BMI Calculator
For adults age 20+. Get a quick read on your weight in relation to your height.
What is BMI?
Body mass index (BMI) is a simple number calculated from your height and weight. It gives a quick estimate of how your weight compares to ranges that research has linked with different health outcomes in adults.
BMI is widely used as a first-look screening measure because it is fast and free — no equipment beyond a scale. It does not measure body fat directly and it cannot tell muscle from fat, so two people with the same BMI can have very different builds.
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Enter your height and weight and we’ll show you what a healthy target range looks like for you.
BMI Range
BMI scale: Underweight < 18.5; Healthy weight 18.5 – 24.9; Overweight 25 – 29.9; Obesity 30+.
Underweight
< 18.5
Healthy weight
18.5 – 24.9
Overweight
25 – 29.9
Obesity
30+
BMI is a screening tool
BMI is a screening measure, not a diagnosis. It does not directly measure body fat and cannot distinguish how much of your weight comes from muscle, fat, or bone.
Pregnancy guidance
Standard BMI categories should not be used to interpret weight gained during pregnancy. Pre-pregnancy weight is used to determine pre-pregnancy BMI.
What this means
BMI categories provide a general idea of your weight relative to height and can help guide health conversations.
Healthy Habits
Move more
Aim for about 150 minutes of activity each week.
Nourish your body
Choose whole foods, fruits, vegetables, and lean protein.
Sleep well
Aim for 7–9 hours of quality sleep each night.
Manage stress
Small daily habits can make a big difference.
For adults age 20+. Results are for general informational purposes only and are not a substitute for professional medical advice, diagnosis, or treatment.
