BMI Calculator
Calculate your Body Mass Index to understand your weight status and potential health risks
Calculate Your BMI
Your BMI Results
About Your BMI
Complete the form to get your personalized BMI analysis.
Key Features
Discover why our BMI Calculator stands out from the rest
Accurate Calculation
Uses the standard BMI formula for precise weight status estimation
Multiple Measurements
Considers weight and height measurements for comprehensive analysis
Gender Specific
Different interpretations for men and women based on physiological differences
Visual Results
See your BMI on a color-coded scale with clear categories
Mobile Friendly
Works perfectly on all devices from desktop to mobile
Privacy First
Your data never leaves your browser - complete privacy
BMI Categories
Understand what your BMI means for your health
Underweight
May indicate malnutrition, eating disorders, or other health problems. Consultation with a healthcare provider is recommended.
Normal Weight
Associated with the lowest risk of health problems. Maintain this range through balanced diet and regular exercise.
Overweight
May increase risk of certain health conditions. Consider lifestyle modifications to prevent further weight gain.
Obese
Associated with increased health risks including heart disease, diabetes, and certain cancers. Consultation with a healthcare provider is recommended.
How to Use This Calculator
Follow these simple steps to calculate your BMI
Select Your Gender
Choose male or female as BMI interpretations differ slightly by gender.
Enter Your Age
Input your current age as BMI interpretation varies across different age groups.
Measure Your Weight
Use a scale to measure your weight in kilograms (or pounds if preferred).
Measure Your Height
Stand straight against a wall to measure your height in centimeters (or inches).
Frequently Asked Questions
Find answers to common questions about Body Mass Index
BMI (Body Mass Index) is a measure of body fat based on height and weight that applies to adult men and women. It provides a simple numeric measure of a person's thickness or thinness, allowing health professionals to discuss weight problems more objectively with their patients. While BMI doesn't measure body fat directly, research has shown that BMI correlates to direct measures of body fat. It is a quick, inexpensive screening method for weight categories that may lead to health problems.
BMI is calculated by dividing a person's weight in kilograms by the square of their height in meters. The formula is: BMI = weight (kg) / height² (m²). For those using imperial measurements, the formula is: BMI = (weight (lbs) / height² (inches)) × 703. This calculator automatically performs this calculation for you based on your inputs. The resulting number places you in one of four categories: underweight (below 18.5), normal weight (18.5-24.9), overweight (25-29.9), or obese (30 and above).
While BMI is a useful screening tool, it does have limitations. It does not directly measure body fat, so athletes with high muscle mass may have a high BMI but not have excess body fat. It also doesn't account for factors like age, sex, ethnicity, and muscle mass. In older adults, loss of muscle mass may cause an underestimation of body fat using BMI. For children and teens, BMI is age and sex-specific. Despite these limitations, BMI remains a widely used indicator of weight-related health risks.
For most adults, checking your BMI every few months is sufficient unless you're actively trying to lose or gain weight. If you're on a weight management program, you might check it monthly to track progress. Remember that daily or weekly fluctuations in weight are normal and often related to hydration levels rather than actual fat changes. It's best to measure under consistent conditions (same time of day, similar clothing) for accurate tracking. BMI should be used as just one indicator of health, alongside other measurements and assessments.
More Health Tools
Explore our comprehensive suite of health calculators and trackers