BMI Calculator

Check your Body Mass Index (BMI) with a simple height and weight input. This tool is designed for general screening only and is not a medical diagnosis.

Calculate Your BMI

Enter your measurements carefully. Metric mode is fully supported now; imperial mode will be added soon.

BMI input fields

Metric mode: enter height in centimeters.

Metric mode: enter weight in kilograms.

Your result

Your BMI result will appear here after calculation.

Disclaimer: BMI is a general screening tool and does not replace medical advice, diagnosis, or treatment.

Understanding BMI

What is BMI?

Body Mass Index (BMI) is a ratio between weight and height. It is commonly used as a screening indicator for adult weight categories.

How is BMI calculated?

Metric formula: BMI = weight (kg) / (height in meters)^2.

Imperial formula: BMI = 703 x weight (lb) / (height in inches)^2.

Standard BMI ranges

  • Underweight: below 18.5
  • Normal weight: 18.5 to 24.9
  • Overweight: 25.0 to 29.9
  • Obesity: 30.0 and above

BMI Calculator FAQ

What is a healthy BMI range?

For most adults, a BMI between 18.5 and 24.9 is generally categorized as normal weight.

Is BMI accurate for everyone?

BMI is useful for screening, but it does not directly measure body fat, muscle mass, or fat distribution.

Can athletes have a high BMI?

Yes. People with higher muscle mass can have a higher BMI while still having a healthy body composition.

Should BMI be used as a medical diagnosis?

No. BMI is a screening metric. Clinical decisions should include medical history and professional evaluation.

How often should I check BMI?

Checking every few weeks or monthly is usually enough for general progress tracking.

What should I track with BMI for better context?

Pair BMI with waist measurements, body fat estimates, and activity or nutrition habits for a more complete picture.