BMI Calculator

Unit System

Metric (kg, cm)Imperial (lbs, inches)

Weight (kg)*

Height (cm)*

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What is BMI?

BMI (Body Mass Index) is a measure of body fat based on height and weight that applies to adult men and women. It's a simple calculation that helps determine if you're at a healthy weight for your height.

BMI is calculated by dividing your weight in kilograms by the square of your height in meters. While BMI doesn't directly measure body fat, it's a useful screening tool to identify potential weight problems.

Advantages of Using Our BMI Calculator

✓Instant Results: Get your BMI calculated instantly with just two inputs
✓Dual Unit Support: Works with both metric (kg, cm) and imperial (lbs, inches) units
✓Accurate Calculations: Uses the standard BMI formula recommended by health organizations
✓Visual BMI Chart: See where you fall on the BMI scale with our visual indicator
✓Free & Private: No registration required, all calculations are done locally
✓Mobile Friendly: Works perfectly on all devices - desktop, tablet, and mobile

How to Use the BMI Calculator

1
Select Your Unit SystemChoose between Metric (kilograms and centimeters) or Imperial (pounds and inches) based on your preference.
2
Enter Your WeightInput your current weight in the selected unit system. Make sure to use accurate measurements for best results.
3
Enter Your HeightInput your height. For metric, enter in centimeters; for imperial, enter in inches.
4
Click CalculatePress the "Calculate BMI" button to get your Body Mass Index and category instantly.

Understanding BMI Categories

Underweight: BMI < 18.5

You may need to gain weight. Consult with a healthcare provider for guidance.

Normal Weight: BMI 18.5 - 24.9

Congratulations! You're within a healthy weight range for your height.

Overweight: BMI 25 - 29.9

You may want to consider losing weight for better health outcomes.

Obese: BMI ≥ 30

It's recommended to consult with a healthcare provider about weight management strategies.

BMI Limitations

While BMI is a useful screening tool, it has limitations:

BMI doesn't distinguish between muscle and fat mass
Athletes with high muscle mass may have a higher BMI despite being healthy
BMI may not be accurate for elderly individuals or those with reduced muscle mass
It doesn't account for body fat distribution

For a complete health assessment, consult with a healthcare professional who can consider additional factors like body composition, medical history, and lifestyle.

Frequently Asked Questions

What is a healthy BMI range?

A healthy BMI typically falls between 18.5 and 24.9. This range is associated with the lowest risk of health problems related to weight.

Is BMI accurate for everyone?

BMI is a general screening tool but may not be accurate for everyone. It doesn't account for muscle mass, bone density, or body fat distribution. Athletes and elderly individuals may get misleading results.

How often should I check my BMI?

There's no set frequency, but checking monthly can help you track changes over time. Remember that BMI is just one indicator of health and should be used alongside other health metrics.

Can BMI be different for men and women?

The BMI formula is the same for both men and women, but the interpretation may vary slightly. Women naturally have higher body fat percentages than men at the same BMI level.

What should I do if my BMI is outside the normal range?

If your BMI is outside the normal range, consult with a healthcare provider or registered dietitian. They can help you develop a personalized plan that considers your overall health, lifestyle, and goals.