BMI Calculator
Your BMI is a screening number — weight in kilograms divided by height in metres squared. Enter your height and weight in either US or metric units and the calculator returns your BMI to one decimal, your WHO weight category, and, when your BMI is 27 or higher, how that maps to the BMI thresholds printed in the FDA labels for the weight-management GLP-1 drugs.
Enter your height and weight to see your BMI.
BMI is a screening number, not a diagnosis. It does not measure body composition and can misclassify very muscular or older adults. Everything is calculated in your browser; nothing is sent or stored.
What the BMI Calculator does
The BMI Calculator takes your height and weight — in US (feet/inches, pounds) or metric (centimetres, kilograms) units — and returns your body mass index to one decimal place, along with the WHO adult weight category it falls in: underweight, healthy weight, overweight, or one of three obesity classes.
When your BMI is 27 or higher, it adds a note explaining how that number maps to the BMI thresholds printed in the FDA labels for the weight-management GLP-1 drugs (Wegovy and Zepbound): 30 or higher qualifies on BMI alone, while 27 to 29.9 qualifies only alongside a weight-related condition. Everything runs in your browser; nothing you type is sent or stored.
How to read your result
Read the BMI number and its category as a screening signal, not a verdict on your health. A single figure cannot tell you about your body composition, muscle, or fat distribution — it is a quick population-level bucket.
If the tool shows a GLP-1 note, treat it as orientation only. Meeting the BMI threshold does not mean you will be prescribed a GLP-1, and a prescriber checks contraindications and your full history before deciding. The note links to our GLP-1 eligibility guide so you can see what else matters.
What the result is based on
The math is the standard BMI formula: weight in kilograms divided by height in metres squared. US inputs are converted to metric first. Categories follow the WHO adult cut-points (under 18.5, 18.5-24.9, 25-29.9, and the three obesity classes at 30, 35, and 40).
The GLP-1 note reproduces the BMI criteria from the FDA prescribing information for the weight-management drugs — 30 or higher, or 27 or higher with a weight-related comorbidity. It applies no other eligibility logic.
What it cannot tell you
- BMI does not measure body fat. It can overstate risk in very muscular people and understate it in older adults who have lost muscle.
- It says nothing about where fat is carried, which affects health risk independently of BMI.
- The GLP-1 note reflects only the label BMI threshold. It does not check the comorbidity, contraindications, age, or insurance rules that determine an actual prescription.
- It is not a diagnosis. Only a clinician can interpret your BMI in the context of your health.
Frequently asked questions
How is BMI calculated?
Weight in kilograms divided by height in metres squared. The calculator converts US units to metric before applying the formula.
What BMI qualifies for a GLP-1 like Wegovy or Zepbound?
The FDA labels set the threshold at a BMI of 30 or higher, or 27 or higher together with a weight-related condition such as high blood pressure, type 2 diabetes, or high cholesterol. A prescriber confirms eligibility.
Is BMI accurate for everyone?
No. BMI is a screening tool, not a body-fat measurement, and it can misclassify very muscular or older individuals. Use it as a starting point for a conversation with a clinician.
Is my data saved?
No. The calculation happens entirely in your browser and nothing you enter is transmitted or stored.
This tool is for education and planning. It does not diagnose, prescribe, or replace advice from a licensed clinician. Bring your result to a provider to decide what is right for you.