A healthy weight is a weight that lowers your risk for health problems. For most people, body mass index (BMI) provides a reasonable estimate. However, BMI doesn't directly measure body fat and may not account for muscle mass, bone density, and other factors.

BMI is calculated by dividing your weight in kilograms by the square of your height in meters. The formula is: BMI = kg/m². Our calculator does this automatically using your height and weight inputs.

For most adults, a healthy BMI is in the 18.5 to 24.9 range. Below 18.5 is considered underweight, 25 to 29.9 is overweight, and 30 or above is considered obese. These ranges may vary slightly based on ethnicity and body composition.

BMI may overestimate body fat in athletes and others with muscular builds because muscle weighs more than fat. If you're very muscular, your BMI may be in the overweight range even if you have little body fat. Consult a health professional for more accurate assessments.

The BMI calculation is the same for both men and women. However, women naturally tend to have more body fat than men at the same BMI. Our calculator takes gender into account when determining healthy weight ranges.