Calculate your BMI in seconds.
Your body mass index is one quick way to see whether you may be a candidate for prescription weight loss medications like Wegovy, Zepbound, or compounded semaglutide.
What BMI means — and what it doesn’t
Body mass index is a simple ratio of weight to height. It’s used by clinicians as a starting point because it’s fast and inexpensive, but it doesn’t account for muscle mass, bone density, or where your body stores fat. Two people with the same BMI can have very different metabolic health.
How clinicians actually use BMI
For weight loss prescriptions, most providers follow these general thresholds (per FDA labeling for GLP-1 medications):
- BMI of 30 or higher (obesity)
- BMI of 27 or higher with at least one weight-related health condition such as high blood pressure, type 2 diabetes, high cholesterol, or sleep apnea
Your clinician will combine BMI with lab work, medical history, and lifestyle context before deciding whether semaglutide, tirzepatide, or another medication is appropriate.
Limitations to keep in mind
BMI tends to overestimate fat in muscular people and underestimate it in older adults who have lost muscle. Waist circumference, body composition scans, and metabolic labs paint a more complete picture.
Frequently asked questions
What is a healthy BMI range?
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The widely used clinical range for healthy adult BMI is 18.5 to 24.9. Below 18.5 is considered underweight, 25 to 29.9 is overweight, and 30 and above is classified as obesity. These ranges do not apply directly to children, pregnant women, or highly athletic individuals.
What BMI qualifies me for semaglutide or tirzepatide?
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Most clinicians follow the FDA labeling for Wegovy and Zepbound, which is a BMI of 30 or higher, or 27 or higher with at least one weight-related condition. Your clinician makes the final call after reviewing your full health history.
Is BMI accurate for everyone?
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No. BMI is a screening tool, not a diagnosis. It does not distinguish muscle from fat and does not factor in age, sex, or where fat is distributed. Use it alongside other metrics like waist circumference and blood work.
How is BMI calculated?
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BMI equals weight in kilograms divided by height in meters squared. In imperial units, the formula is (weight in pounds × 703) divided by height in inches squared. Our calculator handles both for you.
Does insurance use BMI to approve GLP-1 medication?
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Many insurance plans use BMI thresholds as part of their prior-authorization criteria for medications like Wegovy and Zepbound. Specific requirements vary by insurer and plan year.
Got your number? Let’s see what’s next.
Whether your BMI is borderline or clearly above the threshold, a licensed clinician can walk you through what’s realistic and what isn’t.
Your first consultation is free
Meet a licensed U.S. clinician at no cost. No insurance required and no hidden fees — you only pay if you and your clinician decide treatment is right for you.