Estimate Body Mass Index (BMI) using metric (kg, cm) or imperial (lb, in) units. BMI is a screening number, not a full health diagnosis.
BMI Calculator
How to Use
- Choose metric or imperial.
- Enter weight and height.
- Calculate BMI and category.
Formula
Metric: BMI = weight(kg) / [height(m)]². Imperial: BMI = 703 × weight(lb) / [height(in)]².
Worked Example
Example: 70 kg and 170 cm → BMI ≈ 24.2 (Normal range under common adult charts).
What the Result Means
Categories (adult general): Underweight < 18.5; Normal 18.5–24.9; Overweight 25–29.9; Obese ≥ 30. Individual health needs clinical context.
Important Notes & Limitations
- Not for children, athletes with high muscle mass, or medical diagnosis.
- Talk to a healthcare professional about your health.
Frequently Asked Questions
Is BMI accurate for everyone?
No. Muscle, age, and body composition affect interpretation.
Which units should I use?
Whichever you measure in—metric or imperial.
Is this medical advice?
No. Educational use only.
Why do categories differ?
Some organizations use slightly different cutoffs; we use common adult ranges.
Related Calculators
See also: Date Calculator, Age Calculator, Time Calculator.
Disclaimer: Results are approximate and for educational and informational purposes only. They are not financial, tax, medical, or legal advice. Verify important decisions with a qualified professional.