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Standard WHO / NIH classification for adults 20+
| BMI Range | Category | GLP-1 Eligible |
|---|---|---|
| Below 18.5 | Underweight | — |
| 18.5 – 24.9 | Normal Weight | — |
| 25.0 – 29.9 | Overweight | ✓ w/ conditions |
| 30.0 – 34.9 | Obese Class I | ✓ Eligible |
| 35.0 – 39.9 | Obese Class II | ✓ Eligible |
| 40.0 and above | Obese Class III | ✓ Eligible |
GLP-1 eligibility (Wegovy/Zepbound) at BMI 27–29 requires at least one weight-related condition: type 2 diabetes, hypertension, high cholesterol, or sleep apnea. BMI is a screening tool — clinical eligibility is confirmed at provider evaluation.
Quick Facts
Body Mass Index (BMI) is a simple, inexpensive, and noninvasive screening tool used to estimate whether a person has an appropriate body weight for their height. It's one of the most widely used health assessments in clinical practice worldwide.
BMI is calculated by dividing your weight in kilograms by your height in meters squared: BMI = kg / m². In imperial units, the formula is weight (lbs) × 703, divided by height in inches squared. Our calculator does this instantly for you.
BMI helps providers quickly identify patients who may be at risk for weight-related conditions such as type 2 diabetes, heart disease, high blood pressure, sleep apnea, and certain cancers. It's a starting point for a deeper conversation about health.
Research consistently shows that BMI above 25 is associated with progressively higher risk of metabolic disease. A BMI ≥ 30 significantly raises risk for type 2 diabetes, hypertension, fatty liver disease, osteoarthritis, and cardiovascular disease.
FDA-approved GLP-1 medications (Wegovy, Zepbound) are clinically indicated for adults with BMI ≥ 30, or BMI ≥ 27 with a weight-related condition. Clinical trials show 15–22% body weight loss over 18 months with proper use.
BMI is a useful population-level screening tool, but it doesn't tell the whole story. Several important factors can affect how BMI relates to your individual health.
Athletes and highly muscular individuals may have a high BMI due to muscle mass rather than excess fat. Muscle is denser than fat, so a very muscular person can have a BMI in the overweight range while having very low body fat.
Older adults may have lost muscle mass over time (sarcopenia), resulting in a "normal" BMI that underestimates body fat percentage. Body fat typically increases with age even when weight stays the same.
Ethnic differences affect how BMI relates to health risk. Some Asian populations face higher cardiometabolic risk at lower BMI values (some guidelines use a threshold of 23 rather than 25 for overweight). Your provider can advise on appropriate thresholds for you.
BMI doesn't measure fat distribution. Where body fat is stored matters. Abdominal or "central" obesity (measured by waist circumference) is more closely linked to metabolic disease than fat stored in the hips and thighs.
BMI does not apply to children and teens in the same way. For people under 20, BMI is plotted on age- and sex-specific growth charts. The adult BMI ranges used above are not appropriate for pediatric assessment.
BMI is a starting point, not a diagnosis. Always discuss your results with a qualified healthcare provider who can consider your full medical history, lifestyle, and other health markers.
BMI (Body Mass Index) is a screening tool that estimates body fat based on height and weight. It is calculated by dividing your weight in kilograms by your height in meters squared (kg/m²). BMI is widely used by healthcare providers to identify potential weight-related health risks.
The standard BMI categories are: Underweight (below 18.5), Normal weight (18.5–24.9), Overweight (25.0–29.9), Obese Class I (30.0–34.9), Obese Class II (35.0–39.9), and Severely Obese / Class III (40.0 and above). A BMI of 18.5–24.9 is generally considered healthy for most adults.
BMI is a useful population-level screening tool, but it has limitations. It does not directly measure body fat and can misclassify individuals who are very muscular (athletes may have high BMI but low body fat) or older adults who have lost muscle mass. BMI should be interpreted alongside other clinical factors. Always consult a healthcare provider for a complete health assessment.
FDA-approved GLP-1 medications like Wegovy (semaglutide) and Zepbound (tirzepatide) are indicated for adults with a BMI of 30 or higher, or adults with a BMI of 27 or higher who also have at least one weight-related condition such as type 2 diabetes, hypertension, high cholesterol, or sleep apnea.
The standard BMI scale uses the same ranges for adult men and women. However, women typically carry more body fat than men at the same BMI, and the health risks associated with BMI can differ by sex. Age and ethnicity may also affect how BMI relates to health risk. Your healthcare provider can give personalized guidance.
If your BMI is 25 or above, consider speaking with a healthcare provider. Depending on your overall health and medical history, options may include lifestyle changes (diet and exercise), FDA-approved medications for weight management, or other treatments. Icon Medicine offers same-day telehealth weight management appointments in Maryland, Virginia, and Florida — book a $99 evaluation today.
Metric: BMI = weight (kg) ÷ [height (m)]². Example: 80 kg ÷ (1.75 × 1.75) = 26.1
Imperial: BMI = [weight (lbs) ÷ height (inches)²] × 703. Example: 180 lbs ÷ (70 × 70) × 703 = 25.8
Our free calculator does this automatically — just enter your measurements above.