Adults, ages 20 and over
Adult BMI calculator
See where your body mass index sits, the weight range that matches your height and, if you like, what your waist adds to the picture. Made for women and men, in pounds or kilograms.
Please read first
BMI is a screening number, not a diagnosis. It does not measure body fat, muscle or bone, or where your body carries weight, so it can read differently for athletes, older adults, pregnancy and many body types.
This tool is for adults, ages 20 and over. For ages 2 to 19, BMI is read against growth charts that use age and sex, so please use the CDC child and teen calculator below or ask your provider. It is not medical advice: please talk with your provider or our team about what your numbers mean for you.
Everything stays on this page. What you type is not saved and is not sent anywhere.
Your BMI
Enter your height and weight to see your BMI.
BMI is only part of the picture
BMI uses just two numbers, your height and your weight. It cannot tell muscle from fat or show where your body carries weight.
Our body composition analyzer can estimate body fat, muscle, skeletal muscle, body water, protein, minerals and bone mass. These are estimates, not a diagnosis. Your provider goes through them with you, together with your goals and health history.
- Body fat
- Muscle
- Skeletal muscle
- Body water
- Protein
- Minerals
- Bone mass
Curious about a fuller picture? A weight loss evaluation is a good place to start. Mention that you would like to know more about your body composition and ask our team how it fits into your visit.
Weight Loss Evaluation and Consultation
60 min · $80.00
A personal conversation about your goals, your health history and your next steps.
View availabilityPersonalized Nutrition Coaching
45 min · $150.00
Meal plans, habits and steady support from our certified nutrition coach.
View availabilityWhat is BMI?
Body mass index (BMI) is a number that compares your weight with your height. Health professionals use it as a quick screening tool: a starting point for a conversation, not a verdict on your health.
How BMI is calculated
BMI is your weight in kilograms divided by your height in meters, squared. In pounds and inches the same idea is 703 × pounds ÷ inches². The formula uses only height and weight: it does not use your age or sex.
BMI = kg ÷ m² (or 703 × lb ÷ in²)
Adult BMI ranges
For adults 20 and over, the same ranges apply to women and men at every age. These are the names the CDC uses for each range. They describe a number, not a person.
| BMI | CDC name |
|---|---|
| Under 18.5 | Underweight |
| 18.5 to 24.9 | Healthy weight |
| 25 to 29.9 | Overweight |
| 30 to 34.9 | Obesity, class 1 |
| 35 to 39.9 | Obesity, class 2 |
| 40 or more | Obesity, class 3 (severe) |
Does age or sex change adult BMI?
No. For adults 20 and over, BMI is worked out from height and weight alone, and the ranges are the same for women and men at every age. That is why this calculator does not ask for your age. Age and sex matter for children and teens (ages 2 to 19), whose BMI is compared with growth charts. Women and men do tend to carry weight differently, which is why the optional waist guidance has a line for each.
What BMI does not tell you
It cannot tell muscle from fat, it ignores where weight is carried, and it can read differently across body types, backgrounds and life stages such as pregnancy. That is why we pair it with a conversation.
When it can help to talk with a professional
There is no single number that means you must act. It can help to talk with a provider if:
- your BMI is outside the healthy range and you would like to understand what it means for you
- you have a health condition, take medication, or have a family history that worries you
- your weight has changed and you are not sure why
- you would like a plan that fits your life and your goals
Where these numbers come from
Frequently asked questions
Want to talk it through?
Our providers can look at the whole picture with you and shape a plan that fits your life. View availability or call us at (656) 262-3529.