BMI Calculator
Calculate your Body Mass Index and discover your weight category using metric or imperial units.
What is BMI Calculator?
A BMI (Body Mass Index) Calculator is a simple tool that estimates body fat based on your height and weight. It provides a quick screening method to categorize individuals as underweight, normal weight, overweight, or obese. While BMI does not directly measure body fat, it is widely used by health professionals as an initial assessment of weight status.
BMI Prime and Ponderal Index are additional metrics that offer alternative perspectives on body composition. BMI Prime compares your BMI to the upper limit of the normal range, while the Ponderal Index adjusts weight for height in a way that is less sensitive to height variations than BMI.
How to Use
- Select your preferred unit system: Metric (centimeters and kilograms) or Imperial (feet, inches, and pounds).
- Enter your height and weight into the corresponding fields.
- Click Calculate BMI to see your BMI, category, healthy weight range, BMI Prime, and Ponderal Index.
- Use the color gauge bar to visualize where your BMI falls across the standard categories.
Frequently Asked Questions
What is a healthy BMI range?
A healthy BMI for most adults is between 18.5 and 24.9. Below 18.5 is considered underweight, 25 to 29.9 is overweight, and 30 or above is obese.
Is BMI accurate for everyone?
BMI is a useful screening tool but does not account for muscle mass, bone density, or fat distribution. Athletes with high muscle mass may have a higher BMI without excess body fat.
What does BMI Prime mean?
BMI Prime is your BMI divided by 25 (the upper limit of the healthy range). A value of 1.0 means you are at the top of the healthy range; values above 1.0 indicate overweight status.
Can I use this calculator for children?
This calculator is designed for adults. For children and teens, BMI is interpreted using age- and sex-specific percentiles rather than fixed categories.