BMI Calculator

Check your Body Mass Index and understand what your number means for your health. Your BMI (body mass index) is one tool used to screen for weight-related risks and eligibility for GLP-1 medications. Enter your height and weight to calculate your BMI instantly.

0.0

YOUR BMI

Underweight

< 18.5

Healthy weight

18.5 - 24.9

Overweight

25.0 - 29.9

Obesity

> 30

What is BMI?

Body Mass Index (BMI) is a simple calculation that compares your weight to your height. It gives a general estimate of body fat and helps identify whether your weight falls within a range linked to increased health risks.

BMI is not a perfect measure, but it can be useful for assessing:

risk of conditions like type 2 diabetes, high blood pressure, or heart disease
how weight may be affecting your metabolism
eligibility for treatments such as semaglutide or tirzepatide

BMI is one part of a bigger picture, and it is best interpreted alongside other indicators including blood sugar, waist circumference, and overall metabolic health.

How BMI is Calculated

BMI uses a straightforward formula:

BMI = weight (kg) ÷ height² (m²)

If you enter your information in pounds and feet/inches, the calculator automatically converts your measurements.
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BMI Categories

Healthcare guidelines classify BMI into the ranges below:

‍Underweight: below 18.5
Normal: 18.5–24.9
Overweight: 25–29.9
Obesity (Class 1): 30–34.9
Obesity (Class 2): 35–39.9
Obesity (Class 3): 40 or higher

These categories help evaluate potential weight-related health concerns, but they do not diagnose a condition on their own.

How Accurate is BMI?

BMI is widely used because it is quick, inexpensive, and reliable at the population level. Still, it has limitations. BMI does not measure:

muscle mass
bone structure
body fat distribution
metabolic health
hormonal factors

For example, athletes may have a high BMI due to muscle, not excess body fat. Meanwhile, some people with a “normal” BMI may still have metabolic risks if they carry excess visceral fat or have insulin resistance.

A BMI result is most helpful when combined with:

blood tests
waist-to-hip ratio
medical history
lifestyle patterns
body composition analysis (if available)

BMI and GLP-1 Medication Eligibility

Many GLP-1 medications follow FDA-approved BMI guidelines for weight-loss treatment.

You may qualify for GLP-1 therapy if:

BMI is 30 or higher, or
BMI is 27 or higher with a weight-related health condition such as
- high blood pressure
- high cholesterol
- insulin resistance
- prediabetes
- obstructive sleep apnea
- type 2 diabetes

BMI is one factor, clinicians also evaluate blood sugar patterns, appetite behaviors, medical history, and overall health goals.

Why BMI Still Matters in 2025

Although newer tools like body composition scans and metabolic tests offer deeper insights, BMI remains useful because:

it helps track trends over time
it correlates with long-term disease risk
it provides a consistent baseline for medical guidelines
many insurance providers still use BMI thresholds for GLP-1 coverage

Think of BMI as a starting point, not a complete picture.

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