Health
BMI Calculator
Calculate BMI from height and weight, see your BMI category, and estimate a standard healthy weight range.
Last updated July 9, 2026
About This Tool
Use this BMI calculator to estimate body mass index with either metric or imperial units. BMI is a simple screening measure based on height and weight, useful for broad adult weight categories but not a full health diagnosis.
BMI Formula
BMI = weight(kg) / height(m)^2For imperial units, BMI is calculated as 703 x weight(lb) / height(in)^2. The healthy weight range uses the standard adult BMI range of 18.5 to 24.9.
How To Interpret BMI
For adults, BMI is commonly grouped into underweight, healthy weight, overweight, and obesity categories. These categories are screening ranges, not a complete assessment of health.
BMI does not measure body fat directly. Muscle mass, pregnancy, age, body composition, and individual health markers can make BMI less useful for some people.
Useful Next Checks
If your BMI is outside the healthy-weight range, consider it a prompt for context rather than a verdict. Waist measurement, blood pressure, cholesterol, blood sugar, activity level, and medical history can all matter.
For children and teens, adult BMI categories should not be used. Pediatric BMI is interpreted by age-and-sex percentiles.
Examples
Metric BMI
Height: 175 cm, Weight: 72 kg
Result: BMI around 23.5, in the normal range.
Imperial BMI
Height: 69 in, Weight: 160 lb
Result: BMI around 23.6, in the normal range.
FAQ
Is BMI accurate for everyone?
BMI is a screening tool, not a diagnosis. It may be less informative for athletes, older adults, children, pregnant people, and people with unusually high or low muscle mass.
What BMI range is considered normal?
For most adults, a BMI from 18.5 to 24.9 is commonly categorized as normal or healthy weight.
Does this calculator store health data?
No. The calculation runs in your browser and does not require an account.
References
Important Note
Health calculators are general screening and education tools. They are not a diagnosis or medical advice. Speak with a qualified clinician for personal health decisions.