What Is BMI and Why Is It Important?
Body mass index (BMI) calculation is a widely used method that evaluates the relationship between your weight and height to help identify potential health risks early. Also known as a height–weight calculation, BMI provides a useful starting point for identifying risks related to overweight, obesity, or undernutrition.
A BMI below 18.5 is classified as underweight, values between 18.5 and 24.9 are considered normal weight, values between 25 and 29.9 indicate overweight, and values above 30 are classified as obesity. In adults over the age of 65, these thresholds may be interpreted slightly differently.
Our BMI calculator uses your height and weight to instantly calculate your body mass index. It also provides a personalized evaluation based on your age and sex, shows your ideal weight range, and helps identify your obesity risk.
BMI Calculator – Body Mass Index
This calculator is for informational purposes only. BMI alone does not fully reflect your health status. Please consult your doctor for a thorough evaluation.
How Is BMI Calculated?
The BMI formula is simple. Your weight (in kilograms) is divided by the square of your height (in meters).
For example, a person who weighs 70 kilograms and is 1.70 meters tall would have a BMI calculated as:
70 ÷ 2.89 = 24.2
This result falls within the normal weight range.
You do not need to perform this calculation manually. By entering your height, weight, age, and sex into the BMI calculator above, you can instantly see your BMI value and your recommended weight range.
How Should I Interpret My BMI Result?
Although BMI is a useful tool for assessing obesity risk, it should not be used as the only measurement. In individuals with high muscle mass—such as athletes—the height–weight ratio may be misleading.
A more accurate assessment of health risk should also consider waist circumference, body fat percentage, and overall health status. For this reason, it is recommended to review your results with a healthcare professional for a more comprehensive evaluation.