BMI Calculator
Enter your height and weight in metric or imperial units to instantly calculate your Body Mass Index and weight category.
23.5
Healthy weight
BMI ranges: Underweight <18.5 · Healthy 18.5–24.9 · Overweight 25–29.9 · Obesity ≥30
Frequently Asked Questions
How is BMI calculated?
Metric: weight (kg) ÷ height (m)². Imperial: 703 × weight (lb) ÷ height (in)². Both formulas are mathematically equivalent, just scaled for the unit system.
Is BMI an accurate measure of health?
BMI is a quick screening tool, not a diagnosis — it doesn't distinguish muscle from fat, so athletes and very muscular people can show a high BMI despite low body fat. Consult a healthcare provider for a full assessment.
What are the standard BMI categories?
Underweight: below 18.5. Healthy weight: 18.5–24.9. Overweight: 25–29.9. Obesity: 30 and above. These are the WHO/CDC adult reference ranges.
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