Calculator

BMI Calculator

Calculate your Body Mass Index, see your BMI category, and learn whether your BMI meets FDA labeling criteria for GLP-1 weight-loss medications like Wegovy and Zepbound.

Your measurements

Unit system

Height (ft)

Height (in)

Weight (lb)

Do you have a weight-related comorbidity?

Comorbidities affect GLP-1 eligibility at lower BMI thresholds (FDA labels).

Your result

BMI: 30.1

Category: Obese Class I

BMI Value

30.1

BMI Categories & GLP-1 Thresholds

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

Obese Class III 40.0 and above

Wegovy / Zepbound threshold BMI ≥ 30 (or ≥ 27 + comorbidity)

Educational tool only. Not medical advice. Consult your prescriber before making decisions about medications, calorie targets, or weight goals. BMI has well-known limitations: it does not account for muscle mass, bone density, age, sex, or ethnicity. Athletes and older adults may be misclassified. Your prescriber will consider your full clinical picture.

How BMI is calculated

BMI (Body Mass Index) is calculated as weight in kilograms divided by height in meters squared:

BMI = weight (kg) / height (m)²

In imperial units: BMI = (weight in pounds × 703) / (height in inches)²

BMI was developed by Adolphe Quetelet in the 19th century as a population-level statistical tool, not a diagnostic instrument. Despite its widespread use, it has significant limitations at the individual level.

FDA GLP-1 BMI eligibility criteria

Per FDA approved labeling for Wegovy (semaglutide 2.4 mg) and Zepbound (tirzepatide), indications include:

BMI ≥ 30 kg/m² (obesity) — no comorbidity required
BMI ≥ 27 kg/m² with at least one weight-related comorbidity (e.g., hypertension, type 2 diabetes, dyslipidemia, obstructive sleep apnea)

Ozempic and Mounjaro are FDA-approved for type 2 diabetes and may produce weight loss as a secondary benefit. Prescribers have clinical discretion and may consider off-label use. BMI alone does not determine prescription decisions.

BMI limitations

Muscle mass: Athletes and muscular individuals may have a high BMI without excess fat.
Age: Older adults may have more body fat at a given BMI than younger adults.
Ethnicity: Asian populations tend to have higher metabolic risk at lower BMI thresholds (some guidelines use BMI ≥ 25 as the obesity threshold for Asian populations).
Fat distribution: BMI does not distinguish between visceral (abdominal) and subcutaneous fat, which have different metabolic risk profiles.
Sex: Women typically have more body fat than men at the same BMI.

Your measurements

BMI: 30.1

BMI Categories & GLP-1 Thresholds

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