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Use this free adult BMI calculator to estimate your body mass index, understand the standard BMI categories, and learn how to interpret the result in context. Calculate BMI using U.S. measurements (feet, inches, and pounds) or metric measurements (centimeters and kilograms). Your result includes the standard adult BMI category and a reference weight range for your height.
For adults age 20 and older.
Enter your height and weight to see your result and the standard adult BMI category it falls within.
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Body mass index compares your weight with your height to place the result within a standard adult weight category. It is widely used as a screening tool because it is quick and consistent—not because it captures every part of health.
BMI is calculated as weight in kilograms divided by height in meters squared. For U.S. measurements, the equivalent equation uses pounds, inches, and a conversion factor of 703.
The result helps organize adults into reference categories that may prompt a closer look at weight-related risks, trends, and other health information.
BMI does not explain body composition, where fat is stored, fitness, blood pressure, laboratory results, symptoms, or the factors influencing your weight.
BMI is calculated from height and weight. Use the metric formula for kilograms and meters or the U.S. formula for pounds and inches. This calculator uses either system and rounds your BMI score to one decimal place.
With metric measurements, divide kilograms by meters squared. With U.S. measurements, divide pounds by inches squared and multiply by 703.
At 5 feet 10 inches and 185 pounds, the calculated BMI is 26.5, which falls within the standard overweight range.
The same standard adult formula and category cutoffs are used for men and women age 20 and older. Body composition, pregnancy, age, race or ethnicity, and individual health history may still affect how a result should be interpreted.
This example is educational and is not a diagnosis or personalized health recommendation.
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BMI is a fast screening estimate based on height and weight. It can be useful for identifying questions worth exploring, but it cannot directly measure body composition, metabolic health, fitness, or how weight is affecting an individual.
BMI places weight relative to height into standard adult categories. Clinicians may consider it alongside waist measurement, vital signs, laboratory results, medical history, and symptoms.
BMI cannot distinguish fat from muscle, bone, or fluid. Two people with the same BMI may have very different body composition and health profiles.
Your result cannot diagnose a condition or determine whether medication or treatment is appropriate. Those decisions require an individualized clinical evaluation.
BMI uses only height and weight. These are major factors it does not directly measure—and why two people with the same result can have very different health profiles.
A BMI category is a population-based screening range—not a prediction or diagnosis. Its practical value is identifying the health history, symptoms, measurements, and laboratory markers that may deserve a closer look.
This may reflect a person’s natural build, but an unexpectedly low BMI or continued weight loss can signal that more context is needed.
This range is generally associated with lower weight-related risk at the population level, but it does not guarantee metabolic health or an appropriate body composition.
This result can reflect greater body fat, greater muscle mass, or both. Health implications vary substantially with fat distribution and other risk factors.
At a population level, this range is associated with a higher likelihood of metabolic and weight-related conditions, but the BMI result does not diagnose them.
Associations with weight-related complications generally become stronger as BMI increases, particularly when several risk factors are already present.
This range carries the strongest population-level association with serious weight-related complications, making comprehensive evaluation especially valuable.
Reference chart, not a diagnosis: These are standard adult screening categories. The conditions listed are examples of health history a clinician may consider; the category does not confirm that any condition is present or determine treatment eligibility.
Treat the category as a starting point—not a verdict. Its value increases when it is considered alongside changes over time and the health information BMI cannot capture.
Body mass index compares weight with height. The metric equation divides weight in kilograms by height in meters squared. The U.S. equation divides weight in pounds by height in inches squared and multiplies the result by 703.
The standard healthy-weight BMI range—sometimes called the normal BMI range—is 18.5–24.9 for adults age 20 and older. It is a population-based reference range—not a personalized goal or guarantee of health.
BMI offers a quick, consistent way to screen weight relative to height. A result outside the reference range may prompt a closer look at waist measurement, blood pressure, laboratory markers, symptoms, habits, and health history.
No. BMI does not directly measure body fat or distinguish how much weight comes from muscle, bone, water, or fat. Two people with the same BMI can have very different body composition.
Yes. Because BMI counts all weight the same, greater muscle mass can produce a higher result even when body fat is relatively low. Body composition and other health markers provide important context.
For adults age 20 and older, the same standard BMI formula and category cutoffs are generally used for men and women. BMI does not adjust for sex, age, race or ethnicity, pregnancy, or muscle mass, so interpretation may differ. Children and teens need age- and sex-specific growth charts.
Not by itself. BMI may be one part of an evaluation, but treatment eligibility and safety depend on health history, current conditions, medications, relevant laboratory information, goals, and a clinician’s assessment.
This calculator is intended for adults age 20 and older. Children and teens use age- and sex-specific growth charts. Pregnancy, high muscularity, older age, and certain medical conditions may also make an adult BMI result less representative.
BMI does not measure fat distribution, blood pressure, blood sugar, cholesterol, fitness, strength, sleep, nutrition, symptoms, or personal and family history. It should be interpreted with other relevant information.
There is usually little value in checking it daily. If you are tracking longer-term change, measure under reasonably consistent conditions and focus on the trend rather than small day-to-day fluctuations.
The calculator uses the standard adult BMI equation and category cutoffs for adults age 20 and older. BMI is a screening measure and should be interpreted alongside other individual health factors. Last updated September 2026.
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This calculator and page are for general educational purposes only and are not medical advice, diagnosis, or a substitute for professional care. BMI is a screening measure and does not determine treatment eligibility. Services and prescriptions, when appropriate, require evaluation by a licensed clinician. Results and treatment options vary.
