Normal
56.7–76.3 kg
A BMI calculator estimates your Body Mass Index (BMI) using your height and weight to screen for healthy weight ranges. Healthcare professionals, the Centers for Disease Control and Prevention, and the American Society for Metabolic and Bariatric Surgery use BMI as a practical assessment tool. It also helps interpret BMI Prime, obesity risk, and weight management goals for adults.
Our BMI calculator instantly calculates your Body Mass Index (BMI), weight category, and healthy weight range using your height and weight.
Enter your height and weight in Metric or Imperial units.
Choose Metric or Imperial based on your preferred measurement system.
Instantly view and copy your BMI, weight category, and healthy weight range
Enter your height and weight in Metric or Imperial units.
Choose Metric or Imperial based on your preferred measurement system.
Instantly view and copy your BMI, weight category, and healthy weight range
[Instruction: Add the main page content using Markdown or rich text with headings and paragraphs.] Calculate BMI by dividing your weight by the square of your height. The result helps estimate whether your weight falls within a healthy range. Healthcare professionals commonly use this screening method alongside BMI Prime, body composition, and other clinical assessments.
Metric:
US:
A person weighs 70 kg and is 1.75 m tall.
A BMI of 22.9 falls within the Healthy Weight category.
BMI categories help identify whether your weight is appropriate for your height. They support health screening but should be interpreted alongside body composition, age, sex, and medical evaluation.
A BMI below 18.5 is considered underweight. Healthcare professionals may assess nutritional status, muscle mass, underlying medical conditions, and growth patterns before recommending dietary or medical interventions.
A BMI between 18.5 and 24.9 generally indicates a healthy weight. Maintaining balanced nutrition, regular physical activity, and healthy lifestyle habits supports long-term cardiovascular and metabolic health.
A BMI between 25.0 and 29.9 is classified as overweight. Doctors may recommend gradual weight management through improved nutrition, increased activity, and regular health monitoring to reduce disease risk.
A BMI of 30 or higher indicates obesity. Medical evaluation may include obesity-related conditions, bariatric surgery eligibility, metabolic health, waist circumference, and personalized treatment planning.
BMI | Category |
|---|---|
Below 18.5 | Underweight |
18.5–24.9 | Healthy Weight |
25.0–29.9 | Overweight |
30.0–34.9 | Obesity Class I |
35.0–39.9 | Obesity Class II |
40.0 and above | Obesity Class III |
BMI-for-Age Percentile | Weight Category |
|---|---|
Below 5th percentile | Underweight |
5th to below 85th percentile | Healthy Weight |
85th to below 95th percentile | Overweight |
95th percentile or above | Obesity |
The Ponderal Index measures body leanness similarly to BMI but uses height cubed instead of height squared. It is sometimes more appropriate for very tall or very short individuals and newborn assessments, although BMI remains the most widely used screening tool.
BMI provides a useful screening value, but age, sex, muscle mass, pregnancy, and ethnicity influence how accurately it reflects body fat and overall health.
Body composition changes with age. Older adults often lose muscle mass while body fat increases, meaning identical BMI values can represent different health profiles.
Men and women naturally differ in fat distribution and lean body mass. These physiological differences influence how BMI relates to actual body fat percentage.
Athletes and individuals with high muscle mass may have elevated BMI despite having low body fat. Additional measurements provide a more complete health assessment.
BMI should not assess healthy weight during pregnancy. Healthcare professionals use pregnancy-specific weight gain guidelines instead of standard BMI classifications.
Different ethnic populations may experience varying health risks at the same BMI. Healthcare providers may interpret BMI alongside population-specific clinical guidance.
Being overweight increases the risk of obesity, type 2 diabetes, cardiovascular disease, hypertension, and sleep apnea. Being underweight may contribute to malnutrition, weakened immunity, osteoporosis, reduced muscle strength, and fertility concerns.
Limitations of BMI
BMI estimates weight status but does not directly measure body fat, muscle mass, bone density, or fat distribution. Healthcare professionals often combine BMI with waist circumference, medical history, and additional clinical assessments.
Our BMI calculator provides educational information only and should not replace professional medical advice, diagnosis, or treatment. Consult a qualified healthcare professional for personalized recommendations, especially regarding obesity, bariatric surgery, or chronic health conditions.
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