Calculate your Body Mass Index (BMI), understand your weight category, and get personalized health recommendations based on WHO standards.
A Body Mass Index (BMI) calculator measures your body fat based on height and weight that applies to adult men and women. BMI is a screening tool to identify whether you're underweight, normal weight, overweight, or obese. While not a diagnostic tool for body fatness or health, BMI is widely used by healthcare professionals as a quick assessment method. It provides a reliable indicator for most people to understand their weight category and potential health risks associated with being over or underweight.
Track your weight loss or gain progress objectively with scientifically-backed measurements used by doctors worldwide. Set realistic fitness goals based on your BMI category, understand health risks associated with your current weight, and monitor changes over time. Whether you're working with a nutritionist, starting a fitness program, or managing medical conditions like diabetes or heart disease, BMI provides a standardized metric for tracking progress. Free, instant, and clinically accurate calculations help millions make informed health decisions daily.
Select your measurement system (metric or imperial), enter your height and current weight, then click calculate. Results show your BMI number, weight category (underweight, normal, overweight, obese), and health insights. For accuracy, measure your weight in the morning before eating, and ensure height measurements are precise. Track your BMI monthly to see trends rather than focusing on daily fluctuations. Remember that BMI doesn't account for muscle mass, so athletes may show higher numbers despite being healthy.
Using the BMI calculator is straightforward. First, select your preferred measurement system - metric (kilograms and centimeters) or imperial (pounds and feet/inches). Enter your current weight accurately; for best results, weigh yourself in the morning after using the bathroom, before eating, and wearing minimal clothing. Next, enter your height precisely - stand straight against a wall without shoes for an accurate measurement. Click calculate to instantly see your BMI score along with your weight category (underweight, normal, overweight, or obese) based on WHO standards. The calculator also provides personalized health insights based on your results. For ongoing health monitoring, bookmark this page and recalculate monthly to track changes. Remember that BMI is a screening tool, not a diagnostic measure - athletes with high muscle mass may show elevated BMI despite being healthy.
BMI is calculated by dividing your weight by the square of your height. The formula works the same regardless of whether you use metric or imperial units, though the units must be consistent.
BMI = weight (kg) / height² (m²)BMI= Body Mass Index scoreweight= Body weight in kilogramsheight²= Height in meters, squaredScenario: John is 5 feet 10 inches (1.78 meters) tall and weighs 180 pounds (81.6 kg). He wants to know his BMI category.
Result: John's BMI is 25.76, placing him in the "Overweight" category (25.0-29.9). According to WHO guidelines, he would benefit from losing 5-10 pounds to reach the "Normal" range (18.5-24.9). A target weight of 170 lbs would give him a BMI of 24.4, within the healthy range.
Calculate realistic BMI change timeline, weight loss goals, and sustainable path to your target weight with personalized weekly milestones.
Calculate body fat percentage using Navy method, get health risk assessment, and visualize your body composition with personalized recommendations.
Calculate daily calorie needs based on your profile
Calculate your daily protein needs based on weight, activity level, and fitness goals for optimal muscle growth and health.
Calculate your personalized daily water intake based on weight, activity level, climate, and health factors for optimal hydration.
Calculate daily calorie needs based on your profile
Calculate your exact age in years, months, days, hours, and minutes from your birth date with precise leap year accounting.
Calculate your personalized daily water intake based on weight, activity level, climate, and health factors for optimal hydration.
Calculate realistic BMI change timeline, weight loss goals, and sustainable path to your target weight with personalized weekly milestones.
Calculate your accumulated sleep debt and get personalized recovery recommendations for better health and cognitive performance.
Calculate body fat percentage using Navy method, get health risk assessment, and visualize your body composition with personalized recommendations.
Common questions about bmi calculator (body mass index)
New calculators & tax rate updates
Get notified when we add new calculators or update tax rates. No spam — just useful updates for your financial planning.
We respect your privacy. Unsubscribe anytime.