BMI Calculator
BMI Calculator
Calculate your Body Mass Index (BMI) using your height and weight.
BMI Calculator
Our BMI Calculator is a simple and easy-to-use online tool that helps adults calculate their Body Mass Index (BMI) using height and weight. BMI is a commonly used screening measure that compares a person's weight with their height. By entering your weight and height, you can quickly calculate your BMI and see the corresponding standard adult BMI category.
This calculator supports both Metric and Imperial units. You can enter your weight in kilograms and height in centimeters using the Metric option, or enter your weight in pounds and height in feet and inches using the Imperial option.
What Is BMI?
BMI stands for Body Mass Index. It is a numerical value calculated from a person's weight and height. BMI is commonly used as a screening tool to classify weight status in adults. It can help provide a general indication of whether a person's weight falls within a particular range for their height.
BMI does not directly measure body fat and should not be considered a complete assessment of overall health. Factors such as muscle mass, age, sex, body composition, and other health conditions can affect how BMI should be interpreted.
How to Calculate BMI
For adults using metric units, BMI is calculated by dividing weight in kilograms by height in meters squared. The formula is:
BMI = Weight (kg) ÷ Height² (m²)
For example, if a person weighs 70 kg and is 1.75 meters tall, their BMI is approximately 22.9. The calculator performs this calculation automatically, so you do not need to calculate it manually.
BMI Categories for Adults
Standard adult BMI categories commonly classify BMI below 18.5 as Underweight, BMI from 18.5 to 24.9 as Normal Weight, BMI from 25.0 to 29.9 as Overweight, and BMI of 30.0 or higher as Obesity.
These categories are intended for adult screening and should be interpreted in the appropriate clinical context. A BMI value alone cannot determine whether a person is healthy or unhealthy.
How to Use This BMI Calculator
To use the calculator, first select your preferred unit system. If you choose Metric, enter your weight in kilograms and height in centimeters. If you choose Imperial, enter your weight in pounds and height in feet and inches. Then click the Calculate BMI button.
Your BMI value and corresponding category will appear immediately. If you want to perform another calculation, click the Reset button and enter the new measurements.
Why Is BMI Used?
BMI is widely used because it is simple, inexpensive, and easy to calculate. It can be useful when assessing weight status across large groups of adults and can provide a starting point for discussions about weight-related health risks.
However, BMI should not be used by itself to diagnose a disease or determine an individual's overall health. A person with a high amount of muscle, for example, may have a higher BMI without having a high level of body fat.
Who Should Be Careful When Using BMI?
Standard adult BMI categories are not designed to provide the same interpretation for everyone. BMI has limitations for children and teenagers, where age- and sex-specific growth charts are generally used. It also has limitations during pregnancy, because pregnancy-related changes in body weight and composition make standard BMI interpretation inappropriate for assessing pregnancy weight status.
Athletes and people with substantial muscle mass may also have a higher BMI because muscle is relatively dense. Older adults and people with different body compositions may require additional measures and clinical assessment.
Important Information
This BMI Calculator is intended for general informational and educational purposes. It is primarily designed for adults and should not be used as a substitute for professional medical advice, diagnosis, or treatment.
If you are concerned about your weight, nutrition, body composition, or health, consider discussing your individual situation with a qualified healthcare professional. BMI is only one measurement and should be considered alongside other relevant health information.
Frequently Asked Questions
1. What does BMI stand for?
BMI stands for Body Mass Index. It is a numerical value calculated from weight and height and is commonly used as a screening measure for adult weight status.
2. What is a normal BMI?
For adults, a BMI from 18.5 to 24.9 is commonly classified as the standard normal-weight range.
3. What BMI is considered overweight?
For adults, a BMI from 25.0 to 29.9 is commonly classified as overweight.
4. What BMI is considered obesity?
For adults, a BMI of 30.0 or higher is commonly classified as obesity.
5. Can BMI tell how much body fat I have?
No. BMI does not directly measure body fat. It is a screening measure based only on weight and height.
6. Is BMI suitable for children?
Standard adult BMI categories should not be used to interpret BMI in children and teenagers. BMI-for-age is generally interpreted using age- and sex-specific growth references.
7. Is BMI accurate during pregnancy?
Standard adult BMI categories are not intended to assess weight status during pregnancy. Pregnancy weight should be assessed using appropriate clinical guidance.
8. Can muscular people have a high BMI?
Yes. Because BMI uses only height and weight, people with a high amount of muscle mass may have a higher BMI even when their body-fat level is not high.