Free BMI calculator using WHO standards. Calculate your Body Mass Index instantly and see your weight category with personalized health insights.
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BMI is a simple screening tool used worldwide to categorize weight status. While not a diagnostic measure, it provides a quick assessment that can indicate whether your weight might be affecting your health. Calculate your BMI instantly and understand what it means for you.
Body Mass Index (BMI) is a numerical value calculated from your weight and height. Developed by Belgian mathematician Adolphe Quetelet in the 1830s, it's used by healthcare providers as a screening tool to identify potential weight problems. BMI categories include underweight (below 18.5), normal weight (18.5-24.9), overweight (25-29.9), and obese (30 and above). While useful for population studies, individual assessment should consider factors like muscle mass, age, and ethnicity.
BMI Formula
BMI = Weight (kg) / Height² (m²)Get a quick snapshot of whether your weight falls within a healthy range for your height.
Monitor changes over time as you work toward your health and fitness goals.
Have more productive discussions with healthcare providers about weight management.
Know your BMI before doctor visits to facilitate discussions about weight-related health.
Set realistic targets and track your progress toward a healthy weight range.
Many insurance policies use BMI as one factor in determining coverage and rates.
Participate in health studies that use BMI as a standardized measurement.
BMI is a screening tool, not a diagnostic measure. It doesn't account for muscle mass, bone density, age, gender, or fat distribution. Athletes may have high BMI due to muscle, while some with normal BMI may have unhealthy body fat levels. Use it as one data point, not the complete picture.