BMI Calculator

BMI Calculator

A BMI Calculator helps you quickly estimate your Body Mass Index (BMI) using your height and weight. BMI is a simple screening measure that shows whether an adult's weight falls within the underweight, healthy-weight, overweight, or obesity range.

How to Calculate BMI

BMI is calculated using your weight and height:

BMI = Weight (kg) ÷ Height (m)²

For example, if you weigh 70 kg and your height is 1.75 m, your BMI is approximately 22.9.

If you use pounds and inches, the formula is:

BMI = (Weight in lb × 703) ÷ Height in inches²

Our BMI calculator makes this calculation simple. Just enter your height and weight to get your BMI result instantly.

BMI Categories for Adults

For most adults, BMI is generally classified as:

  • Below 18.5: Underweight
  • 18.5–24.9: Healthy weight
  • 25–29.9: Overweight
  • 30 or above: Obesity

These ranges are useful for screening, but BMI does not directly measure body fat or overall health.

What Are the Limitations of BMI?

BMI cannot distinguish between muscle and fat. For example, someone with a high amount of muscle may have a higher BMI without having excess body fat. BMI also does not show where body fat is stored.

For a broader assessment, measurements such as waist circumference and other health factors may be considered.

You can also explore our Ideal Weight Calculator to get another useful estimate based on your height.

BMI Calculator for Children

Adult BMI categories should not be used for children and teenagers in the same way. For younger people, BMI is interpreted according to age and sex using growth charts.

For more information about BMI and healthy weight, you can refer to the CDC's BMI information.

Final Thoughts

A BMI Calculator is a convenient way to check your BMI and understand your general weight category. However, BMI is only a screening tool, not a medical diagnosis. For personalized health advice, speak with a qualified healthcare professional.

Medical Disclaimer: This calculator and article are provided for general educational purposes and should not be considered medical advice.

Frequently Asked Questions FAQ

What is BMI?
Body Mass Index (BMI) is a numerical value derived from an individual's weight and height. It is used as a screening tool to categorize body weight into different categories, such as underweight, normal weight, overweight, and obesity. BMI helps assess potential health risks associated with different levels of body fat.
How is BMI Calculated?
BMI is calculated using the following formulas: Metric System: BMI=Weight (kg)Height (m)2BMI= Height (m) 2Weight (kg) ​ Imperial System: BMI=Weight (lb)×703Height (in)2BMI= Height (in) 2Weight (lb)×703 ​ For example, if you weigh 70 kg and are 1.75 meters tall, your BMI would be: BMI=701.752≈22.86BMI= 1.75 270≈22.86
What Do BMI Categories Mean?
BMI categories are used to interpret the results and identify potential health risks. The categories are: Underweight: BMI less than 18.5 Normal weight: BMI 18.5 to 24.9 Overweight: BMI 25 to 29.9 Obesity: Class 1: BMI 30 to 34.9 Class 2: BMI 35 to 39.9 Class 3: BMI 40 and above
15. How Can I Calculate My BMI Online?
Many websites and apps offer BMI calculators that allow you to input your weight and height to quickly compute your BMI. Ensure you use a reputable source and follow the instructions carefully to obtain accurate results.

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