, 18.5–24.9 healthy, 25–29.9 overweight, ≥30 obesity.
Limitations
BMI does not distinguish fat vs muscle and thresholds differ for children and some populations.
Frequently asked questions
- Is BMI diagnostic of health?
- No. It is a screening anthropometric index and must be interpreted clinically.
- Is the BMI result enough to make a treatment decision?
- No. Calculators support medical decision-making but do not replace examination, shared decision-making, institutional protocols, or consultant input when stakes are high.
- Does Calcmedical store the values I type in?
- Inputs are processed in your browser for this session. We do not ask for patient names or medical record numbers. See our privacy policy for hosting and analytics details.
References
- WHO BMI classification