We use cookies to keep you signed in. Cookie policy
We use cookies
CalculatorAI uses cookies to keep you signed in and remember your preferences. Optional cookies help us understand how the site is used. Cookie policy
Body Mass Index & Healthy Weight Range
BMI
Classification: Normal weight
Adult BMI Scale
Drop in a screenshot from your workout app, smart scale or fitness tracker — the AI reads it and fills these fields for you.
Habit Tracker is where this stops being a one-off number: log the routine there and watch your streak and progress build.
This BMI calculator follows adult category thresholds published by the CDC and explained by NIH/NHLBI. Use the number to frame a health conversation, then add waist measurements, body composition, medical history, and clinical context.
The visible categories are adult thresholds. CDC says adults 20 and older can use the adult BMI calculator, while ages 2–19 need the child and teen percentile tool.
The healthy range uses 18.5–24.9, then converts that BMI band into a weight range for your height. It is a reference band, not a prescription.
High muscle mass, pregnancy, older age, edema, or medical conditions can distort BMI. CDC explicitly describes BMI as a screening measure rather than a diagnostic test.
BMI is useful because it is fast and standardized; it becomes risky when treated as a complete picture of health.