BMI Calculator for Adults
Estimate adult body mass index using height and weight. Intended for people age 20 or older.
Your BMI
24.4
Healthy weightHealthy weight range for your height125–169 lb
UnderweightBelow 18.5
Healthy weight18.5 – 24.9
Overweight25.0 – 29.9
Obesity30.0 and higher
BMI is a screening measure and does not directly measure body fat or provide a complete assessment of health. Consult a qualified healthcare professional for personal advice.
Formula
Metric: BMI = weight(kg) ÷ height(m)²
U.S.: BMI = weight(lb) ÷ height(in)² × 703
Methodology & sources
Every formula on this page is verified against the authoritative publications listed below. Assumptions describe the boundaries of the estimate.
Formulas
- Metric: BMI = weight(kg) ÷ height(m)²
- US: BMI = 703 × weight(lb) ÷ height(in)²
- Categories: <18.5 underweight, 18.5–24.9 healthy, 25.0–29.9 overweight, ≥30 obesity
Assumptions
- Applies to adults age 20 and older.
- Not appropriate for athletes with high muscle mass, pregnant people, or children (use CDC growth charts).
- BMI is a screening tool, not a diagnosis of body fatness or health.
Citations
- [1]About Adult BMI — U.S. Centers for Disease Control and Prevention (CDC).Verified 2026-07-22.
- [2]Obesity: preventing and managing the global epidemic (WHO Technical Report 894) — World Health Organization.Verified 2026-07-22.
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This calculator provides estimates only. Results depend on the values entered and may not account for every individual situation. This site does not provide financial, tax, legal, investment, medical, or academic advice.