BMI Calculator
Use our free tool to check your Body Mass Index and understand your health status.
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Body Mass Index (BMI) is a simple calculation using a person's height and weight. The formula is BMI = kg/m² where kg is a person's weight in kilograms and m² is their height in meters squared.
A BMI of 25.0 or more is overweight, while the healthy range is 18.5 to 24.9. BMI applies to most adults 18-65 years.
Knowing your BMI is a good way to check if you're at a healthy weight. Being overweight can increase your risk of heart disease, stroke, and type 2 diabetes.
However, BMI doesn't measure body fat directly. Some people, such as muscular athletes, may have a BMI in the "obese" category even though they don't have excess body fat.
Frequently Asked Questions
For most adults, a BMI between 18.5 and 24.9 is considered within the healthy weight range. Below 18.5 is underweight, 25.0 to 29.9 is overweight, and 30.0 or higher falls within the obesity range.
No. BMI is a screening tool, not a diagnostic of body fatness or health. It does not distinguish between excess fat, muscle, or bone mass. Athletes with high muscle mass may have a high BMI but not have high body fat.
If your BMI is outside the healthy range, consult with a healthcare provider. They can perform further assessments, such as skinfold thickness measurements or diet evaluations, to better understand your health status.