BMI Calculator
Calculate your Body Mass Index (BMI) to determine if you are at a healthy weight for your height.
What is BMI?
Body Mass Index (BMI) is a person's weight in kilograms divided by the square of height in meters. BMI is an inexpensive and easy screening method for weight category—underweight, healthy weight, overweight, and obesity.
How is BMI calculated?
Metric Formula: BMI = weight (kg) / [height (m)]²
Imperial Formula: BMI = 703 × weight (lbs) / [height (in)]²
BMI Categories
- Underweight: BMI is less than 18.5
- Normal weight: BMI is 18.5 to 24.9
- Overweight: BMI is 25 to 29.9
- Obesity: BMI is 30 or higher
Limitations of BMI
While BMI is a useful screening tool, it does not measure body fat directly. It may overestimate body fat in athletes and others who have a muscular build. It may underestimate body fat in older persons and others who have lost muscle. It also doesn't account for the distribution of fat, which is an important factor in health risks.
How to use this tool
- Select your preferred measurement system (Metric or Imperial).
- Enter your weight.
- Enter your height.
- Click the "Calculate BMI" button.
- View your BMI value and category in the results section.
Why use our BMI Calculator?
Knowing your BMI can help you understand your general health status and whether you are at risk for certain health conditions associated with being underweight, overweight, or obese. It's a quick and easy screening tool used by healthcare professionals worldwide.
Frequently Asked Questions
What is BMI?
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 metres squared. A BMI of 25.0 or more is overweight, while the healthy range is 18.5 to 24.9.
How accurate is BMI?
BMI is a useful screening tool for most people, but it has limitations. It may overestimate body fat in athletes and others who have a muscular build. It may underestimate body fat in older persons and others who have lost muscle. It should not be used as a diagnostic tool.
What is a healthy BMI?
A healthy BMI for adults is generally considered to be between 18.5 and 24.9. However, what is considered "healthy" can vary depending on individual factors such as age, sex, and muscle mass.
Is BMI different for men and women?
The standard BMI formula and categories are the same for adult men and women. However, women tend to have more body fat than men at the same BMI, and older people tend to have more body fat than younger adults at the same BMI.
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