BMI Calculator

Calculate your Body Mass Index (BMI) and get personalized health insights to understand if you're at a healthy weight

Your Measurements

Enter your weight in kilograms (e.g., 70.5)

Enter your height in centimeters (e.g., 170)

Understanding BMI (Body Mass Index)

What is BMI?

BMI (Body Mass Index) is a simple calculation using a person's height and weight. The formula is: BMI = weight (kg) / [height (m)]². According to the CDC, BMI is used to categorize individuals into weight categories that may lead to health problems. The World Health Organization recognizes BMI as a useful screening tool for weight categories.

BMI Categories (WHO)

  • Under 18.5:Underweight
  • 18.5 - 24.9:Normal weight
  • 25.0 - 29.9:Overweight
  • 30.0 - 34.9:Obese Class I
  • 35.0 - 39.9:Obese Class II
  • 40.0 and above:Obese Class III

Important Notes

BMI Limitations

BMI doesn't distinguish between muscle and fat mass. Athletes and bodybuilders may have high BMI due to muscle mass, not excess fat. As noted by the National Heart, Lung, and Blood Institute, BMI also doesn't account for age, gender, or body composition differences.

When to See a Doctor

Consult a healthcare provider if your BMI is outside the normal range, or if you have concerns about your weight. The Mayo Clinic recommends additional assessments like body fat percentage, waist circumference, and other health markers.

Other Health Indicators

Consider other metrics like waist-to-hip ratio, body fat percentage, muscle mass, blood pressure, cholesterol levels, and blood sugar for a complete health picture.

Scientific References & Resources

American Heart Association: BMI in Adults

Information on BMI and cardiovascular health

National Institute of Diabetes: Weight Management

Comprehensive weight and obesity information

Harvard Health: Can BMI Be Trusted?

Critical analysis of BMI limitations

MedlinePlus: Body Mass Index

Medical encyclopedia entry on BMI

Medical Disclaimer

This BMI calculator is for informational purposes only and 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 or weight management plan. For additional guidance, visit MyHealthfinder (U.S. Department of Health & Human Services).

Important Disclaimer

General Information Only: This calculator provides estimates based on publicly available information and standard rates. Results are for informational and educational purposes only and should not be considered as professional financial, legal, or tax advice.

Accuracy and Updates: While we strive to maintain accurate and up-to-date information using official sources including Kenya Revenue Authority (KRA), National Social Security Fund (NSSF), Social Health Insurance Fund (SHIF), and other relevant government agencies, rates and regulations may change. Always verify current rates with official sources.

Seek Professional Advice: For specific tax planning, salary negotiations, financial decisions, or legal matters, please consult with qualified professionals such as certified accountants, tax advisors, financial planners, or legal practitioners who can consider your individual circumstances.

No Liability: Top Calculator and its operators accept no liability for any loss, damage, or inconvenience arising from the use of this calculator or reliance on its results. Users are responsible for verifying all calculations and information with official sources before making financial decisions.

Official Sources: For authoritative information, please refer to:

Last updated: January 2025. This disclaimer applies to all calculators on Top Calculator.