BMI Calculator Online – Free Body Mass Index Calculator.

A BMI Calculator is an online tool that estimates your Body Mass Index using your height and weight. BMI is calculated by dividing your weight in kilograms by your height in meters squared.

For example, if an adult weighs 70 kg and is 1.75 meters tall, the BMI is calculated as 70 ÷ (1.75 × 1.75), which is approximately 22.86.

This value falls within the standard adult normal-weight BMI range. BMI is a screening tool and should not be treated as a complete assessment of an individual's health.

To calculate BMI using metric measurements, divide your weight in kilograms by your height in meters multiplied by itself.

Formula: BMI = Weight (kg) ÷ Height (m)².

For example, a person who weighs 65 kg and is 1.70 meters tall has a BMI of 65 ÷ (1.70 × 1.70), which is approximately 22.49.

Enter your height and weight in the BMI Calculator above to calculate your result automatically.

For adults aged 20 and older, a BMI from 18.5 to less than 25 is generally classified as normal weight under standard BMI categories.

A BMI below 18.5 is classified as underweight, 25 to less than 30 as overweight, and 30 or above as obesity.

These categories are screening guidelines rather than individual diagnoses. Age, muscle mass, pregnancy and other health factors can affect how BMI should be interpreted.

Your BMI score places your height-to-weight ratio into a standard screening category. For adults, a result below 18.5 is classified as underweight, 18.5 to less than 25 as normal weight, 25 to less than 30 as overweight, and 30 or above as obesity.

However, BMI cannot tell you exactly how much body fat you have or where fat is distributed. It also does not directly measure fitness, nutrition or overall health.

If you have concerns about your weight or health, consult a qualified healthcare professional for an assessment based on your individual circumstances.

Yes. This BMI Calculator supports height in feet and inches and weight in pounds. Select the appropriate measurement units, enter your height and weight, and click Calculate BMI.

The calculator converts the measurements internally and applies the standard BMI formula. You do not need to convert feet, inches or pounds to metric units manually.

You can also use centimeters and kilograms if you prefer metric measurements.

BMI is a useful screening measure for many adults, but it does not provide a complete picture of health. It does not directly distinguish body fat from muscle, bone or other tissues.

For example, a muscular person may have a higher BMI without having excessive body fat. BMI also requires special interpretation during pregnancy and is assessed differently in children and teenagers.

For these reasons, BMI should be considered alongside other relevant health information rather than used as a standalone diagnosis.

Yes. This online BMI Calculator is designed to be free to use. You do not need to create an account, register or install a separate application.

Simply enter your height and weight, choose the correct measurement units and click Calculate BMI to see your result.

The calculation runs locally in your browser. The calculator code does not send your entered height or weight to a calculation server, although separate website services may have their own data practices.

Children and teenagers should not be assessed using the standard adult BMI categories alone. Their BMI is interpreted using age- and sex-specific growth charts because body composition changes as they grow.

A child's BMI result should be assessed using appropriate pediatric guidance by a qualified healthcare professional.

This calculator displays standard adult BMI categories and is intended for adults aged 20 and older.