BMI Calculator
Calculate your body mass index and understand the result category.
BMI details
Enter height and weight. Age and sex are optional context only.
Example: 175 cm
Example: 70 kg
BMI is a screening measure, not a diagnosis. Adult BMI ranges may not apply to children, pregnancy, athletes, or people with specific medical conditions.
BMI screening summary
Metric units
BMI score
22.9
Body Mass Index from your height and weight.
BMI category
Healthy weight
Common adult screening category, not a diagnosis.
Healthy BMI range
18.5 to 24.9
Common adult healthy weight BMI range.
Healthy weight range
56.7 kg to 76.3 kg
Approximate range for the entered height.
Height
175 cm
Converted automatically when switching units.
Weight
70 kg
Current weight used in the BMI formula.
Export
Save or share this BMI result
Copy the summary, copy the formula, download a CSV, or print a compact result.
Health context
Uses the standard adult BMI formula. BMI is useful for broad screening, but it does not directly measure body fat or replace professional medical advice.
Interpretation
What this BMI result means
Current category
Your BMI is 22.9, which is commonly classified as healthy weight for adults.
Height-based range
For your height, the common adult healthy BMI range corresponds roughly to 56.7 kg to 76.3 kg. Your entered weight is within the common adult healthy BMI range for this height.
What BMI leaves out
BMI does not account for muscle mass, body composition, age, ethnicity, pregnancy, or medical history.
Use health context
Consider professional advice if you have health concerns, unexplained weight change, pregnancy, or a medical condition.
Ranges
Adult BMI category ranges
Underweight
Below 18.5
Healthy weight
18.5 to 24.9
Overweight
25 to 29.9
Obesity
30 or higher
Formula
BMI formula explanation
Example using your inputs: 70 ÷ 1.75² = 22.9. Height is squared because BMI compares weight against body size rather than height alone.
Metric BMI
BMI = weight in kg ÷ height in meters²Metric uses kilograms and meters.
Imperial BMI
BMI = 703 × weight in pounds ÷ height in inches²Imperial uses pounds and total inches with the 703 conversion factor.
BMI basics
How to understand BMI
Body Mass Index
BMI compares body weight with height and returns a single screening number.
Adult categories
The categories help group results, but they are not medical diagnoses.
Height matters
Taller and shorter bodies are compared by squaring height in the formula.
Clinical context
A clinician may consider waist size, body composition, history, and other measures.
Limitations
Limitations of BMI
BMI is useful, but it should not be treated as a complete health assessment.
Muscle mass
A muscular build can raise BMI without indicating higher body fat.
Body composition
BMI does not show fat percentage, lean mass, or fat distribution.
Personal context
Age, sex, ethnicity, pregnancy, and medical history can matter.
Clinical limits
BMI should not replace medical advice or a full health assessment.
Next steps
Healthy next steps
Use multiple signals
Review BMI alongside waist measurement, fitness, sleep, diet, medical history, and how you feel.
Sustainable habits
Focus on steady, realistic habits rather than treating one number as a complete health picture.
Ask a professional
Seek professional advice for unexplained weight change or before major diet or exercise changes.
Trust
About this BMI estimate
Formula based
Uses the standard adult BMI formulas for metric and imperial units.
Private by design
Inputs are calculated in the browser. Do not enter sensitive personal information you do not want to use here.
Screening only
BMI categories are broad reference ranges and are not a diagnosis or treatment recommendation.
FAQ