Calculate your Body Mass Index instantly. Find out if you are underweight, normal weight, overweight, or obese based on your height and weight.
A BMI Calculator computes your Body Mass Index, a simple screening measure based on height and weight used to broadly categorize whether a person is underweight, normal weight, overweight, or obese.
BMI equals weight in kilograms divided by height in meters squared. For imperial units, BMI equals weight in pounds divided by height in inches squared, multiplied by 703.
Enter your weight. Enter your height. Click Calculate to see your BMI value and corresponding weight category.
Example 1: A person weighing 70 kg at 1.75 meters tall has a BMI of approximately 22.9, within the normal weight range.
Example 2: A person weighing 90 kg at the same height has a BMI of approximately 29.4, in the overweight category.
Quick general health screening as part of a checkup. Tracking weight related changes over time. Setting weight management goals alongside other health metrics. Comparing population health trends in research and public health studies.
Is BMI an accurate measure of health for everyone. No, BMI does not account for muscle mass, bone density, or fat distribution, so it can be misleading for athletes or certain body types.
What are the standard BMI categories. Generally under 18.5 is underweight, 18.5 to 24.9 is normal, 25 to 29.9 is overweight, and 30 or above is obese.
Does BMI differ for children. Yes, children and teens use age and gender specific BMI percentile charts rather than the standard adult categories.
Can a muscular person have a high BMI but still be healthy. Yes, since muscle weighs more than fat, athletes can have a high BMI while having low body fat.
Should BMI be the only health metric I track. No, it works best alongside other measures like waist circumference, body fat percentage, and overall fitness level.