BMI Calculator
Body Mass Index with WHO classification.
Your BMI
22.9
- Classification
- Normal weight
- Range
- 18.5 – 24.9
- Healthy weight range
- 56.7 – 76.3 kg
How it works
BMI (Body Mass Index) is an international measure used to screen whether an adult's weight is appropriate for their height. It's a useful first indicator, not a substitute for medical evaluation.
Formula:
BMI = weight (kg) / height² (m)
WHO classification:
- < 18.5 — Underweight
- 18.5 to 24.9 — Normal
- 25.0 to 29.9 — Overweight
- 30.0 to 34.9 — Obesity class I
- 35.0 to 39.9 — Obesity class II
- ≥ 40 — Obesity class III
Practical examples
70 kg and 1.75 m
BMI = 70 / (1.75)² = 22.86 → Normal.
90 kg and 1.70 m
BMI = 90 / (1.70)² = 31.14 → Obesity class I.
55 kg and 1.65 m
BMI = 55 / (1.65)² = 20.20 → Normal.
Frequently asked questions
Does BMI apply to everyone?
For healthy adults it's a good first screen. Not reliable for athletes with high muscle mass, pregnant people, the elderly or children.
Does a high BMI mean I'm unhealthy?
Not necessarily. Body composition, fat distribution and clinical exams define real health risk.
BMI vs body fat %?
BMI doesn't distinguish muscle from fat. Body fat percentage measures adipose tissue directly.
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⚠️ Disclaimer
This calculator is for educational and informational purposes only. Results are estimates based on public formulas and may contain inaccuracies or be outdated. We are not accountants, lawyers, doctors, or financial advisors — for any important decision (tax filings, contracts, diagnoses, financial planning), always consult a qualified professional. calculadora.work assumes no liability for decisions made based on the content of this site.