BMI Calculator
Calculate your Body Mass Index (BMI) with metric or imperial units. See your BMI category and visual scale.
About BMI Calculator
Our free BMI Calculator helps you determine your Body Mass Index — a widely used screening tool to categorize weight status. BMI is calculated by dividing your weight by the square of your height and provides a general indication of whether you're underweight, at a healthy weight, overweight, or obese.
This calculator supports both metric (kilograms and centimeters) and imperial (pounds, feet, and inches) units, making it convenient for users worldwide. The visual BMI scale gives you an immediate understanding of where your BMI falls within the standard categories established by the World Health Organization.
Please note that BMI is a screening tool and does not directly measure body fat or health. It doesn't account for muscle mass, bone density, age, sex, or body composition. For a comprehensive health assessment, consult a healthcare professional.
Frequently Asked Questions
Q What is a healthy BMI range?
According to the World Health Organization, a healthy BMI range is between 18.5 and 24.9. Below 18.5 is considered underweight, 25 to 29.9 is overweight, and 30 or above is classified as obese. These ranges apply to adults and may differ for children and teens.
Q Is BMI accurate for everyone?
BMI is a useful screening tool but has limitations. It doesn't distinguish between muscle and fat mass, so athletes with high muscle mass may have a high BMI despite being healthy. It also doesn't account for age, sex, ethnicity, or body fat distribution. It's best used as a starting point rather than a definitive health measure.
Q How is BMI calculated?
BMI is calculated as weight (in kilograms) divided by height (in meters) squared: BMI = kg/m². For imperial units, the formula is: BMI = (lbs × 703) / (inches²). Our calculator handles both unit systems automatically.