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BMI Calculator
Body Mass Index is a quick screening number, not a diagnosis — but it's the number your doctor's office almost always calculates first. This tool computes it the same way clinical calculators do.
Open BMI Calculator →✓ 100% free
✓ No signup
✓ Files never uploaded
How to use it
- Choose Metric (kg/cm) or Imperial (lb/ft-in) units.
- Enter your height and weight.
- Your BMI number and its category (underweight, normal, overweight, obese) appear immediately.
When it's useful
Useful before a doctor's visit so you already know your number, for tracking general trends over time, or just out of curiosity after a health kick.
FAQ
Is BMI accurate for everyone?
BMI doesn't distinguish muscle from fat, so it can be misleading for athletes or very muscular people — it's a general screening tool, not a full health assessment.
What BMI range is considered 'normal'?
For most adults, 18.5–24.9 is classified as the normal range, though this can vary slightly by population and health guideline.