BMI Calculator

Calculate your Body Mass Index (BMI) with any combination of units.

Height

Weight

Your BMI Result

Underweight
<18.5

Normal
18.5-24.9

Overweight
25-29.9

Obese
>30

Enter your details and click calculate to see your results.

Understanding Your Body Metrics

Health is a journey, and every journey needs a starting point. The Body Mass Index (BMI) is a widely used screening tool that helps you understand if your weight is in a healthy proportion to your height.

While BMI isn't a complete picture of health (it doesn't distinguish between muscle and fat), it’s a vital "first glance" metric used by doctors and health professionals worldwide to identify potential weight-related risks. (Read our deep dive on BMI vs. Body Fat Percentage). At Sellooo, we make it easy to track this metric with total privacy.

How to Calculate Your BMI

Select Your Unit System: Choose between Metric (kg/cm) or Imperial (lbs/inches).
Input Your Height and Weight: Be as accurate as possible for the best results.
View Your Result: Our calculator will give you your score and categorize it according to WHO (World Health Organization) standards instantly.

What Your BMI Score Means

Below 18.5: Underweight. You may need to consult a nutritionist.
18.5 – 24.9: Healthy Weight. This is generally considered the optimal range.
25.0 – 29.9: Overweight. You might be at an increased risk for certain conditions.
30.0 and Above: Obese. Talk to a healthcare provider about weight management.

Practical Use Cases for BMI Calculation

Every day, health-conscious individuals and professionals rely on our tool to assess body composition.

Health Screenings

Doctors use BMI as an initial screening tool to identify potential weight-related health risks.

Fitness Progress

Track changes in your BMI over time as you navigate your fitness and diet journey.

Insurance

Many insurance companies use BMI ranges to determine premium rates and policy eligibility.

Goal Setting

Use the healthy BMI range to set realistic and sustainable weight goals for the long term.

The Limitations of BMI

From our experience helping users track their health, we always emphasize one thing: BMI is a tool, not a diagnosis.

Muscle Mass: Athletes and bodybuilders often have a "high BMI" because muscle weighs more than fat. They aren't "overweight" in a health sense.
Age and Gender: BMI doesn't account for where you carry your weight or your bone density, which changes as you age.
Ethnic Differences: Some populations have different risk thresholds for health issues at different BMI levels.

Medical Disclaimer

This tool provides information for educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read on this website.

Frequently Asked Questions

The formula is the same, but the way fat is distributed can differ. However, the standard WHO categories apply to both genders as a general screening tool.

No, children and teens need a "BMI-for-age" percentile chart which accounts for growth and developmental stages.

In metric units, it is weight (kg) / [height (m)]². In imperial, it is 703 x weight (lbs) / [height (in)]².

Once a month is usually sufficient for tracking long-term progress without obsessing over daily weight fluctuations.

Yes! Sellooo does not store your numbers. The calculation happens locally in your browser, and the data is purged when you close the tab.

Explore More Health & Fitness Tools

Looking for more ways to understand your body? Check out our BMR Calculator, TDEE Calculator, or Ideal Weight Calculator.