Calculate your Body Mass Index (BMI) based on your height and weight
Body Mass Index (BMI) is a numerical value of your weight in relation to your height. It's commonly used to categorize a person as underweight, normal weight, overweight, or obese.
The BMI formula uses your weight and height to calculate a single number:
BMI is a screening tool, not a diagnostic tool. It doesn't account for muscle mass, bone density, or overall body composition. Athletes might have a high BMI due to increased muscle mass, not excess fat. Always consult with healthcare professionals for proper health assessments.
Understanding your body and health begins with knowing your Body Mass Index (BMI). With the rise of online tools and mobile apps, using a BMI calculator has never been easier. Whether you're tracking fitness progress or checking for potential health risks, BMI is a useful starting point.
BMI, or Body Mass Index, is a numerical value derived from a person's height and weight. It provides a general indicator of whether a person has a healthy body weight for their height.
Using a BMI calculator in kg and cm or an imperial BMI calculator makes it easy to determine this value without doing the math manually.
Using a BMI calculator online is simple:
Many tools today include a BMI calculator with age and gender, offering more tailored feedback. Some advanced tools even combine BMI with body fat estimation for a more complete analysis.
| Category | BMI Range | Health Risk |
|---|---|---|
| Underweight | Less than 18.5 | Higher risk of nutritional deficiencies |
| Normal weight | 18.5 – 24.9 | Lower risk of health issues |
| Overweight | 25.0 – 29.9 | Increased risk of health issues |
| Obese | 30.0 and above | High risk of health issues |
Different BMI charts by age and gender exist for more nuanced evaluation — especially for children and teens, where growth patterns vary.
Women may prefer a BMI tool that considers age and hormonal changes, especially during pregnancy or menopause.
Men can benefit from calculators that account for muscle mass, as a muscular build may inaccurately place them in a higher BMI range.
Growth spurts and development stages mean children and teens need BMI percentiles based on age and gender.
Many calculators now offer personalized health advice, such as diet recommendations or links to fitness plans based on your BMI.
Although widely used, BMI is not a perfect measure. It does not distinguish between fat and muscle mass. For example, athletes with high muscle mass may fall into the "overweight" category despite being in excellent health.
Tracking your BMI over time can help you:
Using a free BMI calculator app or online BMI tracking tool makes it easy to watch your changes over time.
The BMI calculator is a fast, accessible tool for gaining insights into your health. Whether you're using a simple BMI check or a BMI calculator with advanced features, it's a valuable starting point for anyone looking to improve their fitness and well-being.
If you're serious about health tracking, consider pairing BMI with other metrics for a full picture of your body composition.
Try an accurate BMI calculator today — it could be your first step toward a healthier life.