BMI Calculator Online Free
Use this free BMI calculator to calculate your body mass index from height and weight. Enter your height in centimeters and weight in kilograms to check your BMI category instantly.
Free BMI Calculator by Height and Weight
This free online BMI calculator helps you calculate body mass index using your height and weight. It is useful for quickly checking whether your BMI falls into an underweight, healthy weight, overweight, or obesity category.
BMI stands for Body Mass Index. It is calculated by dividing weight in kilograms by height in meters squared. This calculator uses centimeters and kilograms, so you can enter simple metric values and get your BMI result instantly.
How to Calculate BMI Online
- Enter your height in centimeters.
- Enter your weight in kilograms.
- Click the Calculate BMI button.
- View your BMI score and weight category.
- Use Clear All to reset the calculator.
BMI Categories for Adults
| BMI Range | Category |
|---|---|
| Below 18.5 | Underweight |
| 18.5 to 24.9 | Healthy weight |
| 25 to 29.9 | Overweight |
| 30 or higher | Obesity |
Note: BMI is a general screening tool for adults. It does not measure body fat directly and should not replace medical advice.
Why Use a BMI Calculator?
- • Calculate BMI online for free
- • Check BMI using height and weight
- • Find your BMI category instantly
- • Useful for fitness tracking and personal reference
- • Works with centimeters and kilograms
- • Fast, simple, and browser-based calculator
BMI Calculator for Adults
This BMI calculator is designed for general adult BMI calculation. For children and teens, BMI is usually interpreted differently using age and sex percentiles. If you are checking BMI for a child, teen, athlete, pregnant person, or someone with a medical condition, it is best to speak with a healthcare professional.
BMI can be helpful as a quick reference, but it does not show muscle mass, body composition, waist measurement, or overall health status. Use it as a simple starting point, not as a complete health diagnosis.
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FAQ
How do I calculate BMI online?
Enter your height in centimeters and weight in kilograms, then click Calculate BMI to see your result.
Is this BMI calculator free?
Yes, this BMI calculator is completely free to use.
What is a healthy BMI range?
For adults, a BMI between 18.5 and 24.9 is commonly considered a healthy weight range.
Can BMI tell my exact health status?
No. BMI is only a general screening tool and does not replace medical advice or a complete health assessment.
Does BMI work for athletes?
BMI may not be accurate for athletes or people with high muscle mass because it does not separate muscle from fat.
Can children use this BMI calculator?
This calculator is mainly for adults. Children and teens usually need BMI-for-age percentile calculations.