Enter your height and weight to calculate your BMI:
Result
Calculate your Body Mass Index quickly and accurately.
Enter your height and weight to calculate your BMI:
The BMI Calculator Tool is an essential health utility that allows you to determine your Body Mass Index (BMI) quickly and easily. BMI is a simple numerical measure that is frequently used by healthcare professionals and individuals alike to categorize a person's weight status relative to their height. It is a key indicator for assessing potential health risks associated with being underweight, having a healthy weight, being overweight, or living with obesity.
Using this free online BMI tool is the first step toward understanding your current body composition and setting realistic health and fitness goals. Simply input your height and weight, and the calculator will instantly provide your BMI score and corresponding weight category.
The BMI formula is a straightforward mathematical equation that relates a person’s weight to the square of their height. Understanding the calculation provides clarity on the resulting score. The formula varies slightly depending on whether you are using the metric system or the imperial system:
Metric BMI Formula: BMI = weight (kg) / [height (m)]${^2}$
Example: A person weighing 70 kg and 1.75 m tall has a BMI of $70 / (1.75 * 1.75) \approx 22.86$.
Imperial BMI Formula: BMI = [weight (lbs) / [height (in)]${^2}$] $\times$ 703
This conversion factor (703) ensures the result aligns with the metric-derived BMI score.
Our online BMI calculator handles all these complex conversions automatically, ensuring you get an accurate result whether you input your measurements in kilograms and meters or pounds and inches.
Once you calculate your BMI score, it falls into one of four primary weight status categories defined by the World Health Organization (WHO) and widely adopted by health institutions globally. These categories help indicate if your weight might be increasing your risk for certain chronic diseases.
Underweight: BMI below 18.5
A BMI in this range suggests that you may not be carrying enough weight, which can also pose health risks.
Healthy Weight: BMI between 18.5 and 24.9
This is generally considered the healthy weight range associated with the lowest health risk.
Overweight: BMI between 25.0 and 29.9
A BMI in this category often indicates a need for weight management to prevent future health complications.
Obese (Class I, II, & III): BMI of 30.0 or higher
This level of BMI is associated with significantly increased risks for conditions like Type 2 diabetes, heart disease, and hypertension.
Monitoring your Body Mass Index is a crucial, non-invasive first step in proactive health management. The benefits of using a BMI tool regularly are significant:
Initial Health Assessment: Provides a quick and simple measure to assess whether you are in a healthy weight range.
Risk Identification: Helps identify potential health risks associated with being overweight or obese (e.g., cardiovascular disease, stroke, diabetes).
Tracking Progress: Excellent for tracking changes in your body composition as you implement a diet plan or exercise routine.
Motivational Tool: Seeing your BMI score change can serve as a powerful motivator to maintain a healthier lifestyle.
While the BMI calculation is an excellent general screening tool for the public, remember that it is not a perfect diagnostic measure. It doesn't account for muscle mass or body fat distribution. Consult a healthcare provider for a comprehensive assessment of your overall health.